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https://issues.apache.org/jira/browse/HBASE-17033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15639216#comment-15639216
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Anoop Sam John commented on HBASE-17033:
----------------------------------------
Looks good.
> 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
> Attachments: Screen Shot 2016-11-04 at 6.39.00 PM.png,
> hbase-17033_v1.patch
>
>
> 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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