Do not re-use objects in the EdgePartition/EdgeTriplet iterators.#276

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darabos wants to merge 7 commits intoapache:masterfrom

darabos:spark-1188

Commits on Mar 31, 2014

Tests that reproduce the problems from SPARK-1188.
darabos
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Do not re-use objects in the EdgePartition/EdgeTriplet iterators. This avoids a silent data corruption issue (SPARK-1188) and has no performance impact in my measurements. It also simplifies the code.
darabos
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Commits on Apr 2, 2014

Restore "manual" copying in EdgePartition.map(Iterator). Add comment to discourage novices like myself from trying to simplify the code.
darabos
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