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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2018/05/02 05:50:00 UTC
[jira] [Assigned] (SPARK-24143) filter empty blocks when convert
mapstatus to (blockId, size) pair
[ https://issues.apache.org/jira/browse/SPARK-24143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-24143:
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Assignee: Apache Spark
> 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: Apache Spark
> Priority: Major
>
> 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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