Hitesh Shah commented on TEZ-3440:

\cc [~rajesh.balamohan] [~sseth]

> 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
> 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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