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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6773) MiniDFSCluster can run dramatically faster
Date Tue, 29 Jul 2014 22:01:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14078460#comment-14078460
] 

Daryn Sharp commented on HDFS-6773:
-----------------------------------

The reason is every NN operation currently takes the full hit for a spindle sync which can
cost 10+ms.

> MiniDFSCluster can run dramatically faster
> ------------------------------------------
>
>                 Key: HDFS-6773
>                 URL: https://issues.apache.org/jira/browse/HDFS-6773
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>
> The mini cluster is unnecessarily running with durable edit logs.  The following change
cut runtime of a single test from ~30s to ~10s.
> {code}EditLogFileOutputStream.setShouldSkipFsyncForTesting(true);{code}
> The mini cluster should default to this behavior after identifying the few edit log tests
that probably depend on durable logs.



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