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stack commented on HBASE-4633: ------------------------------ bq. Default -XXMaxDirectMemorySize value is equal to -Xmx value.... According to this, http://stackoverflow.com/questions/3773775/default-for-xxmaxdirectmemorysize, default max is 64M (which is still too big). Should we set this to 1M as our default? > Potential memory leak in client RPC timeout mechanism > ----------------------------------------------------- > > Key: HBASE-4633 > URL: https://issues.apache.org/jira/browse/HBASE-4633 > Project: HBase > Issue Type: Bug > Components: client > Affects Versions: 0.90.3 > Environment: HBase version: 0.90.3 + Patches , Hadoop version: CDH3u0 > Reporter: Shrijeet Paliwal > Attachments: HBaseclientstack.png > > > Relevant Jiras: https://issues.apache.org/jira/browse/HBASE-2937, > https://issues.apache.org/jira/browse/HBASE-4003 > We have been using the 'hbase.client.operation.timeout' knob > introduced in 2937 for quite some time now. It helps us enforce SLA. > We have two HBase clusters and two HBase client clusters. One of them > is much busier than the other. > We have seen a deterministic behavior of clients running in busy > cluster. Their (client's) memory footprint increases consistently > after they have been up for roughly 24 hours. > This memory footprint almost doubles from its usual value (usual case > == RPC timeout disabled). After much investigation nothing concrete > came out and we had to put a hack > which keep heap size in control even when RPC timeout is enabled. Also > note , the same behavior is not observed in 'not so busy > cluster. > The patch is here : https://gist.github.com/1288023 -- 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