Kihwal Lee created MAPREDUCE-7177:
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Summary: Disable speculative execution in TestDFSIO
Key: MAPREDUCE-7177
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7177
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 2.8.5, 3.2.0
Reporter: Kihwal Lee
When TestDFSIO runs in a certain environment where a subset of mappers are
slow, the speculative execution can start. In the write phase, this will make
existing mapper to fail in next addBlock() since the output files are
overwritten.
To make the benchmark more predictable and repeatable, speculation must be
implicitly disabled in TestDFSIO itself.
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