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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6331) ClientProtocol#setXattr should not be annotated idempotent
Date Sat, 03 May 2014 04:28:15 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6331?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Uma Maheswara Rao G updated HDFS-6331:

    Attachment: HDFS-6331.patch

Thanks for spotting this issue.
Yes you are right. With default flags of setXattrs, we will not have an issue because we just
do REPLACE if exist and CREATE if not there.
But the issue with CREATE flag. Once before returning the RPC response back if the network
broken, the client retry may attempt CREATE again and it will throw the exception to user
as Xattr already created with previous call.
While I verified it  have changes on this issue. Just uploading a patch with a test what TestRetryCacheWithHA
covering for retryCache.

> ClientProtocol#setXattr should not be annotated idempotent
> ----------------------------------------------------------
>                 Key: HDFS-6331
>                 URL: https://issues.apache.org/jira/browse/HDFS-6331
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: HDFS XAttrs (HDFS-2006)
>            Reporter: Andrew Wang
>         Attachments: HDFS-6331.patch
> ClientProtocol#setXAttr is annotated @Idempotent, but this is incorrect since subsequent
retries need to throw different exceptions based on the passed flags (e.g. CREATE, REPLACE).

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