[jira] [Created] (PHOENIX-6548) Race condition when triggering index rebuilds as regionserver closes

["Geoffrey Jacoby (Jira)" <ji...@apache.org>]

Geoffrey Jacoby created PHOENIX-6548:
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             Summary: Race condition when triggering index rebuilds as regionserver closes
                 Key: PHOENIX-6548
                 URL: https://issues.apache.org/jira/browse/PHOENIX-6548
             Project: Phoenix
          Issue Type: Bug
    Affects Versions: 4.16.1, 4.14.3
            Reporter: Geoffrey Jacoby


On each regionserver our coprocs keep a cache of HConnections with custom settings (such as short timeouts) for talking to other regionservers. They're used when coprocs need to make RPCs, such as during index rebuilds. 

When a regionserver is closed, these HConnections are closed as well. However, we've seen in our test pipelines a race condition where we may have just given out one of the HConnections to a coprocessor, only to have the connection closed just before it's used. 

This will produce an IllegalArgumentException from the HBase Table object, which (if the index rebuild was caused by a client Scan) will be thrown back to the client as a DoNotRetryIOException.

In this case we want the client exception to be a normal retriable IOException, because if they try again after the region comes up again somewhere else, the Scan will likely succeed. 



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