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Lars Hofhansl commented on HBASE-4970: -------------------------------------- About to commit. What do we do with the CHANGES.txt file now. This is a 0.90 change, so I want to add it to the 0.90 section in trunk and 0.92 as well. They still have 0.90.5 marked as unreleased. In 0.90 there is a 0.90.6 entry also marked as unreleased (in addition to 0.90.5, which is also marked as unreleased). Should I add a 0.90.6 row in 0.92 in trunk? > Add a parameter so that keepAliveTime of Htable thread pool can be changed > -------------------------------------------------------------------------- > > Key: HBASE-4970 > URL: https://issues.apache.org/jira/browse/HBASE-4970 > Project: HBase > Issue Type: Improvement > Components: client > Affects Versions: 0.90.4 > Reporter: gaojinchao > Assignee: gaojinchao > Priority: Trivial > Fix For: 0.90.6 > > Attachments: HBASE-4970_Branch90.patch, > HBASE-4970_Branch90_V1_trial.patch, HBASE-4970_Branch90_V2.patch, > HBASE-4970_Branch92_V2.patch, HBASE-4970_Trunk_V2.patch > > > In my cluster, I changed keepAliveTime from 60 s to 3600 s. Increasing RES > is slowed down. > Why increasing keepAliveTime of HBase thread pool is slowing down our problem > occurance [RES value increase]? > You can go through the source of sun.nio.ch.Util. Every thread hold 3 > softreference of direct buffer(mustangsrc) for reusage. The code names the 3 > softreferences buffercache. If the buffer was all occupied or none was > suitable in size, and new request comes, new direct buffer is allocated. > After the service, the bigger one replaces the smaller one in buffercache. > The replaced buffer is released. > So I think we can add a parameter to change keepAliveTime of Htable thread > pool. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira