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Hudson commented on HBASE-19389: -------------------------------- Results for branch HBASE-19064 [build #77 on builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/HBASE-19064/77/]: (x) *{color:red}-1 overall{color}* ---- details (if available): (x) {color:red}-1 general checks{color} -- For more information [see general report|https://builds.apache.org/job/HBase%20Nightly/job/HBASE-19064/77//General_Nightly_Build_Report/] (x) {color:red}-1 jdk8 hadoop2 checks{color} -- For more information [see jdk8 (hadoop2) report|https://builds.apache.org/job/HBase%20Nightly/job/HBASE-19064/77//JDK8_Nightly_Build_Report_(Hadoop2)/] (x) {color:red}-1 jdk8 hadoop3 checks{color} -- For more information [see jdk8 (hadoop3) report|https://builds.apache.org/job/HBase%20Nightly/job/HBASE-19064/77//JDK8_Nightly_Build_Report_(Hadoop3)/] (/) {color:green}+1 source release artifact{color} -- See build output for details. > 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)