/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hdfs;

import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_DEFAULT_NAME_KEY;
import static org.hamcrest.CoreMatchers.allOf;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.security.PrivilegedExceptionAction;
import java.util.List;
import java.util.Scanner;

import com.google.common.base.Supplier;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.QuotaUsage;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.client.impl.LeaseRenewer;
import org.apache.hadoop.hdfs.protocol.DSQuotaExceededException;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.NSQuotaExceededException;
import org.apache.hadoop.hdfs.protocol.QuotaByStorageTypeExceededException;
import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
import org.apache.hadoop.hdfs.server.namenode.FSImageTestUtil;
import org.apache.hadoop.hdfs.tools.DFSAdmin;
import org.apache.hadoop.hdfs.web.WebHdfsConstants;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.test.PathUtils;
import org.apache.hadoop.util.ToolRunner;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;

import com.google.common.base.Charsets;
import com.google.common.collect.Lists;
import org.junit.rules.Timeout;
import org.slf4j.Logger;
import org.slf4j.event.Level;
import org.slf4j.LoggerFactory;

/** A class for testing quota-related commands */
public class TestQuota {

  private static final Logger LOG = LoggerFactory.getLogger(TestQuota.class);
  
  private static Configuration conf = null;
  private static final ByteArrayOutputStream OUT_STREAM = new ByteArrayOutputStream();
  private static final ByteArrayOutputStream ERR_STREAM = new ByteArrayOutputStream();
  private static final PrintStream OLD_OUT = System.out;
  private static final PrintStream OLD_ERR = System.err;
  private static MiniDFSCluster cluster;
  private static DistributedFileSystem dfs;
  private static FileSystem webhdfs;
  /* set a smaller block size so that we can test with smaller space quotas */
  private static final int DEFAULT_BLOCK_SIZE = 512;

  @Rule
  public final Timeout testTestout = new Timeout(120000);

  @BeforeClass
  public static void setUpClass() throws Exception {
    conf = new HdfsConfiguration();
    conf.set(
        MiniDFSCluster.HDFS_MINIDFS_BASEDIR,
        GenericTestUtils.getTestDir("my-test-quota").getAbsolutePath());
    conf.setInt("dfs.content-summary.limit", 4);
    conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, DEFAULT_BLOCK_SIZE);
    /*
     * Make it relinquish locks. When run serially, the result should be
     * identical.
     */
    conf.setInt(DFSConfigKeys.DFS_CONTENT_SUMMARY_LIMIT_KEY, 2);
    restartCluster();

    dfs = (DistributedFileSystem) cluster.getFileSystem();
    redirectStream();

    final String nnAddr = conf.get(DFSConfigKeys.DFS_NAMENODE_HTTP_ADDRESS_KEY);
    final String webhdfsuri = WebHdfsConstants.WEBHDFS_SCHEME + "://" + nnAddr;
    System.out.println("webhdfsuri=" + webhdfsuri);
    webhdfs = new Path(webhdfsuri).getFileSystem(conf);
  }

  private static void restartCluster() throws IOException {
    if (cluster != null) {
      cluster.shutdown();
    }
    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3).build();
    cluster.waitActive();
  }

  private static void redirectStream() {
    System.setOut(new PrintStream(OUT_STREAM));
    System.setErr(new PrintStream(ERR_STREAM));
  }

  private static void resetStream() {
    OUT_STREAM.reset();
    ERR_STREAM.reset();
  }

  @AfterClass
  public static void tearDownClass() throws Exception {
    try {
      System.out.flush();
      System.err.flush();
    } finally {
      System.setOut(OLD_OUT);
      System.setErr(OLD_ERR);
    }

    if (cluster != null) {
      cluster.shutdown();
      cluster = null;
    }

    resetStream();
  }

  private void runCommand(DFSAdmin admin, boolean expectError, String... args) 
                         throws Exception {
    runCommand(admin, args, expectError);
  }
  
  private void runCommand(DFSAdmin admin, String args[], boolean expectEror)
  throws Exception {
    int val = admin.run(args);
    if (expectEror) {
      assertEquals(-1, val);
    } else {
      assertTrue(val>=0);
    }
  }
  
  /**
   * Tests to make sure we're getting human readable Quota exception messages
   * Test for @link{ NSQuotaExceededException, DSQuotaExceededException}
   * @throws Exception
   */
  @Test
  public void testDSQuotaExceededExceptionIsHumanReadable() throws Exception {
    Integer bytes = 1024;
    try {
      throw new DSQuotaExceededException(bytes, bytes);
    } catch(DSQuotaExceededException e) {
      
      assertEquals("The DiskSpace quota is exceeded: quota = 1024 B = 1 KB"
          + " but diskspace consumed = 1024 B = 1 KB", e.getMessage());
    }
  }
  
  /** Test quota related commands: 
   *    setQuota, clrQuota, setSpaceQuota, clrSpaceQuota, and count 
   */
  @Test
  public void testQuotaCommands() throws Exception {
    DFSAdmin admin = new DFSAdmin(conf);
    final Path dir = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(dir));

    final int fileLen = 1024;
    final short replication = 5;
    final long spaceQuota = fileLen * replication * 15 / 8;

    // 1: create a test directory
    final Path parent = new Path(dir, "test");
    assertTrue(dfs.mkdirs(parent));

    // Try setting name quota with suffixes
    String[] args;
    args = new String[]{"-setQuota", "3K", parent.toString()};
    runCommand(admin, args, false);
    args = new String[]{"-setQuota", "3m", parent.toString()};
    runCommand(admin, args, false);
    // Set the final name quota to 3
    args = new String[]{"-setQuota", "3", parent.toString()};
    runCommand(admin, args, false);


    //try setting space quota with a 'binary prefix'
    runCommand(admin, false, "-setSpaceQuota", "2t", parent.toString());
    assertEquals(2L<<40, dfs.getContentSummary(parent).getSpaceQuota());

    // set diskspace quota to 10000
    runCommand(admin, false, "-setSpaceQuota",
               Long.toString(spaceQuota), parent.toString());

    // 2: create directory /test/data0
    final Path childDir0 = new Path(parent, "data0");
    assertTrue(dfs.mkdirs(childDir0));

    // 3: create a file /test/datafile0
    final Path childFile0 = new Path(parent, "datafile0");
    DFSTestUtil.createFile(dfs, childFile0, fileLen, replication, 0);
    
    // 4: count -q /test
    ContentSummary c = dfs.getContentSummary(parent);
    compareQuotaUsage(c, dfs, parent);
    assertEquals(c.getFileCount()+c.getDirectoryCount(), 3);
    assertEquals(c.getQuota(), 3);
    assertEquals(c.getSpaceConsumed(), fileLen*replication);
    assertEquals(c.getSpaceQuota(), spaceQuota);

    // 5: count -q /test/data0
    c = dfs.getContentSummary(childDir0);
    compareQuotaUsage(c, dfs, childDir0);
    assertEquals(c.getFileCount()+c.getDirectoryCount(), 1);
    assertEquals(c.getQuota(), -1);
    // check disk space consumed
    c = dfs.getContentSummary(parent);
    compareQuotaUsage(c, dfs, parent);
    assertEquals(c.getSpaceConsumed(), fileLen*replication);

    // 6: create a directory /test/data1
    final Path childDir1 = new Path(parent, "data1");
    boolean hasException = false;
    try {
      assertFalse(dfs.mkdirs(childDir1));
    } catch (QuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);

    OutputStream fout;

