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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15658) RegionServerCallable / RpcRetryingCaller clear meta cache on retries
Date Fri, 15 Apr 2016 01:24:25 GMT
Gary Helmling created HBASE-15658:
-------------------------------------

             Summary: RegionServerCallable / RpcRetryingCaller clear meta cache on retries
                 Key: HBASE-15658
                 URL: https://issues.apache.org/jira/browse/HBASE-15658
             Project: HBase
          Issue Type: Sub-task
          Components: Client
    Affects Versions: 1.2.1
            Reporter: Gary Helmling
            Priority: Critical


When RpcRetryingCaller.callWithRetries() attempts a retry, it calls RetryingCallable.prepare(tries
!= 0).  For RegionServerCallable (and probably others), this will wind up calling RegionLocator.getRegionLocation(reload=true),
which will drop the meta cache for the given region and always go back to meta.

This is kind of silly, since in the case of exceptions, we already call RetryingCallable.throwable(),
which goes to great pains to only refresh the meta cache when necessary.  Since we are already
doing this on failure, I don't really understand why we are doing duplicate work to refresh
the meta cache on prepare() at all.



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