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Posted to issues@spark.apache.org by "Josh Rosen (JIRA)" <ji...@apache.org> on 2016/09/10 06:48:20 UTC

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

Josh Rosen created SPARK-17491:
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             Summary: 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


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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