Nathan Roberts created TEZ-3440:
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Summary: 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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