Add job-level counters for the launched speculative tasks
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Key: HADOOP-2354
URL: https://issues.apache.org/jira/browse/HADOOP-2354
Project: Hadoop
Issue Type: Improvement
Components: mapred
Reporter: Arun C Murthy
Assignee: Arun C Murthy
Fix For: 0.16.0
Add job-level counters for the launched speculative tasks, this should help
track them.
Ideally we would also have counters to check how many of the speculative tasks
completed before the original task (thereby helps validate the strategy for
launching speculative tasks), however we do not have this infrastructure yet
(HADOOP-544) - so I'll file a follow-on bug for that feature.
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