    // 7: create a file /test/datafile1
    final Path childFile1 = new Path(parent, "datafile1");
    hasException = false;
    try {
      fout = dfs.create(childFile1);
    } catch (QuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);

    // 8: clear quota /test
    runCommand(admin, new String[]{"-clrQuota", parent.toString()}, false);
    c = dfs.getContentSummary(parent);
    compareQuotaUsage(c, dfs, parent);
    assertEquals(c.getQuota(), -1);
    assertEquals(c.getSpaceQuota(), spaceQuota);

    // 9: clear quota /test/data0
    runCommand(admin, new String[]{"-clrQuota", childDir0.toString()}, false);
    c = dfs.getContentSummary(childDir0);
    compareQuotaUsage(c, dfs, childDir0);
    assertEquals(c.getQuota(), -1);

    // 10: create a file /test/datafile1
    fout = dfs.create(childFile1, replication);

    // 10.s: but writing fileLen bytes should result in an quota exception
    try {
      fout.write(new byte[fileLen]);
      fout.close();
      Assert.fail();
    } catch (QuotaExceededException e) {
      IOUtils.closeStream(fout);
    }

    //delete the file
    dfs.delete(childFile1, false);

    // 9.s: clear diskspace quota
    runCommand(admin, false, "-clrSpaceQuota", parent.toString());
    c = dfs.getContentSummary(parent);
    compareQuotaUsage(c, dfs, parent);
    assertEquals(c.getQuota(), -1);
    assertEquals(c.getSpaceQuota(), -1);

    // now creating childFile1 should succeed
    DFSTestUtil.createFile(dfs, childFile1, fileLen, replication, 0);

    // 11: set the quota of /test to be 1
    // HADOOP-5872 - we can set quota even if it is immediately violated
    args = new String[]{"-setQuota", "1", parent.toString()};
    runCommand(admin, args, false);
    runCommand(admin, false, "-setSpaceQuota",  // for space quota
               Integer.toString(fileLen), args[2]);

    // 12: set the quota of /test/data0 to be 1
    args = new String[]{"-setQuota", "1", childDir0.toString()};
    runCommand(admin, args, false);

    // 13: not able create a directory under data0
    hasException = false;
    try {
      assertFalse(dfs.mkdirs(new Path(childDir0, "in")));
    } catch (QuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);
    c = dfs.getContentSummary(childDir0);
    compareQuotaUsage(c, dfs, childDir0);
    assertEquals(c.getDirectoryCount()+c.getFileCount(), 1);
    assertEquals(c.getQuota(), 1);

    // 14a: set quota on a non-existent directory
    Path nonExistentPath = new Path(dir, "test1");
    assertFalse(dfs.exists(nonExistentPath));
    args = new String[]{"-setQuota", "1", nonExistentPath.toString()};
    runCommand(admin, args, true);
    runCommand(admin, true, "-setSpaceQuota", "1g", // for space quota
               nonExistentPath.toString());

    // 14b: set quota on a file
    assertTrue(dfs.isFile(childFile0));
    args[1] = childFile0.toString();
    runCommand(admin, args, true);
    // same for space quota
    runCommand(admin, true, "-setSpaceQuota", "1t", args[1]);

    // 15a: clear quota on a file
    args[0] = "-clrQuota";
    runCommand(admin, args, true);
    runCommand(admin, true, "-clrSpaceQuota", args[1]);

    // 15b: clear quota on a non-existent directory
    args[1] = nonExistentPath.toString();
    runCommand(admin, args, true);
    runCommand(admin, true, "-clrSpaceQuota", args[1]);

    // 16a: set the quota of /test to be 0
    args = new String[]{"-setQuota", "0", parent.toString()};
    runCommand(admin, args, true);
    runCommand(admin, false, "-setSpaceQuota", "0", args[2]);

    // 16b: set the quota of /test to be -1
    args[1] = "-1";
    runCommand(admin, args, true);
    runCommand(admin, true, "-setSpaceQuota", args[1], args[2]);

    // 16c: set the quota of /test to be Long.MAX_VALUE+1
    args[1] = String.valueOf(Long.MAX_VALUE+1L);
    runCommand(admin, args, true);
    runCommand(admin, true, "-setSpaceQuota", args[1], args[2]);

    // 16d: set the quota of /test to be a non integer
    args[1] = "33aa1.5";
    runCommand(admin, args, true);
    runCommand(admin, true, "-setSpaceQuota", args[1], args[2]);

    // 16e: set space quota with a value larger than Long.MAX_VALUE
    runCommand(admin, true, "-setSpaceQuota",
               (Long.MAX_VALUE/1024/1024 + 1024) + "m", args[2]);

    // 17:  setQuota by a non-administrator
    final String username = "userxx";
    UserGroupInformation ugi =
      UserGroupInformation.createUserForTesting(username,
                                                new String[]{"groupyy"});

    final String[] args2 = args.clone(); // need final ref for doAs block
    ugi.doAs(new PrivilegedExceptionAction<Object>() {
      @Override
      public Object run() throws Exception {
        assertEquals("Not running as new user", username,
            UserGroupInformation.getCurrentUser().getShortUserName());
        DFSAdmin userAdmin = new DFSAdmin(conf);

        args2[1] = "100";
        runCommand(userAdmin, args2, true);
        runCommand(userAdmin, true, "-setSpaceQuota", "1g", args2[2]);

        // 18: clrQuota by a non-administrator
        String[] args3 = new String[] {"-clrQuota", parent.toString()};
        runCommand(userAdmin, args3, true);
        runCommand(userAdmin, true, "-clrSpaceQuota",  args3[1]);

        return null;
      }
    });

    // 19: clrQuota on the root directory ("/") should fail
    runCommand(admin, true, "-clrQuota", "/");

    // 20: setQuota on the root directory ("/") should succeed
    runCommand(admin, false, "-setQuota", "1000000", "/");

    runCommand(admin, true, "-clrQuota", "/");
    runCommand(admin, false, "-clrSpaceQuota", "/");
    runCommand(admin, new String[]{"-clrQuota", parent.toString()}, false);
    runCommand(admin, false, "-clrSpaceQuota", parent.toString());


    // 2: create directory /test/data2
    final Path childDir2 = new Path(parent, "data2");
    assertTrue(dfs.mkdirs(childDir2));


    final Path childFile2 = new Path(childDir2, "datafile2");
    final Path childFile3 = new Path(childDir2, "datafile3");
    final long spaceQuota2 = DEFAULT_BLOCK_SIZE * replication;
    final long fileLen2 = DEFAULT_BLOCK_SIZE;
    // set space quota to a real low value
    runCommand(admin, false, "-setSpaceQuota", Long.toString(spaceQuota2), childDir2.toString());
    // clear space quota
    runCommand(admin, false, "-clrSpaceQuota", childDir2.toString());
    // create a file that is greater than the size of space quota
    DFSTestUtil.createFile(dfs, childFile2, fileLen2, replication, 0);

    // now set space quota again. This should succeed
    runCommand(admin, false, "-setSpaceQuota", Long.toString(spaceQuota2), childDir2.toString());

    hasException = false;
    try {
      DFSTestUtil.createFile(dfs, childFile3, fileLen2, replication, 0);
    } catch (DSQuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);

