[jira] [Created] (HBASE-17033) LogRoller makes a lot of allocations unnecessarily

["Enis Soztutar (JIRA)" <ji...@apache.org>]

Enis Soztutar created HBASE-17033:
-------------------------------------

             Summary: LogRoller makes a lot of allocations unnecessarily
                 Key: HBASE-17033
                 URL: https://issues.apache.org/jira/browse/HBASE-17033
             Project: HBase
          Issue Type: Bug
            Reporter: Enis Soztutar
            Assignee: Enis Soztutar


I was looking at the other allocations for HBASE-17017. Seems that log roller thread allocates 200MB for ~7% of the TLAB space. This is a lot of allocations. 

I think the reason is this: 
{code}
while (true) {
        if (this.safePointAttainedLatch.await(1, TimeUnit.NANOSECONDS)) {
          break;
        }
        if (syncFuture.isThrowable()) {
          throw new FailedSyncBeforeLogCloseException(syncFuture.getThrowable());
        }
      }
{code}

This busy wait is causing a lot allocations because the thread is added to the waiting list. 



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