jin xing created SPARK-24143:
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Summary: filter empty blocks when convert mapstatus to (blockId,
size) pair
Key: SPARK-24143
URL: https://issues.apache.org/jira/browse/SPARK-24143
Project: Spark
Issue Type: New Feature
Components: Spark Core
Affects Versions: 2.3.0
Reporter: jin xing
In current code(MapOutputTracker.convertMapStatuses), mapstatus are converted
to (blockId, size) pair for all blocks -- no matter the block is empty or not,
which result in OOM when there are lots of consecutive empty blocks, especially
when adaptive execution is enabled.
(blockId, size) pair is only used in ShuffleBlockFetcherIterator to control
shuffle-read and only non-empty block request is sent. Can we just filter out
the empty blocks in MapOutputTracker.convertMapStatuses and save memory?
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