[ https://issues.apache.org/jira/browse/HBASE-19389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16285326#comment-16285326 ]
Chance Li commented on HBASE-19389: ----------------------------------- sorry for the UT error. update patch HBASE-19389-branch-2-V7.patch , and run UT again > Limit concurrency of put with dense (hundreds) columns to prevent write > handler exhausted > ----------------------------------------------------------------------------------------- > > Key: HBASE-19389 > URL: https://issues.apache.org/jira/browse/HBASE-19389 > Project: HBase > Issue Type: Improvement > Components: Performance > Affects Versions: 2.0.0 > Environment: 2000+ Region Servers > PCI-E ssd > Reporter: Chance Li > Assignee: Chance Li > Fix For: 2.0.0 > > Attachments: CSLM-concurrent-write.png, > HBASE-19389-branch-2-V2.patch, HBASE-19389-branch-2-V3.patch, > HBASE-19389-branch-2-V4.patch, HBASE-19389-branch-2-V5.patch, > HBASE-19389-branch-2-V6.patch, HBASE-19389-branch-2-V7.patch, > HBASE-19389-branch-2.patch, metrics-1.png, ycsb-result.png > > > In a large cluster, with a large number of clients, we found the RS's > handlers are all busy sometimes. And after investigation we found the root > cause is about CSLM, such as compare function heavy load. We reviewed the > related WALs, and found that there were many columns (more than 1000 columns) > were writing at that time. -- This message was sent by Atlassian JIRA (v6.4.14#64029)