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Posted to issues@hbase.apache.org by "Nick Dimiduk (Jira)" <ji...@apache.org> on 2020/01/23 17:30:00 UTC
[jira] [Updated] (HBASE-22422) Retain an ByteBuff with refCnt=0
when getBlock from LRUCache
[ https://issues.apache.org/jira/browse/HBASE-22422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Nick Dimiduk updated HBASE-22422:
---------------------------------
Fix Version/s: 2.3.0
3.0.0
> 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
> Fix For: 3.0.0, 2.3.0
>
> 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.
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