[jira] [Created] (SPARK-18546) UnsafeShuffleWriter corrupts encrypted shuffle files when merging

["Marcelo Vanzin (JIRA)" <ji...@apache.org>]

Marcelo Vanzin created SPARK-18546:
--------------------------------------

             Summary: 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.)




--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org