Improve recovery time of HBase client when a region server dies.
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Key: HBASE-4785
URL: https://issues.apache.org/jira/browse/HBASE-4785
Project: HBase
Issue Type: Improvement
Reporter: Nicolas Spiegelberg
Assignee: Nicolas Spiegelberg
Priority: Minor
Fix For: 0.94.0
When a region server dies, the HBase client waits until the RPC timesout before
learning that it needs to check META to find the new location of the region.
And it incurs this *timeout* cost for every region being served by the dead
region server. Remove this overhead by clearing the entries in cache that have
the dead region server as their values.
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