    // now test the same for root
    final Path childFile4 = new Path(dir, "datafile2");
    final Path childFile5 = new Path(dir, "datafile3");

    runCommand(admin, true, "-clrQuota", "/");
    runCommand(admin, false, "-clrSpaceQuota", "/");
    // set space quota to a real low value
    runCommand(admin, false, "-setSpaceQuota", Long.toString(spaceQuota2), "/");
    runCommand(admin, false, "-clrSpaceQuota", "/");
    DFSTestUtil.createFile(dfs, childFile4, fileLen2, replication, 0);
    runCommand(admin, false, "-setSpaceQuota", Long.toString(spaceQuota2), "/");

    hasException = false;
    try {
      DFSTestUtil.createFile(dfs, childFile5, fileLen2, replication, 0);
    } catch (DSQuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);

    assertEquals(5, cluster.getNamesystem().getFSDirectory().getYieldCount());

    /*
     * clear sapce quota for root, otherwise other tests may fail due to
     * insufficient space quota.
     */
    runCommand(admin, false, "-clrSpaceQuota", "/");
  }
  
  /** Test commands that change the size of the name space:
   *  mkdirs, rename, and delete */
  @Test
  public void testNamespaceCommands() throws Exception {
    final Path parent = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(parent));

    // 1: create directory nqdir0/qdir1/qdir20/nqdir30
    assertTrue(dfs.mkdirs(new Path(parent, "nqdir0/qdir1/qdir20/nqdir30")));

    // 2: set the quota of nqdir0/qdir1 to be 6
    final Path quotaDir1 = new Path(parent, "nqdir0/qdir1");
    dfs.setQuota(quotaDir1, 6, HdfsConstants.QUOTA_DONT_SET);
    ContentSummary c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getDirectoryCount(), 3);
    assertEquals(c.getQuota(), 6);

    // 3: set the quota of nqdir0/qdir1/qdir20 to be 7
    final Path quotaDir2 = new Path(parent, "nqdir0/qdir1/qdir20");
    dfs.setQuota(quotaDir2, 7, HdfsConstants.QUOTA_DONT_SET);
    c = dfs.getContentSummary(quotaDir2);
    compareQuotaUsage(c, dfs, quotaDir2);
    assertEquals(c.getDirectoryCount(), 2);
    assertEquals(c.getQuota(), 7);

    // 4: Create directory nqdir0/qdir1/qdir21 and set its quota to 2
    final Path quotaDir3 = new Path(parent, "nqdir0/qdir1/qdir21");
    assertTrue(dfs.mkdirs(quotaDir3));
    dfs.setQuota(quotaDir3, 2, HdfsConstants.QUOTA_DONT_SET);
    c = dfs.getContentSummary(quotaDir3);
    compareQuotaUsage(c, dfs, quotaDir3);
    assertEquals(c.getDirectoryCount(), 1);
    assertEquals(c.getQuota(), 2);

    // 5: Create directory nqdir0/qdir1/qdir21/nqdir32
    Path tempPath = new Path(quotaDir3, "nqdir32");
    assertTrue(dfs.mkdirs(tempPath));
    c = dfs.getContentSummary(quotaDir3);
    compareQuotaUsage(c, dfs, quotaDir3);
    assertEquals(c.getDirectoryCount(), 2);
    assertEquals(c.getQuota(), 2);

    // 6: Create directory nqdir0/qdir1/qdir21/nqdir33
    tempPath = new Path(quotaDir3, "nqdir33");
    boolean hasException = false;
    try {
      assertFalse(dfs.mkdirs(tempPath));
    } catch (NSQuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);
    c = dfs.getContentSummary(quotaDir3);
    compareQuotaUsage(c, dfs, quotaDir3);
    assertEquals(c.getDirectoryCount(), 2);
    assertEquals(c.getQuota(), 2);

    // 7: Create directory nqdir0/qdir1/qdir20/nqdir31
    tempPath = new Path(quotaDir2, "nqdir31");
    assertTrue(dfs.mkdirs(tempPath));
    c = dfs.getContentSummary(quotaDir2);
    compareQuotaUsage(c, dfs, quotaDir2);
    assertEquals(c.getDirectoryCount(), 3);
    assertEquals(c.getQuota(), 7);
    c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getDirectoryCount(), 6);
    assertEquals(c.getQuota(), 6);

    // 8: Create directory nqdir0/qdir1/qdir20/nqdir33
    tempPath = new Path(quotaDir2, "nqdir33");
    hasException = false;
    try {
      assertFalse(dfs.mkdirs(tempPath));
    } catch (NSQuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);

    // 9: Move nqdir0/qdir1/qdir21/nqdir32 nqdir0/qdir1/qdir20/nqdir30
    tempPath = new Path(quotaDir2, "nqdir30");
    dfs.rename(new Path(quotaDir3, "nqdir32"), tempPath);
    c = dfs.getContentSummary(quotaDir2);
    compareQuotaUsage(c, dfs, quotaDir2);
    assertEquals(c.getDirectoryCount(), 4);
    assertEquals(c.getQuota(), 7);
    c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getDirectoryCount(), 6);
    assertEquals(c.getQuota(), 6);

    // 10: Move nqdir0/qdir1/qdir20/nqdir30 to nqdir0/qdir1/qdir21
    hasException = false;
    try {
      assertFalse(dfs.rename(tempPath, quotaDir3));
    } catch (NSQuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);
    assertTrue(dfs.exists(tempPath));
    assertFalse(dfs.exists(new Path(quotaDir3, "nqdir30")));
    
    // 10.a: Rename nqdir0/qdir1/qdir20/nqdir30 to nqdir0/qdir1/qdir21/nqdir32
    hasException = false;
    try {
      assertFalse(dfs.rename(tempPath, new Path(quotaDir3, "nqdir32")));
    } catch (QuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);
    assertTrue(dfs.exists(tempPath));
    assertFalse(dfs.exists(new Path(quotaDir3, "nqdir32")));

    // 11: Move nqdir0/qdir1/qdir20/nqdir30 to nqdir0
    assertTrue(dfs.rename(tempPath, new Path(parent, "nqdir0")));
    c = dfs.getContentSummary(quotaDir2);
    compareQuotaUsage(c, dfs, quotaDir2);
    assertEquals(c.getDirectoryCount(), 2);
    assertEquals(c.getQuota(), 7);
    c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getDirectoryCount(), 4);
    assertEquals(c.getQuota(), 6);

    // 12: Create directory nqdir0/nqdir30/nqdir33
    assertTrue(dfs.mkdirs(new Path(parent, "nqdir0/nqdir30/nqdir33")));

    // 13: Move nqdir0/nqdir30 nqdir0/qdir1/qdir20/qdir30
    hasException = false;
    try {
      assertFalse(dfs.rename(new Path(parent, "nqdir0/nqdir30"), tempPath));
    } catch (NSQuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);

    // 14: Move nqdir0/qdir1/qdir21 nqdir0/qdir1/qdir20
    assertTrue(dfs.rename(quotaDir3, quotaDir2));
    c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getDirectoryCount(), 4);
    assertEquals(c.getQuota(), 6);
    c = dfs.getContentSummary(quotaDir2);
    compareQuotaUsage(c, dfs, quotaDir2);
    assertEquals(c.getDirectoryCount(), 3);
    assertEquals(c.getQuota(), 7);
    tempPath = new Path(quotaDir2, "qdir21");
    c = dfs.getContentSummary(tempPath);
    compareQuotaUsage(c, dfs, tempPath);
    assertEquals(c.getDirectoryCount(), 1);
    assertEquals(c.getQuota(), 2);

