[jira] [Created] (HBASE-15319) clearJmxCache does not take effect actually

["Hao Lin (JIRA)" <ji...@apache.org>]

Hao Lin created HBASE-15319:
-------------------------------

             Summary: clearJmxCache does not take effect actually
                 Key: HBASE-15319
                 URL: https://issues.apache.org/jira/browse/HBASE-15319
             Project: HBase
          Issue Type: Bug
          Components: metrics
    Affects Versions: 1.1.0.1
            Reporter: Hao Lin


When trying to backport HBASE-14166 to 0.98.6, I find JmxCacheBuster::clearJmxCache() does no take effect actually. The related code are listed below:

{code:title=org.apache.hadoop.metrics2.impl.JmxCacheBuster.java|borderStyle=solid}
// fut is initialized to null
private static AtomicReference<ScheduledFuture> fut = new AtomicReference<>(null);

public static void clearJmxCache() {
    // clearJmxCache return directly when fut is null, which is always true.
    // the actual intent is 'if (future != null && !future.isDone ...)' ?
    ScheduledFuture future = fut.get();
    if ((future == null || (!future.isDone() && future.getDelay(TimeUnit.MILLISECONDS) > 100))) {
      return;
    }
    ......
}
{code}



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