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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18004) getRegionLocations needs to be called once in ScannerCallableWithReplicas#call()
Date Thu, 15 Jun 2017 22:06:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16051143#comment-16051143
] 

Hudson commented on HBASE-18004:
--------------------------------

FAILURE: Integrated in Jenkins build HBase-2.0 #49 (See [https://builds.apache.org/job/HBase-2.0/49/])
HBASE-18004 getRegionLocations needs to be called once in (stack: rev 4184ae75633bb41ba85c640c3981e2b436d46829)
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
* (edit) hbase-client/src/main/java/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.java


> getRegionLocations  needs to be called once in ScannerCallableWithReplicas#call()
> ---------------------------------------------------------------------------------
>
>                 Key: HBASE-18004
>                 URL: https://issues.apache.org/jira/browse/HBASE-18004
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client
>    Affects Versions: 2.0.0
>            Reporter: huaxiang sun
>            Assignee: huaxiang sun
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: HBASE-18004-master-001.patch, HBASE-18004-master-002.patch
>
>
> Look at this line,
> https://github.com/apache/hbase/blob/master/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.java#L145
> It calls getRegionLocations() to get the primary region's locations. It's usage is to
figure out table's region replications. Since table's region replication wont be changed until
the table is disabled. It is safe to cache this region replication.



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