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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-24160) ShuffleBlockFetcherIterator should fail if it receives zero-size blocks
Date Wed, 02 May 2018 22:14:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-24160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-24160:
------------------------------------

    Assignee: Josh Rosen  (was: Apache Spark)

> ShuffleBlockFetcherIterator should fail if it receives zero-size blocks
> -----------------------------------------------------------------------
>
>                 Key: SPARK-24160
>                 URL: https://issues.apache.org/jira/browse/SPARK-24160
>             Project: Spark
>          Issue Type: Improvement
>          Components: Shuffle
>    Affects Versions: 2.3.0
>            Reporter: Josh Rosen
>            Assignee: Josh Rosen
>            Priority: Major
>
> In the shuffle layer, we guarantee that zero-size blocks will never be requested (a block
containing zero records is always 0 bytes in size and is marked as empty such that it will
never be legitimately requested by executors). However, we failed to take advantage of this
in the shuffle-read path: the existing code did not explicitly check whether blocks are non-zero-size.
>  
> We should add `buf.size != 0` checks to ShuffleBlockFetcherIterator to take advantage
of this invariant and prevent potential data loss / corruption issues. 



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