    // 15: Delete nqdir0/qdir1/qdir20/qdir21
    dfs.delete(tempPath, true);
    c = dfs.getContentSummary(quotaDir2);
    compareQuotaUsage(c, dfs, quotaDir2);
    assertEquals(c.getDirectoryCount(), 2);
    assertEquals(c.getQuota(), 7);
    c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getDirectoryCount(), 3);
    assertEquals(c.getQuota(), 6);

    // 16: Move nqdir0/qdir30 nqdir0/qdir1/qdir20
    assertTrue(dfs.rename(new Path(parent, "nqdir0/nqdir30"), quotaDir2));
    c = dfs.getContentSummary(quotaDir2);
    compareQuotaUsage(c, dfs, quotaDir2);
    assertEquals(c.getDirectoryCount(), 5);
    assertEquals(c.getQuota(), 7);
    c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getDirectoryCount(), 6);
    assertEquals(c.getQuota(), 6);
  }
  
  /**
   * Test HDFS operations that change disk space consumed by a directory tree.
   * namely create, rename, delete, append, and setReplication.
   * 
   * This is based on testNamespaceCommands() above.
   */
  @Test
  public void testSpaceCommands() throws Exception {
    final Path parent = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(parent));

    int fileLen = 1024;
    short replication = 3;
    int fileSpace = fileLen * replication;

    // create directory nqdir0/qdir1/qdir20/nqdir30
    assertTrue(dfs.mkdirs(new Path(parent, "nqdir0/qdir1/qdir20/nqdir30")));

    // set the quota of nqdir0/qdir1 to 4 * fileSpace
    final Path quotaDir1 = new Path(parent, "nqdir0/qdir1");
    dfs.setQuota(quotaDir1, HdfsConstants.QUOTA_DONT_SET, 4 * fileSpace);
    ContentSummary c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getSpaceQuota(), 4 * fileSpace);

    // set the quota of nqdir0/qdir1/qdir20 to 6 * fileSpace
    final Path quotaDir20 = new Path(parent, "nqdir0/qdir1/qdir20");
    dfs.setQuota(quotaDir20, HdfsConstants.QUOTA_DONT_SET, 6 * fileSpace);
    c = dfs.getContentSummary(quotaDir20);
    compareQuotaUsage(c, dfs, quotaDir20);
    assertEquals(c.getSpaceQuota(), 6 * fileSpace);

    // Create nqdir0/qdir1/qdir21 and set its space quota to 2 * fileSpace
    final Path quotaDir21 = new Path(parent, "nqdir0/qdir1/qdir21");
    assertTrue(dfs.mkdirs(quotaDir21));
    dfs.setQuota(quotaDir21, HdfsConstants.QUOTA_DONT_SET, 2 * fileSpace);
    c = dfs.getContentSummary(quotaDir21);
    compareQuotaUsage(c, dfs, quotaDir21);
    assertEquals(c.getSpaceQuota(), 2 * fileSpace);

    // 5: Create directory nqdir0/qdir1/qdir21/nqdir32
    Path tempPath = new Path(quotaDir21, "nqdir32");
    assertTrue(dfs.mkdirs(tempPath));

    // create a file under nqdir32/fileDir
    DFSTestUtil.createFile(dfs, new Path(tempPath, "fileDir/file1"), fileLen,
                           replication, 0);
    c = dfs.getContentSummary(quotaDir21);
    compareQuotaUsage(c, dfs, quotaDir21);
    assertEquals(c.getSpaceConsumed(), fileSpace);

    // Create a larger file nqdir0/qdir1/qdir21/nqdir33/
    boolean hasException = false;
    try {
      DFSTestUtil.createFile(dfs, new Path(quotaDir21, "nqdir33/file2"),
                             2*fileLen, replication, 0);
    } catch (DSQuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);
    // delete nqdir33
    assertTrue(dfs.delete(new Path(quotaDir21, "nqdir33"), true));
    c = dfs.getContentSummary(quotaDir21);
    compareQuotaUsage(c, dfs, quotaDir21);
    assertEquals(c.getSpaceConsumed(), fileSpace);
    assertEquals(c.getSpaceQuota(), 2*fileSpace);

    // Verify space before the move:
    c = dfs.getContentSummary(quotaDir20);
    compareQuotaUsage(c, dfs, quotaDir20);
    assertEquals(c.getSpaceConsumed(), 0);

    // Move nqdir0/qdir1/qdir21/nqdir32 nqdir0/qdir1/qdir20/nqdir30
    Path dstPath = new Path(quotaDir20, "nqdir30");
    Path srcPath = new Path(quotaDir21, "nqdir32");
    assertTrue(dfs.rename(srcPath, dstPath));

    // verify space after the move
    c = dfs.getContentSummary(quotaDir20);
    assertEquals(c.getSpaceConsumed(), fileSpace);
    // verify space for its parent
    c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getSpaceConsumed(), fileSpace);
    // verify space for source for the move
    c = dfs.getContentSummary(quotaDir21);
    compareQuotaUsage(c, dfs, quotaDir21);
    assertEquals(c.getSpaceConsumed(), 0);

    final Path file2 = new Path(dstPath, "fileDir/file2");
    int file2Len = 2 * fileLen;
    // create a larger file under nqdir0/qdir1/qdir20/nqdir30
    DFSTestUtil.createFile(dfs, file2, file2Len, replication, 0);

    c = dfs.getContentSummary(quotaDir20);
    assertEquals(c.getSpaceConsumed(), 3 * fileSpace);
    c = dfs.getContentSummary(quotaDir21);
    compareQuotaUsage(c, dfs, quotaDir21);
    assertEquals(c.getSpaceConsumed(), 0);

    // Reverse: Move nqdir0/qdir1/qdir20/nqdir30 to nqdir0/qdir1/qdir21/
    hasException = false;
    try {
      assertFalse(dfs.rename(dstPath, srcPath));
    } catch (DSQuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);

    // make sure no intermediate directories left by failed rename
    assertFalse(dfs.exists(srcPath));
    // directory should exist
    assertTrue(dfs.exists(dstPath));

    // verify space after the failed move
    c = dfs.getContentSummary(quotaDir20);
    assertEquals(c.getSpaceConsumed(), 3 * fileSpace);
    c = dfs.getContentSummary(quotaDir21);
    compareQuotaUsage(c, dfs, quotaDir21);
    assertEquals(c.getSpaceConsumed(), 0);

    // Test Append :

    // verify space quota
    c = dfs.getContentSummary(quotaDir1);
    compareQuotaUsage(c, dfs, quotaDir1);
    assertEquals(c.getSpaceQuota(), 4 * fileSpace);

    // verify space before append;
    c = dfs.getContentSummary(dstPath);
    compareQuotaUsage(c, dfs, dstPath);
    assertEquals(c.getSpaceConsumed(), 3 * fileSpace);

    OutputStream out = dfs.append(file2);
    // appending 1 fileLen should succeed
    out.write(new byte[fileLen]);
    out.close();

    file2Len += fileLen; // after append

    // verify space after append;
    c = dfs.getContentSummary(dstPath);
    compareQuotaUsage(c, dfs, dstPath);
    assertEquals(c.getSpaceConsumed(), 4 * fileSpace);

    // now increase the quota for quotaDir1
    dfs.setQuota(quotaDir1, HdfsConstants.QUOTA_DONT_SET, 5 * fileSpace);
    // Now, appending more than 1 fileLen should result in an error
    out = dfs.append(file2);
    hasException = false;
    try {
      out.write(new byte[fileLen + 1024]);
      out.flush();
      out.close();
    } catch (DSQuotaExceededException e) {
      hasException = true;
      IOUtils.closeStream(out);
    }
    assertTrue(hasException);

    file2Len += fileLen; // after partial append

    // verify space after partial append
    c = dfs.getContentSummary(dstPath);
    compareQuotaUsage(c, dfs, dstPath);
    assertEquals(c.getSpaceConsumed(), 5 * fileSpace);

