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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3860) Compare name-node performance when journaling is performed into local hard-drives or nfs.
Date Thu, 31 Jul 2008 19:02:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618809#action_12618809
] 

Raghu Angadi commented on HADOOP-3860:
--------------------------------------

It looks as though it is not just the number of mutations but something else matters as well(may
be amount of data written to edits log per mutation, cpu, or locking). That could explain
large disparity between number creates, renames, and deletes though each of these is  single
mutation.

> Compare name-node performance when journaling is performed into local hard-drives or
nfs.
> -----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3860
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3860
>             Project: Hadoop Core
>          Issue Type: Improvement
>    Affects Versions: 0.19.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.19.0
>
>         Attachments: NNThruputMoreOps.patch
>
>
> The goal of this issue is to measure how the name-node performance depends on where the
edits log is written to.
> Three types of the journal storage should be evaluated:
> # local hard drive;
> # remote drive mounted via nfs;
> # nfs filer.

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