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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17033) LogRoller makes a lot of allocations unnecessarily
Date Sat, 05 Nov 2016 01:38:58 GMT
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: 
while (true) {
        if (this.safePointAttainedLatch.await(1, TimeUnit.NANOSECONDS)) {
        if (syncFuture.isThrowable()) {
          throw new FailedSyncBeforeLogCloseException(syncFuture.getThrowable());

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

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