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https://issues.apache.org/jira/browse/TEZ-3440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15546465#comment-15546465
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Jonathan Eagles commented on TEZ-3440:
--------------------------------------
+1 pending Hadoop QA. Planning on putting this in 0.8 and 0.7 lines as this is
a critical bug needed there as well.
> Shuffling to memory can get out-of-sync when fetching multiple compressed map
> outputs
> -------------------------------------------------------------------------------------
>
> Key: TEZ-3440
> URL: https://issues.apache.org/jira/browse/TEZ-3440
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Nathan Roberts
> Assignee: Nathan Roberts
> Attachments: TEZ-3440-v1.patch, TEZ-3440.patch
>
>
> Haven't verified yet but certainly looks like tez needs same fix as
> MAPREDUCE-5308 in IFile.
> Specifically saw this because downstream tasks were reporting enough fetch
> failures that long-running upstream tasks had to be re-run, which makes job
> run for much longer than it needs.
> Usually shows itself as an "Invalid map id" error on a multi-map fetch on
> part 2-n (i.e. never the first one).
>
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