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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6581) Write to single replica in memory
Date Fri, 22 Aug 2014 00:04:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14106203#comment-14106203
] 

Gopal V commented on HDFS-6581:
-------------------------------

Swap in modern kernels are checksummed with crc32c.

Re: RAMfs, the [tmpfs] mediatype applies to anything which shows up as a directory. Perhaps
a rename would make it clearer.

This approach allows someone who wants to mount some other kind of volatile storage (or even
a real "ramdisk").

> Write to single replica in memory
> ---------------------------------
>
>                 Key: HDFS-6581
>                 URL: https://issues.apache.org/jira/browse/HDFS-6581
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: 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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