[HBASE-13437] ThriftServer leaks ZooKeeper connections

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.98.8
• Fix Version/s: 1.1.0, 0.98.13, 1.0.2, 2.0.0
• Component/s: Thrift
• Hadoop Flags: Reviewed
• Assignee: Albert Strasheim
• Reporter: Winger Pun
• Created: 09/Apr/15 06:53
• Updated: 28/Jan/16 15:14
• Resolved: 22/Apr/15 16:01

Description

HBase ThriftServer will cache Zookeeper connection in memory using org.apache.hadoop.hbase.util.ConnectionCache. This class has a mechanism called chore to clean up connections idle for too long(default is 10 min). But method timedOut for testing whether idle exceed for maxIdleTime always return false which leads to never release the Zookeeper connection. If we send request to ThriftServer every maxIdleTime then ThriftServer will keep thousands of Zookeeper Connection soon.