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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6934) Move checksum computation off the hot path when writing to RAM disk
Date Sun, 26 Oct 2014 23:12:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14184695#comment-14184695
] 

Xiaoyu Yao commented on HDFS-6934:
----------------------------------

The 5th patch looks pretty good to me. Thanks [~cnauroth] for addressing all the questions.
+1 (non-binding).

> Move checksum computation off the hot path when writing to RAM disk
> -------------------------------------------------------------------
>
>                 Key: HDFS-6934
>                 URL: https://issues.apache.org/jira/browse/HDFS-6934
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>            Reporter: Arpit Agarwal
>            Assignee: Chris Nauroth
>         Attachments: HDFS-6934.3.patch, HDFS-6934.4.patch, HDFS-6934.5.patch, h6934_20141003b.patch,
h6934_20141005.patch
>
>
> Since local RAM is considered reliable we can avoid writing checksums on the hot path
when replicas are being written to a local RAM disk.
> The checksum can be computed by the lazy writer when moving replicas to disk.



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