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https://issues.apache.org/jira/browse/SPARK-18546?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-18546:
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Assignee: Marcelo Vanzin (was: Apache Spark)
> UnsafeShuffleWriter corrupts encrypted shuffle files when merging
> -----------------------------------------------------------------
>
> Key: SPARK-18546
> URL: https://issues.apache.org/jira/browse/SPARK-18546
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.0
> Reporter: Marcelo Vanzin
> Assignee: Marcelo Vanzin
> Priority: Critical
>
> The merging algorithm in {{UnsafeShuffleWriter}} does not consider
> encryption, and when it tries to merge encrypted files the result data cannot
> be read, since data encrypted with different initial vectors is interleaved
> in the same partition data. This leads to exceptions when trying to read the
> files during shuffle:
> {noformat}
> com.esotericsoftware.kryo.KryoException: com.ning.compress.lzf.LZFException:
> Corrupt input data, block did not start with 2 byte signature ('ZV') followed
> by type byte, 2-byte length)
> at com.esotericsoftware.kryo.io.Input.fill(Input.java:142)
> at com.esotericsoftware.kryo.io.Input.require(Input.java:155)
> at com.esotericsoftware.kryo.io.Input.readInt(Input.java:337)
> at
> com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:109)
> at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:610)
> at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:721)
> at
> org.apache.spark.serializer.KryoDeserializationStream.readObject(KryoSerializer.scala:228)
> at
> org.apache.spark.serializer.DeserializationStream.readKey(Serializer.scala:169)
> at
> org.apache.spark.util.collection.ExternalAppendOnlyMap$DiskMapIterator.readNextItem(ExternalAppendOnlyMap.scala:512)
> at
> org.apache.spark.util.collection.ExternalAppendOnlyMap$DiskMapIterator.hasNext(ExternalAppendOnlyMap.scala:533)
> ...
> {noformat}
> (This is our internal branch so don't worry if lines don't necessarily match.)
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