[jira] [Updated] (HBASE-18004) getRegionLocations needs to be called once in ScannerCallableWithReplicas#call()

["huaxiang sun (JIRA)" <ji...@apache.org>]

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

huaxiang sun updated HBASE-18004:
---------------------------------
    Attachment: HBASE-18004-master-002.patch

Rebase based on the latest code and removed an unused import in HRegionServer to trig the tests in Server module.

> 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, 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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