Allow TT to run children with an elevated oom_adj score
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Key: MAPREDUCE-3150
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3150
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: mrv2, task-controller
Affects Versions: 0.20.206.0, 0.23.0
Reporter: Todd Lipcon
Some users of hadoop have run into issues where memory on the machines gets
oversubscribed for various reasons. When this happens, the machines enter swap,
causing things like timeouts, HBase aborts, etc. One mitigation strategy among
many is to run the machines without swap, and allow the linux OOM killer to
kill tasks. However, this is dangerous if the OOM killer might kill the TT, RS,
DN, etc. We can set the {{oom_adj}} value in proc for the MR children in order
to encourage the oom killer to kill the right thing.
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