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From "Wenchen Fan (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-24143) filter empty blocks when convert mapstatus to (blockId, size) pair
Date Mon, 07 May 2018 06:20:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-24143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wenchen Fan reassigned SPARK-24143:
-----------------------------------

    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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