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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2694) Removal of Avro broke non-PB NN services
Date Fri, 16 Dec 2011 19:04:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171139#comment-13171139

Aaron T. Myers commented on HDFS-2694:

TestGetGroups isn't failing because the client side (run in the same JVM) ends up correctly
initializing WritableRpcEngine, which causes it to be registered on the server side as well.
> Removal of Avro broke non-PB NN services
> ----------------------------------------
>                 Key: HDFS-2694
>                 URL: https://issues.apache.org/jira/browse/HDFS-2694
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.24.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
> RpcEngine implementations have to register themselves associated with an RpcKind. Both
WritableRpcEngine and ProtobufRpcEngine do this registration in static initialization blocks.
It used to be that the static initializer block for WritableRpcEngine was triggered when AvroRpcEngine
was initialized, since this instantiated a WritableRpcEngine object. With AvroRpcEngine gone,
there's nothing in the NN to trigger the WritableRpcEngine static initialization block. Therefore,
those RPC services which still use Writable and not PB no longer work.
> For example, if I try to run `hdfs groups' on trunk, which uses the GetUserMappingsProtocol,
this error gets spit out:
> {noformat}
> $ hdfs groups
> log4j:ERROR Could not find value for key log4j.appender.NullAppender
> log4j:ERROR Could not instantiate appender named "NullAppender".
> Exception in thread "main" java.io.IOException: Unknown rpc kind RPC_WRITABLE
> 	at org.apache.hadoop.ipc.Client.call(Client.java:1136)
> 	at org.apache.hadoop.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:205)
> 	at $Proxy6.getGroupsForUser(Unknown Source)
> 	at org.apache.hadoop.tools.GetGroupsBase.run(GetGroupsBase.java:71)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:69)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:83)
> 	at org.apache.hadoop.hdfs.tools.GetGroups.main(GetGroups.java:56)
> {noformat}

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