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From "Zhihong Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6340) HBase RPC does not allow protocol extension with common interfaces.
Date Wed, 15 Aug 2012 04:37:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434804#comment-13434804
] 

Zhihong Ted Yu commented on HBASE-6340:
---------------------------------------

When I put this patch on top of latest patch from HBASE-6414, I got:
{code}
testCalls(org.apache.hadoop.hbase.ipc.TestProtocolExtension)  Time elapsed: 0.767 sec  <<<
ERROR!
java.lang.NullPointerException
  at org.apache.hadoop.hbase.ipc.ProtobufRpcEngine$Invoker.constructRpcRequest(ProtobufRpcEngine.java:130)
  at org.apache.hadoop.hbase.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:175)
  at $Proxy5.ping(Unknown Source)
  at org.apache.hadoop.hbase.ipc.TestProtocolExtension.testCalls(TestProtocolExtension.java:91)
{code}
which is this line in constructRpcRequest():
{code}
      int length = params.length;
{code}

You can rebase patch on 0.94 so that Lars can take a look.

For trunk, investigation is needed after HBASE-6414 goes in.
                
> HBase RPC does not allow protocol extension with common interfaces.
> -------------------------------------------------------------------
>
>                 Key: HBASE-6340
>                 URL: https://issues.apache.org/jira/browse/HBASE-6340
>             Project: HBase
>          Issue Type: Bug
>          Components: coprocessors, regionserver
>    Affects Versions: 0.92.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>         Attachments: RPCInvocation.patch
>
>
> HBase RPC fails if MyProtocol extends an interface, which is not a VersionedProtocol
even if MyProtocol also directly extends VersionedProtocol. The reason is that rpc Invocation
uses Method.getDeclaringClass(), which returns the interface class rather than the class of
MyProtocol.

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