Fix two bugs in v2.app.speculate.DataStatistics
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Key: MAPREDUCE-2642
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2642
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Components: mrv2
Reporter: Josh Wills
Assignee: Josh Wills
Priority: Minor
Fixes two bugs in DataStatistics: a divide by zero in the variance calculation
when count == 0, and a synchronization issue in how the updateStatistics method
was implemented.
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