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Some job events may have bad metrics (e.g. totalMappers) #83
Some job events may be including bad job metrics. Once example we've seen is totalMappers, totalReducers: Sometimes values for these metrics will be reported as zero in events towards the end of a job's execution. This may be due to an issue with the PPNL impl not properly collecting this data for some events.
Note that the client UI could be updated to simply avoid overwriting non-zero metric values with zeros, though this may not be the best solution for non-monotonically increasing job metrics (are there any? perhaps this is not an issue?).