Provide a mechanism to pause the jobtracker
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Key: MAPREDUCE-828
URL: https://issues.apache.org/jira/browse/MAPREDUCE-828
Project: Hadoop Map/Reduce
Issue Type: New Feature
Components: jobtracker
Reporter: Hemanth Yamijala
We've seen scenarios when we have needed to stop the namenode for a maintenance
activity. In such scenarios, if the jobtracker (JT) continues to run, jobs
would fail due to initialization or task failures (due to DFS). We could
restart the JT enabling job recovery, during such scenarios. But restart has
proved to be a very intrusive activity, particularly if the JT is not at fault
itself and does not require a restart. The ask is for a admin-controlled
feature to pause the JT which would take it to a state somewhat analogous to
the safe mode of DFS.
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