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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6581) Write to single replica in memory
Date Thu, 16 Oct 2014 22:56:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14174407#comment-14174407
] 

Jitendra Nath Pandey commented on HDFS-6581:
--------------------------------------------

I am planning to merge this to branch-2 today, and subsequently to branch-2.6 by tomorrow.
As agreed on HDFS-6919, In 2.6 we will indicate in the release notes that the memory for writes
on RAM and the memory for caching in datanodes are independent, and a feature to manage them
together will be added in the next release.

> Write to single replica in memory
> ---------------------------------
>
>                 Key: HDFS-6581
>                 URL: https://issues.apache.org/jira/browse/HDFS-6581
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode, hdfs-client, namenode
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>             Fix For: 3.0.0
>
>         Attachments: HDFS-6581.merge.01.patch, HDFS-6581.merge.02.patch, HDFS-6581.merge.03.patch,
HDFS-6581.merge.04.patch, HDFS-6581.merge.05.patch, HDFS-6581.merge.06.patch, HDFS-6581.merge.07.patch,
HDFS-6581.merge.08.patch, HDFS-6581.merge.09.patch, HDFS-6581.merge.10.patch, HDFS-6581.merge.11.patch,
HDFS-6581.merge.12.patch, HDFS-6581.merge.14.patch, HDFS-6581.merge.15.patch, HDFSWriteableReplicasInMemory.pdf,
Test-Plan-for-HDFS-6581-Memory-Storage.pdf, Test-Plan-for-HDFS-6581-Memory-Storage.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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