[jira] [Created] (HBASE-9768) Two issues in AsyncProcess

["Jeffrey Zhong (JIRA)" <ji...@apache.org>]

Jeffrey Zhong created HBASE-9768:
------------------------------------

             Summary: Two issues in AsyncProcess
                 Key: HBASE-9768
                 URL: https://issues.apache.org/jira/browse/HBASE-9768
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.96.0
            Reporter: Jeffrey Zhong
            Assignee: Nicolas Liochon
             Fix For: 0.98.0, 0.96.1


There may exist two issues in Asyncprocess code as following:

1)  In Htable#backgroundFlushCommits, we have following code:

{code}
      if (ap.hasError()) {
        if (!clearBufferOnFail) {
          // if clearBufferOnFailed is not set, we're supposed to keep the failed operation in the
          //  write buffer. This is a questionable feature kept here for backward compatibility
          writeAsyncBuffer.addAll(ap.getFailedOperations());
        }
        RetriesExhaustedWithDetailsException e = ap.getErrors();
        ap.clearErrors();
        throw e;
      }
{code}

In a rare situation like the following: 
When there are some updates ongoing, a client call Put(internally backgroundFlushCommits get triggered). Then comes the issue:
The first ap.hasError() returns false and the second ap.hasError() returns true. So we could throw exception to caller while writeAsyncBuffer isn't empty.(some updates are still on going).
If a client retry with different values for the same keys, we could end up with nondeterministic state.

2) The following code only update cache for the first row. We should update cache for all the regions inside resultForRS because actions are sent to multiple regions per RS

{code}
          if (failureCount++ == 0) { // We're doing this once per location.
            hConnection.updateCachedLocations(this.tableName, row.getRow(), result, location);
            if (errorsByServer != null) {
              errorsByServer.reportServerError(location);
              canRetry = errorsByServer.canRetryMore();
            }
          }
{code}




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