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https://issues.apache.org/jira/browse/SPARK-7335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14966490#comment-14966490
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Romi Kuntsman commented on SPARK-7335:
--------------------------------------
[~meiyoula] can you please reopen the issue?
I got this error as well, and wasted a lot of time realizing it was actually a
ClassNotFoundException due to a missing jar - it doesn't say that anywhere in
the exception.
When the class to be serialized/deserialized is not found, then the exception
should explicitly say so. When the message says "unread block data" it's very
confusing.
Here's a reference from another project who got the same error and many people
spent time to realize it was a missing jar:
https://github.com/tuplejump/calliope-release/issues/6
> Submitting a query to Thrift Server occurs error:
> java.lang.IllegalStateException: unread block data
> ----------------------------------------------------------------------------------------------------
>
> Key: SPARK-7335
> URL: https://issues.apache.org/jira/browse/SPARK-7335
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: meiyoula
> Priority: Critical
>
> java.lang.IllegalStateException: unread block data
> at
> java.io.ObjectInputStream$BlockDataInputStream.setBlockDataMode(ObjectInputStream.java:2421)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1382)
> at
> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990)
> at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
> at
> org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:62)
> at
> org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:87)
> at
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:163)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
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