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https://issues.apache.org/jira/browse/SPARK-24143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-24143:
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Assignee: jin xing
> 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: Bug
> Components: Spark Core
> Affects Versions: 2.3.0
> Reporter: jin xing
> Assignee: jin xing
> Priority: Major
> Fix For: 2.4.0
>
>
> 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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