## 2.6.10 – May 19, 2015 

• Improve user cache invalidation enforcement on mongos SERVER-11980 616 

• Provide correct rollbacks for collection creation SERVER-18211 617 

• Allow user inserts into the system.profile collection SERVER-18211 618 

• Fix to query system to ensure non-negation predicates get chosen over negation predicates for multikey index bounds construction SERVER-18364 619 

• All issues closed in 2.6.10 620 

## 2.6.9 – March 24, 2015 

• Resolve connection handling related crash with mongos instances SERVER-17441 621 

• Add server parameter to configure idle cursor timeout SERVER-8188 622 

• Remove duplicated (orphan) documents from aggregation pipelines with _id queries in sharded clusters SERVER-17426 623 

• Fixed crash in geoNear queries with multiple 2dsphere indexes SERVER-14723 624 

• All issues closed in 2.6.9 625 

## 2.6.8 – February 25, 2015 

• Add listCollections command functionality to 2.6 shell and client SERVER-17087 626 

• copydb / clone commands can crash the server if a primary steps down SERVER-16599 627 

• Secondary fasserts trying to replicate an index SERVER-16274 628 

• Query optimizer should always use equality predicate over unique index when possible SERVER-15802 629 

• All issues closed in 2.6.8 630 

## 2.6.7 – January 13, 2015 

• Decreased mongos memory footprint when shards have several tags SERVER-16683 631 

• Removed check for shard version if the primary server is down SERVER-16237 632 

