[SPARK-733] Add documentation on use of accumulators in lazy transformation#4022

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ilganeli wants to merge 10 commits intoapache:masterfrom

ilganeli:SPARK-733

Commits on Jan 7, 2015

Partially updated task metrics to make some vars private
Ilya Ganelin
committed
Completed refactoring to make vars in TaskMetrics class private
Ilya Ganelin
committed

Commits on Jan 8, 2015

Updated documentation for accumulators to highlight lazy evaluation issue
Ilya Ganelin
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Added code examples for java and python
Ilya Ganelin
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Commits on Jan 9, 2015

Verified documentation update by building via jekyll
Ilya Ganelin
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Merge remote-tracking branch 'upstream/master' into SPARK-733
Ilya Ganelin
committed

Commits on Jan 13, 2015

Merge remote-tracking branch 'upstream/master' into SPARK-733
Ilya Ganelin
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Revert "Completed refactoring to make vars in TaskMetrics class private"
Ilya Ganelin
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Revert "Partially updated task metrics to make some vars private"
Ilya Ganelin
committed

Commits on Jan 16, 2015

Updated to clarify verbage
Ilya Ganelin
committed