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