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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-6581) Write to single replica in memory
Date Thu, 21 Aug 2014 17:31:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14105639#comment-14105639
] 

Arpit Agarwal edited comment on HDFS-6581 at 8/21/14 5:30 PM:
--------------------------------------------------------------

A patch to demonstrate the approach we've been trying out.

This is a somewhat refined prototype but there are many rough edges we'll work on in the feature
branch, specifically around the lazy writer, eviction and recovery on restart.


was (Author: arpitagarwal):
A patch to demonstrate the approach we've been trying out.

This is a somewhat refined prototype but there are many rough edges we'll work on in the private
branch, specifically around the lazy writer, eviction and recovery on restart.

> Write to single replica in memory
> ---------------------------------
>
>                 Key: HDFS-6581
>                 URL: https://issues.apache.org/jira/browse/HDFS-6581
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: HDFS-6581-prototype.01.patch, HDFSWriteableReplicasInMemory.pdf
>
>
> Per discussion with the community on HDFS-5851, we will implement writing to a single
replica in DN memory via DataTransferProtocol.
> This avoids some of the issues with short-circuit writes, which we can revisit at a later
time.



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