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https://issues.apache.org/jira/browse/SPARK-10374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14723768#comment-14723768
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Matt Cheah commented on SPARK-10374:
------------------------------------
I intend to create a smaller standalone program that reproduces the issue and
where I can paste the full dependency graph. The application where I saw the
issue at first is pretty big and viewing the whole graph would be pretty much
intractible.
> Spark-core 1.5.0-RC2 can create version conflicts with apps depending on
> protobuf-2.4
> -------------------------------------------------------------------------------------
>
> Key: SPARK-10374
> URL: https://issues.apache.org/jira/browse/SPARK-10374
> Project: Spark
> Issue Type: Bug
> Affects Versions: 1.5.0
> Reporter: Matt Cheah
> Priority: Blocker
> Fix For: 1.5.0
>
>
> My Hadoop cluster is running 2.0.0-CDH4.7.0, and I have an application that
> depends on the Spark 1.5.0 libraries via Gradle, and Hadoop 2.0.0 libraries.
> When I run the driver application, I can hit the following error:
> {code}
> <redacted other messages>… java.lang.UnsupportedOperationException: This is
> supposed to be overridden by subclasses.
> at
> com.google.protobuf.GeneratedMessage.getUnknownFields(GeneratedMessage.java:180)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$GetFileInfoRequestProto.getSerializedSize(ClientNamenodeProtocolProtos.java:30108)
> at
> com.google.protobuf.AbstractMessageLite.toByteString(AbstractMessageLite.java:49)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.constructRpcRequest(ProtobufRpcEngine.java:149)
> {code}
> This application used to work when pulling in Spark 1.4.1 dependencies, and
> thus this is a regression.
> I used Gradle’s dependencyInsight task to dig a bit deeper. Against our Spark
> 1.4.1-backed project, it shows that dependency resolution pulls in Protobuf
> 2.4.0a from the Hadoop CDH4 modules and Protobuf 2.5.0-spark from the Spark
> modules. It appears that Spark used to shade its protobuf dependencies and
> hence Spark’s and Hadoop’s protobuf dependencies wouldn’t collide. However
> when I ran dependencyInsight again against Spark 1.5 and it looks like
> protobuf is no longer shaded from the Spark module.
> 1.4.1 dependencyInsight:
> {code}
> com.google.protobuf:protobuf-java:2.4.0a
> +--- org.apache.hadoop:hadoop-common:2.0.0-cdh4.6.0
> | \--- org.apache.hadoop:hadoop-client:2.0.0-mr1-cdh4.6.0
> | +--- compile
> | \--- org.apache.spark:spark-core_2.10:1.4.1
> | +--- compile
> | +--- org.apache.spark:spark-sql_2.10:1.4.1
> | | \--- compile
> | \--- org.apache.spark:spark-catalyst_2.10:1.4.1
> | \--- org.apache.spark:spark-sql_2.10:1.4.1 (*)
> \--- org.apache.hadoop:hadoop-hdfs:2.0.0-cdh4.6.0
> \--- org.apache.hadoop:hadoop-client:2.0.0-mr1-cdh4.6.0 (*)
> org.spark-project.protobuf:protobuf-java:2.5.0-spark
> \--- org.spark-project.akka:akka-remote_2.10:2.3.4-spark
> \--- org.apache.spark:spark-core_2.10:1.4.1
> +--- compile
> +--- org.apache.spark:spark-sql_2.10:1.4.1
> | \--- compile
> \--- org.apache.spark:spark-catalyst_2.10:1.4.1
> \--- org.apache.spark:spark-sql_2.10:1.4.1 (*)
> {code}
> 1.5.0-rc2 dependencyInsight:
> {code}
> com.google.protobuf:protobuf-java:2.5.0 (conflict resolution)
> \--- com.typesafe.akka:akka-remote_2.10:2.3.11
> \--- org.apache.spark:spark-core_2.10:1.5.0-rc2
> +--- compile
> +--- org.apache.spark:spark-sql_2.10:1.5.0-rc2
> | \--- compile
> \--- org.apache.spark:spark-catalyst_2.10:1.5.0-rc2
> \--- org.apache.spark:spark-sql_2.10:1.5.0-rc2 (*)
> com.google.protobuf:protobuf-java:2.4.0a -> 2.5.0
> +--- org.apache.hadoop:hadoop-common:2.0.0-cdh4.6.0
> | \--- org.apache.hadoop:hadoop-client:2.0.0-mr1-cdh4.6.0
> | +--- compile
> | \--- org.apache.spark:spark-core_2.10:1.5.0-rc2
> | +--- compile
> | +--- org.apache.spark:spark-sql_2.10:1.5.0-rc2
> | | \--- compile
> | \--- org.apache.spark:spark-catalyst_2.10:1.5.0-rc2
> | \--- org.apache.spark:spark-sql_2.10:1.5.0-rc2 (*)
> \--- org.apache.hadoop:hadoop-hdfs:2.0.0-cdh4.6.0
> \--- org.apache.hadoop:hadoop-client:2.0.0-mr1-cdh4.6.0 (*)
> {code}
> Clearly we can't force the version to be one way or the other. If I force
> protobuf to use 2.5.0, then invoking Hadoop code from my application will
> break as Hadoop 2.0.0 jars are compiled against protobuf-2.4. On the other
> hand, forcing protobuf to use version 2.4 breaks spark-core code that is
> compiled against protobuf-2.5. Note that protobuf-2.4 and protobuf-2.5 are
> not binary compatible.
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