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https://issues.apache.org/jira/browse/HBASE-18004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16051004#comment-16051004
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huaxiang sun commented on HBASE-18004:
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Thanks Stack. I think it is good for master and branch-1.
> 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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