    // Test set replication :

    // first reduce the replication
    dfs.setReplication(file2, (short)(replication-1));

    // verify that space is reduced by file2Len
    c = dfs.getContentSummary(dstPath);
    compareQuotaUsage(c, dfs, dstPath);
    assertEquals(c.getSpaceConsumed(), 5 * fileSpace - file2Len);

    // now try to increase the replication and and expect an error.
    hasException = false;
    try {
      dfs.setReplication(file2, (short)(replication+1));
    } catch (DSQuotaExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);

    // verify space consumed remains unchanged.
    c = dfs.getContentSummary(dstPath);
    compareQuotaUsage(c, dfs, dstPath);
    assertEquals(c.getSpaceConsumed(), 5 * fileSpace - file2Len);

    // now increase the quota for quotaDir1 and quotaDir20
    dfs.setQuota(quotaDir1, HdfsConstants.QUOTA_DONT_SET, 10 * fileSpace);
    dfs.setQuota(quotaDir20, HdfsConstants.QUOTA_DONT_SET, 10 * fileSpace);

    // then increasing replication should be ok.
    dfs.setReplication(file2, (short)(replication+1));
    // verify increase in space
    c = dfs.getContentSummary(dstPath);
    compareQuotaUsage(c, dfs, dstPath);
    assertEquals(c.getSpaceConsumed(), 5 * fileSpace + file2Len);

    // Test HDFS-2053 :

    // Create directory hdfs-2053
    final Path quotaDir2053 = new Path(parent, "hdfs-2053");
    assertTrue(dfs.mkdirs(quotaDir2053));

    // Create subdirectories /hdfs-2053/{A,B,C}
    final Path quotaDir2053_A = new Path(quotaDir2053, "A");
    assertTrue(dfs.mkdirs(quotaDir2053_A));
    final Path quotaDir2053_B = new Path(quotaDir2053, "B");
    assertTrue(dfs.mkdirs(quotaDir2053_B));
    final Path quotaDir2053_C = new Path(quotaDir2053, "C");
    assertTrue(dfs.mkdirs(quotaDir2053_C));

    // Factors to vary the sizes of test files created in each subdir.
    // The actual factors are not really important but they allow us to create
    // identifiable file sizes per subdir, which helps during debugging.
    int sizeFactorA = 1;
    int sizeFactorB = 2;
    int sizeFactorC = 4;

    // Set space quota for subdirectory C
    dfs.setQuota(quotaDir2053_C, HdfsConstants.QUOTA_DONT_SET,
        (sizeFactorC + 1) * fileSpace);
    c = dfs.getContentSummary(quotaDir2053_C);
    compareQuotaUsage(c, dfs, quotaDir2053_C);
    assertEquals(c.getSpaceQuota(), (sizeFactorC + 1) * fileSpace);

    // Create a file under subdirectory A
    DFSTestUtil.createFile(dfs, new Path(quotaDir2053_A, "fileA"),
        sizeFactorA * fileLen, replication, 0);
    c = dfs.getContentSummary(quotaDir2053_A);
    compareQuotaUsage(c, dfs, quotaDir2053_A);
    assertEquals(c.getSpaceConsumed(), sizeFactorA * fileSpace);

    // Create a file under subdirectory B
    DFSTestUtil.createFile(dfs, new Path(quotaDir2053_B, "fileB"),
        sizeFactorB * fileLen, replication, 0);
    c = dfs.getContentSummary(quotaDir2053_B);
    compareQuotaUsage(c, dfs, quotaDir2053_B);
    assertEquals(c.getSpaceConsumed(), sizeFactorB * fileSpace);

    // Create a file under subdirectory C (which has a space quota)
    DFSTestUtil.createFile(dfs, new Path(quotaDir2053_C, "fileC"),
        sizeFactorC * fileLen, replication, 0);
    c = dfs.getContentSummary(quotaDir2053_C);
    compareQuotaUsage(c, dfs, quotaDir2053_C);
    assertEquals(c.getSpaceConsumed(), sizeFactorC * fileSpace);

    // Check space consumed for /hdfs-2053
    c = dfs.getContentSummary(quotaDir2053);
    compareQuotaUsage(c, dfs, quotaDir2053);
    assertEquals(c.getSpaceConsumed(),
        (sizeFactorA + sizeFactorB + sizeFactorC) * fileSpace);
  }

  /**
   * Test quota by storage type.
   */
  @Test
  public void testQuotaByStorageType() throws Exception {
    final Path parent = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(parent));

    int fileLen = 1024;
    short replication = 3;
    int fileSpace = fileLen * replication;

    final Path quotaDir20 = new Path(parent, "nqdir0/qdir1/qdir20");
    assertTrue(dfs.mkdirs(quotaDir20));
    dfs.setQuota(quotaDir20, HdfsConstants.QUOTA_DONT_SET, 6 * fileSpace);

    // Verify DirectoryWithQuotaFeature's storage type usage
    // is updated properly after deletion.
    // File creation followed by deletion shouldn't change storage type
    // usage regardless whether storage policy is set.
    Path file = new Path(quotaDir20, "fileDir/file1");
    DFSTestUtil.createFile(dfs, file, fileLen * 3, replication, 0);
    dfs.delete(file, false);
    dfs.setStoragePolicy(quotaDir20, HdfsConstants.HOT_STORAGE_POLICY_NAME);
    dfs.setQuotaByStorageType(quotaDir20, StorageType.DEFAULT,
        2 * fileSpace);
    boolean hasException = false;
    try {
      DFSTestUtil.createFile(dfs, file, fileLen * 3, replication, 0);
    } catch (QuotaByStorageTypeExceededException e) {
      hasException = true;
    }
    assertTrue(hasException);
    dfs.delete(file, false);
    dfs.setQuotaByStorageType(quotaDir20, StorageType.DEFAULT,
        6 * fileSpace);
  }

  private static void checkContentSummary(final ContentSummary expected,
      final ContentSummary computed) {
    assertEquals(expected.toString(), computed.toString());
  }
 
  /**
   * Test limit cases for setting space quotas.
   */
  @Test
  public void testMaxSpaceQuotas() throws Exception {
    final Path parent = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(parent));

    final FileSystem fs = cluster.getFileSystem();
    assertTrue("Not a HDFS: "+fs.getUri(),
                fs instanceof DistributedFileSystem);
    final DistributedFileSystem dfs = (DistributedFileSystem)fs;

    // create test directory
    final Path testFolder = new Path(parent, "testFolder");
    assertTrue(dfs.mkdirs(testFolder));

    // setting namespace quota to Long.MAX_VALUE - 1 should work
    dfs.setQuota(testFolder, Long.MAX_VALUE - 1, 10);
    ContentSummary c = dfs.getContentSummary(testFolder);
    compareQuotaUsage(c, dfs, testFolder);
    assertTrue("Quota not set properly", c.getQuota() == Long.MAX_VALUE - 1);

    // setting diskspace quota to Long.MAX_VALUE - 1 should work
    dfs.setQuota(testFolder, 10, Long.MAX_VALUE - 1);
    c = dfs.getContentSummary(testFolder);
    compareQuotaUsage(c, dfs, testFolder);
    assertTrue("Quota not set properly", c.getSpaceQuota() == Long.MAX_VALUE - 1);

