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From "Yeonseop Kim (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3553) Zookeeper connection should be closed immediately after DefaultStatisticsCollector's collecting stats done
Date Wed, 04 Jan 2017 08:52:58 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15797646#comment-15797646
] 

Yeonseop Kim commented on PHOENIX-3553:
---------------------------------------

Scheduled major compaction is disabled(hbase.hregion.majorcompaction = 0).
One possible scenario is "all files in Store selection" case. In this case, HBase treats minor
compaction as a major compaction.

> Zookeeper connection should be closed immediately after DefaultStatisticsCollector's
collecting stats done
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-3553
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3553
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.9.0
>            Reporter: Yeonseop Kim
>              Labels: stats, zookeeper
>             Fix For: 4.10.0
>
>         Attachments: PHOENIX-3553.patch
>
>
> In every minor compaction job of HBase,
> org.apache.phoenix.schema.stats.DefaultStatisticsCollector.initGuidePostDepth() is called,
> and SYSTEM.CATALOG table is open to get guidepost width via
> htable = env.getTable(
>                  SchemaUtil.getPhysicalTableName(PhoenixDatabaseMetaData.SYSTEM_CATALOG_NAME_BYTES,
env.getConfiguration()));
> This function call creates one zookeeper connection to get cluster id.
> DefaultStatisticsCollector doesn't close this zookeeper connection immediately after
get guidepost width, and the zookeeper connection remains alive until HRegion is closed.
> This is not a problem with small number of Regions, but when number of Region is large
and upsert operation is frequent, the number of zookeeper connection gradually increases 
to hundreds, and the zookeeper server nodes experience  short of available TCP/IP ports.
> This zookeeper connection should be closed immediately after get guidepost width.



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