[jira] [Updated] (TEZ-3440) Shuffling to memory can get out-of-sync when fetching multiple compressed map outputs

["Nathan Roberts (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-3440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nathan Roberts updated TEZ-3440:
--------------------------------
    Attachment: TEZ-3440-v1.patch

> 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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