    // setting namespace quota to Long.MAX_VALUE should not work + no error
    dfs.setQuota(testFolder, Long.MAX_VALUE, 10);
    c = dfs.getContentSummary(testFolder);
    compareQuotaUsage(c, dfs, testFolder);
    assertTrue("Quota should not have changed", c.getQuota() == 10);

    // setting diskspace quota to Long.MAX_VALUE should not work + no error
    dfs.setQuota(testFolder, 10, Long.MAX_VALUE);
    c = dfs.getContentSummary(testFolder);
    compareQuotaUsage(c, dfs, testFolder);
    assertTrue("Quota should not have changed", c.getSpaceQuota() == 10);

    // setting namespace quota to Long.MAX_VALUE + 1 should not work + error
    try {
      dfs.setQuota(testFolder, Long.MAX_VALUE + 1, 10);
      fail("Exception not thrown");
    } catch (IllegalArgumentException e) {
      // Expected
    }

    // setting diskspace quota to Long.MAX_VALUE + 1 should not work + error
    try {
      dfs.setQuota(testFolder, 10, Long.MAX_VALUE + 1);
      fail("Exception not thrown");
    } catch (IllegalArgumentException e) {
      // Expected
    }
  }

  /**
   * Violate a space quota using files of size < 1 block. Test that block
   * allocation conservatively assumes that for quota checking the entire
   * space of the block is used.
   */
  @Test
  public void testBlockAllocationAdjustsUsageConservatively() 
      throws Exception {
    final Path parent = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(parent));

    DFSAdmin admin = new DFSAdmin(conf);
    Path dir = new Path(parent, "test");
    Path file1 = new Path(parent, "test/test1");
    Path file2 = new Path(parent, "test/test2");
    boolean exceededQuota = false;
    final int QUOTA_SIZE = 3 * DEFAULT_BLOCK_SIZE; // total space usage including
                                           // repl.
    final int FILE_SIZE = DEFAULT_BLOCK_SIZE / 2;
    ContentSummary c;

    // Create the directory and set the quota
    assertTrue(dfs.mkdirs(dir));
    runCommand(admin, false, "-setSpaceQuota", Integer.toString(QUOTA_SIZE),
         dir.toString());

    // Creating a file should use half the quota
    DFSTestUtil.createFile(dfs, file1, FILE_SIZE, (short) 3, 1L);
    DFSTestUtil.waitReplication(dfs, file1, (short) 3);
    c = dfs.getContentSummary(dir);
    compareQuotaUsage(c, dfs, dir);
    checkContentSummary(c, webhdfs.getContentSummary(dir));
    assertEquals("Quota is half consumed", QUOTA_SIZE / 2,
                 c.getSpaceConsumed());

    // We can not create the 2nd file because even though the total spaced
    // used by two files (2 * 3 * 512/2) would fit within the quota (3 * 512)
    // when a block for a file is created the space used is adjusted
    // conservatively (3 * block size, ie assumes a full block is written)
    // which will violate the quota (3 * block size) since we've already
    // used half the quota for the first file.
    try {
      DFSTestUtil.createFile(dfs, file2, FILE_SIZE, (short) 3, 1L);
    } catch (QuotaExceededException e) {
      exceededQuota = true;
    }
    assertTrue("Quota not exceeded", exceededQuota);
 }

 /**
  * Like the previous test but create many files. This covers bugs where
  * the quota adjustment is incorrect but it takes many files to accrue 
  * a big enough accounting error to violate the quota.
  */
  @Test
  public void testMultipleFilesSmallerThanOneBlock() throws Exception {
    final Path parent = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(parent));

    Configuration dfsConf = new HdfsConfiguration();
    final int BLOCK_SIZE = 6 * 1024;
    dfsConf.setInt(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCK_SIZE);
    // Make it relinquish locks. When run serially, the result should
    // be identical.
    dfsConf.setInt(DFSConfigKeys.DFS_CONTENT_SUMMARY_LIMIT_KEY, 2);
    MiniDFSCluster dfsCluster =
      new MiniDFSCluster.Builder(dfsConf).numDataNodes(3).build();
    dfsCluster.waitActive();
    FileSystem fs = dfsCluster.getFileSystem();
    DFSAdmin admin = new DFSAdmin(dfsConf);

    final String nnAddr = dfsConf.get(DFSConfigKeys.DFS_NAMENODE_HTTP_ADDRESS_KEY);
    final String webhdfsuri = WebHdfsConstants.WEBHDFS_SCHEME + "://" + nnAddr;
    System.out.println("webhdfsuri=" + webhdfsuri);
    final FileSystem webHDFS = new Path(webhdfsuri).getFileSystem(dfsConf);
    
    try {
      
      //Test for deafult NameSpace Quota
      long nsQuota = FSImageTestUtil.getNSQuota(dfsCluster.getNameNode()
          .getNamesystem());
      assertTrue(
          "Default namespace quota expected as long max. But the value is :"
              + nsQuota, nsQuota == Long.MAX_VALUE);
      
      Path dir = new Path(parent, "test");
      boolean exceededQuota = false;
      ContentSummary c;
      // 1kb file
      // 6kb block
      // 192kb quota
      final int FILE_SIZE = 1024;
      final int QUOTA_SIZE = 32 * (int) fs.getDefaultBlockSize(dir);
      assertEquals(6 * 1024, fs.getDefaultBlockSize(dir));
      assertEquals(192 * 1024, QUOTA_SIZE);

      // Create the dir and set the quota. We need to enable the quota before
      // writing the files as setting the quota afterwards will over-write
      // the cached disk space used for quota verification with the actual
      // amount used as calculated by INode#spaceConsumedInTree.
      assertTrue(fs.mkdirs(dir));
      runCommand(admin, false, "-setSpaceQuota", Integer.toString(QUOTA_SIZE),
          dir.toString());

      // We can create at most 59 files because block allocation is
      // conservative and initially assumes a full block is used, so we
      // need to leave at least 3 * BLOCK_SIZE free space when allocating
      // the last block: (58 * 3 * 1024) (3 * 6 * 1024) = 192kb
      for (int i = 0; i < 59; i++) {
        Path file = new Path(parent, "test/test"+i);
        DFSTestUtil.createFile(fs, file, FILE_SIZE, (short) 3, 1L);
        DFSTestUtil.waitReplication(fs, file, (short) 3);
      }

      // Should account for all 59 files (almost QUOTA_SIZE)
      c = fs.getContentSummary(dir);
      compareQuotaUsage(c, fs, dir);
      checkContentSummary(c, webHDFS.getContentSummary(dir));
      assertEquals("Invalid space consumed", 59 * FILE_SIZE * 3,
          c.getSpaceConsumed());
      assertEquals("Invalid space consumed", QUOTA_SIZE - (59 * FILE_SIZE * 3),
          3 * (fs.getDefaultBlockSize(dir) - FILE_SIZE));

      // Now check that trying to create another file violates the quota
      try {
        Path file = new Path(parent, "test/test59");
        DFSTestUtil.createFile(fs, file, FILE_SIZE, (short) 3, 1L);
        DFSTestUtil.waitReplication(fs, file, (short) 3);
      } catch (QuotaExceededException e) {
        exceededQuota = true;
      }
      assertTrue("Quota not exceeded", exceededQuota);
      assertEquals(2, dfsCluster.getNamesystem().getFSDirectory().getYieldCount());
    } finally {
      dfsCluster.shutdown();
    }
  }

