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From "huaxiang sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18004) getRegionLocations needs to be called once in ScannerCallableWithReplicas#call()
Date Fri, 09 Jun 2017 18:17:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16044794#comment-16044794
] 

huaxiang sun commented on HBASE-18004:
--------------------------------------

Thanks [~tedyu]. I will do a rebase and do as you suggested.

> 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
>         Attachments: HBASE-18004-master-001.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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