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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HBASE-18004) getRegionLocations needs to be called once in ScannerCallableWithReplicas#call()
Date Sat, 17 Jun 2017 04:58:01 GMT

     [ https://issues.apache.org/jira/browse/HBASE-18004?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack reopened HBASE-18004:
---------------------------

Reopen for branch-1 patch.

> 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.branch-1.001.patch, 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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