  @Test
  public void testSetSpaceQuotaWhenStorageTypeIsWrong() throws Exception {
    Configuration conf = new HdfsConfiguration();
    conf.set(FS_DEFAULT_NAME_KEY, "hdfs://127.0.0.1:8020");
    DFSAdmin admin = new DFSAdmin(conf);
    ByteArrayOutputStream err = new ByteArrayOutputStream();
    PrintStream oldErr = System.err;
    try {
      System.setErr(new PrintStream(err));
      String[] args =
          { "-setSpaceQuota", "100", "-storageType", "COLD", "/testDir" };
      admin.run(args);
      String errOutput = new String(err.toByteArray(), Charsets.UTF_8);
      assertTrue(
          errOutput.contains(StorageType.getTypesSupportingQuota().toString()));
    } finally {
      System.setErr(oldErr);
    }
  }

   /**
   * File count on root , should return total value of files in Filesystem
   * when one folder contains files more than "dfs.content-summary.limit".
   */
  @Test
  public void testHugeFileCount() throws IOException {
    final Path parent = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(parent));

    for (int i = 1; i <= 5; i++) {
      FSDataOutputStream out =
          dfs.create(new Path(parent, "Folder1/" + "file" + i),(short)1);
      out.close();
    }
    FSDataOutputStream out = dfs.create(new Path(parent, "Folder2/file6"),(short)1);
    out.close();
    ContentSummary contentSummary = dfs.getContentSummary(parent);
    compareQuotaUsage(contentSummary, dfs, parent);
    assertEquals(6, contentSummary.getFileCount());
  }

  // check the QuotaUsage got from getContentSummary is the same as
  // getQuotaUsage
  private void compareQuotaUsage(final QuotaUsage fromContentSummary,
      final FileSystem fileSystem, final Path filePath) throws IOException {
    QuotaUsage quotaUsage = fileSystem.getQuotaUsage(filePath);
    assertEquals(fromContentSummary, quotaUsage);
  }


  /**
   * Test to set space quote using negative number.
   */
  @Test(timeout = 30000)
  public void testSetSpaceQuotaNegativeNumber() throws Exception {

    final DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final Path dir = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(dir));

    final List<String> outs = Lists.newArrayList();

    /* set space quota */
    resetStream();
    outs.clear();
    final int ret = ToolRunner.run(
        dfsAdmin,
        new String[] {"-setSpaceQuota", "-10", dir.toString()});
    assertEquals(-1, ret);
    scanIntoList(ERR_STREAM, outs);
    assertEquals(
        "It should be two lines of error messages,"
        + " the 1st one is about Illegal option,"
        + " the 2nd one is about SetSpaceQuota usage.",
        2, outs.size());
    assertThat(outs.get(0),
        is(allOf(containsString("setSpaceQuota"),
            containsString("Illegal option"))));
  }

  /**
   * Test to set and clear space quote, regular usage.
   */
  @Test(timeout = 30000)
  public void testSetAndClearSpaceQuotaRegular() throws Exception {

    final Path dir = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(dir));

    /* set space quota */
    testSetAndClearSpaceQuotaRegularInternal(
        new String[] {"-setSpaceQuota", "1024", dir.toString()},
        dir,
        0,
        1024);

    /* clear space quota */
    testSetAndClearSpaceQuotaRegularInternal(
        new String[] {"-clrSpaceQuota", dir.toString()},
        dir,
        0,
        -1);
  }

  /**
   * Test to all the commands by passing the fully qualified path.
   */
  @Test(timeout = 30000)
  public void testQuotaCommandsWithURI() throws Exception {
    DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final Path dir = new Path("/" + this.getClass().getSimpleName(),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(dir));

    /* set space quota */
    testSetAndClearSpaceQuotaRegularInternal(
        new String[] { "-setSpaceQuota", "1024",
            dfs.getUri() + "/" + dir.toString() }, dir, 0, 1024);

    /* clear space quota */
    testSetAndClearSpaceQuotaRegularInternal(
        new String[] { "-clrSpaceQuota", dfs.getUri() + "/" + dir.toString() },
        dir, 0, -1);
    runCommand(dfsAdmin, false, "-setQuota", "1000",
        dfs.getUri() + "/" + dir.toString());

    runCommand(dfsAdmin, false, "-clrQuota",
        dfs.getUri() + "/" + dir.toString());
  }

  private void testSetAndClearSpaceQuotaRegularInternal(
      final String[] args,
      final Path dir,
      final int cmdRet,
      final int spaceQuota) throws Exception {

    resetStream();
    final DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final List<String> outs = Lists.newArrayList();

    final int ret = ToolRunner.run(dfsAdmin, args);
    assertEquals(cmdRet, ret);
    final QuotaUsage quotaUsage = dfs.getQuotaUsage(dir);
    assertEquals(spaceQuota, quotaUsage.getSpaceQuota());
    scanIntoList(OUT_STREAM, outs);
    assertTrue(
        "There should be no output if it runs successfully.",
        outs.isEmpty());
  }

  /**
   * Test to set and clear space quote by storage type.
   */
  @Test(timeout = 30000)
  public void testSetAndClearSpaceQuotaByStorageType() throws Exception {

    final Path dir = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(dir));

    /* set space quota */
    testSetAndClearSpaceQuotaByStorageTypeInternal(
        new String[] {
            "-setSpaceQuota", "2048", "-storageType", "DISK",
            dir.toString()},
        dir,
        0,
        -1,
        2048);

    /* clear space quota */
    testSetAndClearSpaceQuotaByStorageTypeInternal(
        new String[] {
            "-clrSpaceQuota", "-storageType", "DISK",
            dir.toString()},
        dir,
        0,
        -1,
        -1);
  }

  private void testSetAndClearSpaceQuotaByStorageTypeInternal(
      final String[] args,
      final Path dir,
      final int cmdRet,
      final int spaceQuota,
      final int spaceQuotaByStorageType) throws Exception {

    resetStream();
    final DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final List<String> outs = Lists.newArrayList();

    final int ret = ToolRunner.run(dfsAdmin, args);
    assertEquals(cmdRet, ret);
    final QuotaUsage quotaUsage = dfs.getQuotaUsage(dir);
    assertEquals(spaceQuota, quotaUsage.getSpaceQuota());
    assertEquals(
        spaceQuotaByStorageType,
        quotaUsage.getTypeQuota(StorageType.DISK));
    scanIntoList(OUT_STREAM, outs);
    assertTrue(
        "There should be no output if it runs successfully.",
        outs.isEmpty());
  }

  /**
   * Test to set and clear space quote when directory doesn't exist.
   */
  @Test(timeout = 30000)
  public void testSetAndClearSpaceQuotaDirecotryNotExist() throws Exception {
    final Path dir = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());

    /* set space quota */
    testSetAndClearSpaceQuotaDirecotryNotExistInternal(
        new String[] {"-setSpaceQuota", "1024", dir.toString()},
        dir,
        -1,
        "setSpaceQuota");

    /* clear space quota */
    testSetAndClearSpaceQuotaDirecotryNotExistInternal(
        new String[] {"-clrSpaceQuota", dir.toString()},
        dir,
        -1,
        "clrSpaceQuota");
  }

  private void testSetAndClearSpaceQuotaDirecotryNotExistInternal(
      final String[] args,
      final Path dir,
      final int cmdRet,
      final String cmdName) throws Exception {

    resetStream();
    final DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final List<String> outs = Lists.newArrayList();

    final int ret = ToolRunner.run(dfsAdmin, args);
    assertEquals(cmdRet, ret);
    scanIntoList(ERR_STREAM, outs);
    assertEquals(
        "It should be one line error message like: clrSpaceQuota:"
            + " Directory does not exist: <full path of XXX directory>",
        1, outs.size());
    assertThat(outs.get(0),
        is(allOf(containsString(cmdName),
            containsString("does not exist"),
            containsString(dir.toString()))));
  }

