[jira] [Resolved] (SPARK-17491) MemoryStore.putIteratorAsBytes() may silently lose values when KryoSerializer is used

["Josh Rosen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-17491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Rosen resolved SPARK-17491.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 2.1.0
                   2.0.1

Issue resolved by pull request 15043
[https://github.com/apache/spark/pull/15043]

> MemoryStore.putIteratorAsBytes() may silently lose values when KryoSerializer is used
> -------------------------------------------------------------------------------------
>
>                 Key: SPARK-17491
>                 URL: https://issues.apache.org/jira/browse/SPARK-17491
>             Project: Spark
>          Issue Type: Bug
>          Components: Block Manager
>    Affects Versions: 2.0.0
>            Reporter: Josh Rosen
>            Assignee: Josh Rosen
>            Priority: Blocker
>              Labels: correctness
>             Fix For: 2.0.1, 2.1.0
>
>
> MemoryStore.putIteratorAsBytes() may silently lose values when used with KryoSerializer because it does not properly close the serialization stream before attempting to deserialize the already-serialized values, which may cause values buffered in Kryo's internal buffers to not be read.
> This is the root cause behind a user-reported "wrong answer" bug in PySpark caching reported by Ben Leslie on the Spark user mailing list in a thread titled "pyspark persist MEMORY_ONLY vs MEMORY_AND_DISK")



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