[SPARK-2774] Set preferred locations for reduce tasks #4576
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This is another attempt at apache#1697 addressing some of the earlier concerns. This adds a couple of thresholds based on number map and reduce tasks beyond which we don't use preferred locations for reduce tasks. This patch also fixes some bugs in DAGSchedulerSuite where the MapStatus objects created didn't have the right number of reducers set.
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Test build #27386 has started for PR 4576 at commit
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Test build #27386 has finished for PR 4576 at commit
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Test FAILed. |
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Test build #27398 has started for PR 4576 at commit
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Test build #27398 has finished for PR 4576 at commit
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Test PASSed. |
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Ping |
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I am cleaning up old PR's and would propose to close this issue pending further discussion. |
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This is another attempt at #1697 addressing some of the earlier concerns.
This adds a couple of thresholds based on number map and reduce tasks beyond which we don't use preferred locations for reduce tasks.
This patch also fixes some bugs in DAGSchedulerSuite where the MapStatus objects created didn't have the right number of reducers set.
cc @JoshRosen @rxin @pwendell