Varun Sharma created HBASE-7295:
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Summary: Contention in HBaseClient.getConnection
Key: HBASE-7295
URL: https://issues.apache.org/jira/browse/HBASE-7295
Project: HBase
Issue Type: Improvement
Affects Versions: 0.94.3
Reporter: Varun Sharma
Assignee: Varun Sharma
HBaseClient.getConnection() synchronizes on the connections object. We found
severe contention on a thrift gateway which was fanning out roughly 3000+ calls
per second to hbase region servers. The thrift gateway had 2000+ threads for
handling incoming connections. Threads were blocked on the syncrhonized block -
we set ipc.pool.size to 200. Since we are using RoundRobin/ThreadLocal pool
only - its not necessary to synchronize on connections - it might lead to cases
where we might go slightly over the ipc.max.pool.size() but the additional
connections would timeout after maxIdleTime - underlying PoolMap connections
object is thread safe.
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