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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-24143) filter empty blocks when convert mapstatus to (blockId, size) pair
Date Wed, 02 May 2018 05:50:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-24143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16460548#comment-16460548
] 

Apache Spark commented on SPARK-24143:
--------------------------------------

User 'jinxing64' has created a pull request for this issue:
https://github.com/apache/spark/pull/21212

> 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
>            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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