[SPARK-3694] RDD and Task serialization debugging output#3518

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ilganeli wants to merge 25 commits intoapache:masterfrom

ilganeli:SPARK-3694B

Commits on Oct 30, 2014

Created class to traverse dependency graph of RDD
Ilya Ganelin
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Started walker code
Ilya Ganelin
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Commits on Nov 6, 2014

RDD WAlker updates
Ilya Ganelin
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Added debug output to task serialization. Added debug output to RDD serialization.
Ilya Ganelin
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Rebase
Ilya Ganelin
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Commits on Nov 14, 2014

Style errors
Ilya Ganelin
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Commits on Nov 29, 2014

Merge remote-tracking branch 'upstream/master'
Ilya Ganelin
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Manual merge of updates
Ilya Ganelin
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Added helper files
Ilya Ganelin
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Commits on Nov 30, 2014

Fixed whitespace errors
Ilya Ganelin
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Updated documentation to add debug parameter for rdd serialization
Ilya Ganelin
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Commits on Dec 1, 2014

Incorporated feedback from PR. Cleaned up code and refactored interface to RDD traversal so that we now return a structured object instead of a formatted string
Ilya Ganelin
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Fixed incorrect boolean in test script
Ilya Ganelin
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Minor comment fixes
Ilya Ganelin
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Commits on Dec 16, 2014

Commits on Dec 17, 2014

Code needs work, need to properly store references
Ilya Ganelin
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Commits on Dec 18, 2014

Commits on Jan 12, 2015

Fixed merge issues from SPARK-4737
Ilya Ganelin
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Commits on Jan 16, 2015

Updated to use scala queues insteadof google queues
Ilya Ganelin
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Fixed style issue
Ilya Ganelin
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