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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6991) Notify NN of evicted block before deleting it from RAM disk
Date Thu, 04 Sep 2014 20:29:25 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arpit Agarwal updated HDFS-6991:
--------------------------------
    Attachment: HDFS-6991.03.patch

Thanks Xiaoyu, good finds. Updated patch with your feedback.

> Notify NN of evicted block before deleting it from RAM disk
> -----------------------------------------------------------
>
>                 Key: HDFS-6991
>                 URL: https://issues.apache.org/jira/browse/HDFS-6991
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>    Affects Versions: HDFS-6581
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: HDFS-6991.01.patch, HDFS-6991.02.patch, HDFS-6991.03.patch
>
>
> When evicting a block from RAM disk to persistent storage, the DN should notify the NN
of the persistent replica before deleting the replica from RAM disk. Else there can be a window
of time during which the block is considered 'missing' by the NN.
> Found by [~xyao] via HDFS-6950.



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