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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-6991) Notify NN of evicted block before deleting it from RAM disk
Date Wed, 03 Sep 2014 20:58:51 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14119458#comment-14119458

Arpit Agarwal edited comment on HDFS-6991 at 9/3/14 8:58 PM:

The patch requires HDFS-6977 patch to be applied first.

was (Author: arpitagarwal):
The patch requires the patches for HDFS-6930, HDFS-6977 and HDFS-6950 to be applied in that

> 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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