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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6934) Move checksum computation off the hot path when writing to RAM disk
Date Mon, 27 Oct 2014 19:06:36 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Chris Nauroth updated HDFS-6934:
    Attachment: HDFS-6934-branch-2.6.5.patch

There was a very slight merge conflict on merging to branch-2.6.  It was just an indentation
difference caused by the fact that the tracing work (HDFS-7055) is in branch-2, but not branch-2.6.

I have attached a branch-2.6 patch.  [~szetszwo], are you +1 for this version too?  The only
difference compared to branch-2 is some indentation in {{BlockReaderLocal}}.

> 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, hdfs-client
>            Reporter: Arpit Agarwal
>            Assignee: Chris Nauroth
>         Attachments: HDFS-6934-branch-2.6.5.patch, 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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