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https://issues.apache.org/jira/browse/MAPREDUCE-6735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15384298#comment-15384298
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Jason Lowe commented on MAPREDUCE-6735:
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Oops I apologize, I'm referencing the wrong JIRA. HADOOP-12958 is the one that
fixed the phantom references in HADOOP-12107, not HADOOP-12706. So everywhere
above that I've been calling out HADOOP-12706 I really meant HADOOP-12958.
That's the JIRA that changed the PhantomReferences introduced in HADOOP-12107
into weak references, and that ended up being a significant fix for container
reuse in Tez.
> Performance degradation caused by MAPREDUCE-5465 and HADOOP-12107
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-6735
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6735
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Alexandr Balitsky
>
> Two commits, MAPREDUCE-5465 and HADOOP-12107 are making Terasort on YARN 10%
> slower.
> Reduce phase with those commits ~5 mins
> Reduce phase without ~3.5 mins
> Average Reduce is taking 4mins, 16sec with those commits compared to 3mins,
> 48sec without.
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