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https://issues.apache.org/jira/browse/HDFS-5135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14105866#comment-14105866
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Brandon Li commented on HDFS-5135:
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The first 4 bytes of the RPC package you got might be the fragment 
header(RECORD MARKING). On the server side, we use RpcFrameDecoder to process 
the fragment header (referring bootstrap.setPipelineFactory() in 
SimpleTcpServer). Let me know if this is not the case.

> Umbrella JIRA for NFS end to end unit test frameworks
> -----------------------------------------------------
>
>                 Key: HDFS-5135
>                 URL: https://issues.apache.org/jira/browse/HDFS-5135
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: nfs
>    Affects Versions: 2.2.0
>            Reporter: Brandon Li
>            Assignee: Zhe Zhang
>
> Currently, we have to manually start portmap and nfs3 processes to test patch 
> and new functionalities. This JIRA is to track the effort to introduce a test 
> framework to NFS unit test without starting standalone nfs3 processes.



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