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Date: Wed, 3 Sep 2014 17:58:52 +0000 (UTC)
From: "Arpit Agarwal (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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 <JIRA.12738717.1409723807592@arcas>
Subject: [jira] [Resolved] (HDFS-6991) Notify NN of evicted block before
 deleting it from RAM disk
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     [ https://issues.apache.org/jira/browse/HDFS-6991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arpit Agarwal resolved HDFS-6991.
---------------------------------
    Resolution: Duplicate

I'll include the fix in HDFS-6930 since the same code is modified by both patches.

> 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
>
>
> 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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