  /**
   * Test to set and clear space quote when path is a file.
   */
  @Test (timeout = 30000)
  public void testSetAndClearSpaceQuotaPathIsFile() throws Exception {

    final Path parent = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    final Path file = new Path(parent, "path-is-file");
    DFSTestUtil.createFile(dfs, file, 1024L, (short) 1L, 0);
    assertTrue(dfs.isFile(file));

    /* set space quota */
    testSetAndClearSpaceQuotaPathIsFileInternal(
        new String[] {"-setSpaceQuota", "1024", file.toString()},
        file,
        -1,
        "setSpaceQuota");

    /* clear space quota */
    testSetAndClearSpaceQuotaPathIsFileInternal(
        new String[] {"-clrSpaceQuota", file.toString()},
        file,
        -1,
        "clrSpaceQuota");
  }

  private void testSetAndClearSpaceQuotaPathIsFileInternal(
      final String[] args,
      final Path file,
      final int cmdRet,
      final String cmdName) throws Exception {

    resetStream();
    final DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final List<String> outs = Lists.newArrayList();

    final int ret = ToolRunner.run(dfsAdmin, args);
    assertEquals(cmdRet, ret);
    scanIntoList(ERR_STREAM, outs);
    assertEquals(
        "It should be one line error message like: clrSpaceQuota:"
            + " <full path of XXX file> is not a directory",
        1, outs.size());
    assertThat(outs.get(0),
        is(allOf(containsString(cmdName),
            containsString(file.toString()),
            containsString("Is not a directory"))));
  }

  /**
   * Test to set and clear space quote when user has no access right.
   */
  @Test(timeout = 30000)
  public void testSetAndClearSpaceQuotaNoAccess() throws Exception {

    final Path dir = new Path(
        PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(dir));

    /* set space quota */
    testSetAndClearSpaceQuotaNoAccessInternal(
        new String[] {"-setSpaceQuota", "2048", dir.toString()},
        -1,
        "setSpaceQuota");

    /* clear space quota */
    testSetAndClearSpaceQuotaNoAccessInternal(
        new String[] {"-clrSpaceQuota", dir.toString()},
        -1,
        "clrSpaceQuota");
  }

  @Test
  public void testSpaceQuotaExceptionOnClose() throws Exception {
    GenericTestUtils.setLogLevel(DFSOutputStream.LOG, Level.TRACE);
    GenericTestUtils.setLogLevel(DataStreamer.LOG, Level.TRACE);
    final DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final Path dir = new Path(PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(dir));
    final String[] args = new String[] {"-setSpaceQuota", "1", dir.toString()};
    assertEquals(0, ToolRunner.run(dfsAdmin, args));

    final Path testFile = new Path(dir, "file");
    final FSDataOutputStream stream = dfs.create(testFile);
    stream.write("whatever".getBytes());
    try {
      stream.close();
      fail("close should fail");
    } catch (DSQuotaExceededException expected) {
    }

    assertEquals(0, cluster.getNamesystem().getNumFilesUnderConstruction());
  }

  @Test
  public void testSpaceQuotaExceptionOnFlush() throws Exception {
    GenericTestUtils.setLogLevel(DFSOutputStream.LOG, Level.TRACE);
    GenericTestUtils.setLogLevel(DataStreamer.LOG, Level.TRACE);
    GenericTestUtils.setLogLevel(DFSClient.LOG, Level.TRACE);
    final DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final Path dir = new Path(PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    assertTrue(dfs.mkdirs(dir));
    final String[] args = new String[] {"-setSpaceQuota", "1", dir.toString()};
    assertEquals(0, ToolRunner.run(dfsAdmin, args));

    Path testFile = new Path(dir, "file");
    FSDataOutputStream stream = dfs.create(testFile);
    // get the lease renewer now so we can verify it later without calling
    // getLeaseRenewer, which will automatically add the client into it.
    final LeaseRenewer leaseRenewer = dfs.getClient().getLeaseRenewer();
    stream.write("whatever".getBytes());
    try {
      stream.hflush();
      fail("flush should fail");
    } catch (DSQuotaExceededException expected) {
    }
    // even if we close the stream in finially, it won't help.
    try {
      stream.close();
      fail("close should fail too");
    } catch (DSQuotaExceededException expected) {
    }

    GenericTestUtils.setLogLevel(LeaseRenewer.LOG, Level.TRACE);
    GenericTestUtils.waitFor(new Supplier<Boolean>() {
      @Override
      public Boolean get() {
        LOG.info("LeaseRenewer: {}", leaseRenewer);
        return leaseRenewer.isEmpty();
      }
    }, 100, 10000);
    assertEquals(0, cluster.getNamesystem().getNumFilesUnderConstruction());
  }

  @Test
  public void testSpaceQuotaExceptionOnAppend() throws Exception {
    GenericTestUtils.setLogLevel(DFSOutputStream.LOG, Level.TRACE);
    GenericTestUtils.setLogLevel(DataStreamer.LOG, Level.TRACE);
    final DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final Path dir = new Path(PathUtils.getTestPath(getClass()),
        GenericTestUtils.getMethodName());
    dfs.delete(dir, true);
    assertTrue(dfs.mkdirs(dir));
    final String[] args =
        new String[] {"-setSpaceQuota", "4000", dir.toString()};
    ToolRunner.run(dfsAdmin, args);

    final Path testFile = new Path(dir, "file");
    OutputStream stream = dfs.create(testFile);
    stream.write("whatever".getBytes());
    stream.close();

    assertEquals(0, cluster.getNamesystem().getNumFilesUnderConstruction());

    stream = dfs.append(testFile);
    byte[] buf = AppendTestUtil.initBuffer(4096);
    stream.write(buf);
    try {
      stream.close();
      fail("close after append should fail");
    } catch (DSQuotaExceededException expected) {
    }
    assertEquals(0, cluster.getNamesystem().getNumFilesUnderConstruction());
  }

  private void testSetAndClearSpaceQuotaNoAccessInternal(
      final String[] args,
      final int cmdRet,
      final String cmdName) throws Exception {

    resetStream();
    final DFSAdmin dfsAdmin = new DFSAdmin(conf);
    final List<String> outs = Lists.newArrayList();

    final UserGroupInformation whoever =
        UserGroupInformation.createUserForTesting(
            "whoever",
            new String[] {"whoever_group"});

    final int ret = whoever.doAs(new PrivilegedExceptionAction<Integer>() {
      @Override
      public Integer run() throws Exception {
        return ToolRunner.run(dfsAdmin, args);
      }
    });
    assertEquals(cmdRet, ret);
    scanIntoList(ERR_STREAM, outs);
    assertThat(outs.get(0),
        is(allOf(containsString(cmdName),
            containsString("Access denied for user whoever"),
            containsString("Superuser privilege is required"))));
  }

  private static void scanIntoList(
      final ByteArrayOutputStream baos,
      final List<String> list) {
    final Scanner scanner = new Scanner(baos.toString());
    while (scanner.hasNextLine()) {
      list.add(scanner.nextLine());
    }
    scanner.close();
  }
}
