title: Kafka connector (HDFS SINK) not working after initial update
body: <p>We are using kafka 0.10.2.0 and trying to use HDFS Sink connector to push the data from Kafka to HDFS. This succeeds only for the first time and after that no update is happening. Also, the Kafka standalone connector log has:</p>
  
  <pre><code>[2017-09-01 19:20:03,030] INFO WorkerSinkTask{id=hdfs-sinks-0} Committing offsets (org.apache.kafka.connect.runtime.WorkerSinkTask:272)
  [2017-09-01 19:20:03,034] WARN Commit of WorkerSinkTask{id=hdfs-sinks-0} offsets timed out (org.apache.kafka.connect.runtime.WorkerSinkTask:172)
  </code></pre>
  
  <p>Below are the properties added as suggested in one of the forums.</p>
  
  <pre><code>name=hdfs-sinks 
  connector.class=io.confluent.connect.hdfs.HdfsSinkConnector 
  tasks.max=1 
  topics=mysql-author 
  hdfs.url=hdfs://quickstart.cloudera:8020 
  flush.size=3 
  logs.dir=/hdfs_directory/data/log 
  request.timeout.ms=310000 
  offset.flush.interval.ms=5000 
  heartbeat.interval.ms=60000 
  session.timeout.ms=300000 
  max.poll.records=100 
  </code></pre>
  
  <p>Connector Config: </p>
  
  <pre><code>offset.storage.file.filename=/tmp/connect.offsets  
  offset.flush.interval.ms=120000 
  offset.flush.timeout.ms=60000 
  buffer.memory=100
  </code></pre>