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https://issues.apache.org/jira/browse/HADOOP-3515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605717#action_12605717
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Tsz Wo (Nicholas), SZE commented on HADOOP-3515:
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Hi Dhruba, you are right that (3) does not support concurrent appenders.

> Protocol changes to allow appending to the last partial  crc chunk of a file
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-3515
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3515
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> To support "appending" to an existing file, we need the ability to append 
> data to the last partial crc chunk of the file. 

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