huaxiang sun created HBASE-18004:
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Summary: 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
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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