[jira] [Comment Edited] (HDFS-6926) DN support for saving replicas to persistent storage and evicting in-memory replicas

["Arpit Agarwal (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-6926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14108148#comment-14108148 ] 

Arpit Agarwal edited comment on HDFS-6926 at 8/23/14 9:14 PM:
--------------------------------------------------------------

The attached implementations of checkpointing and eviction are rough prototypes to get tests to pass. We will refine them in the feature branch before merging to trunk.


was (Author: arpitagarwal):
The attached implementation of eviction is prototype and very crude, for testing. We will refine it in the feature branch before merging to trunk.

> DN support for saving replicas to persistent storage and evicting in-memory replicas
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-6926
>                 URL: https://issues.apache.org/jira/browse/HDFS-6926
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: HDFS-6581
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: HDFS-6926.01.patch
>
>
> Add the following:
> # A lazy writer on the DN to move replicas from RAM disk to persistent storage.
> # 'Evict' persisted replicas from RAM disk to make space for new blocks.



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