MR-279: Fixup the exponentially smoothed runtime estimator, fix a couple of
bugs in DataStatistics, and do a little bit of cleanup.
-----------------------------------------------------------------------------------------------------------------------------------
Key: MAPREDUCE-2639
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2639
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: mrv2
Environment: All
Reporter: Josh Wills
Assignee: Josh Wills
Priority: Minor
Attachments: MAPREDUCE-2639.patch
A catch-all JIRA for a pass I took through the v2.app.speculate package.
1) Fixed the ExponentiallySmoothedTaskRuntimeEstimator so that it can run and
pass the test defined in TestRuntimeEstimators.
2) Fixed two bugs in DataStatistics: 1) a divide by zero in the variance
calculation in the case that count == 0 and 2) a synchronization issue in how
the updateStatistics method was implemented,
3) A bunch of typo corrections, formatting fixes, and adding some consistency
around the null value checking.
I probably need to do a couple more passes through this code to get it into
better shape, but this seemed like a good start. Will attach my patch
momentarily.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
