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https://issues.apache.org/jira/browse/HDFS-7926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14360625#comment-14360625
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Jitendra Nath Pandey commented on HDFS-7926:
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+1
> NameNode implementation of ClientProtocol.truncate(..) is not idempotent
> ------------------------------------------------------------------------
>
> Key: HDFS-7926
> URL: https://issues.apache.org/jira/browse/HDFS-7926
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Attachments: h7926_20150313.patch, h7926_20150313b.patch
>
>
> If dfsclient drops the first response of a truncate RPC call, the retry by
> retry cache will fail with "DFSClient ... is already the current lease
> holder". The truncate RPC is annotated as @Idempotent in ClientProtocol but
> the NameNode implementation is not.
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