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Hudson commented on HBASE-22422: -------------------------------- Results for branch branch-2 [build #2029 on builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/branch-2/2029/]: (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/branch-2/2029//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/branch-2/2029//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/branch-2/2029//JDK8_Nightly_Build_Report_(Hadoop3)/] (/) {color:green}+1 source release artifact{color} -- See build output for details. (/) {color:green}+1 client integration test{color} > Retain an ByteBuff with refCnt=0 when getBlock from LRUCache > ------------------------------------------------------------ > > Key: HBASE-22422 > URL: https://issues.apache.org/jira/browse/HBASE-22422 > Project: HBase > Issue Type: Sub-task > Components: BlockCache > Reporter: Zheng Hu > Assignee: Zheng Hu > Priority: Major > Attachments: 0001-debug2.patch, 0001-debug2.patch, 0001-debug2.patch, > 0001-debug3.patch, 0001-debug4.patch, > HBASE-22422-qps-after-fix-the-zero-retain-bug.png, > HBASE-22422.HBASE-21879.v01.patch, HBASE-22422.HBASE-21879.v02.patch, > LRUBlockCache-getBlock.png, debug.patch, > failed-to-check-positive-on-web-ui.png, image-2019-05-15-12-00-03-641.png > > > After runing YCSB scan/get benchmark in our XiaoMi cluster, we found the get > QPS dropped from 25000/s to hunderds per second in a cluster with five > nodes. > After enable the debug log at YCSB client side, I found the following > stacktrace , see > https://issues.apache.org/jira/secure/attachment/12968745/image-2019-05-15-12-00-03-641.png. > > After looking into the stractrace, I can ensure that the zero refCnt block is > an intermedia index block, see [2] http://hbase.apache.org/images/hfilev2.png > Need a patch to fix this. -- This message was sent by Atlassian JIRA (v7.6.3#76005)