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Yu Li commented on HBASE-19389: ------------------------------- Ah I see, you meant the {{hbase.region.store.parallel.put.print.threshold}} property which is for controlling the log frequency. Yes this is default by 50 but not mentioned in the release note (in RN we only introduce {{hbase.region.store.parallel.put.limit}}). And yes personally I think we could directly use {{hbase.region.store.parallel.put.limit}} as the print limit instead of introducing a new property, unless the new property supports online configuration change for more flexible debugging. [~stack] > 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 > Priority: Critical > Fix For: 3.0.0, 2.1.0 > > Attachments: CSLM-concurrent-write.png, > HBASE-19389-branch-2-V10.patch, 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-V8.patch, > HBASE-19389-branch-2-V9.patch, HBASE-19389-branch-2.patch, > HBASE-19389.master.patch, HBASE-19389.master.v2.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 (v7.6.3#76005)