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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7090) Use unbuffered writes when persisting in-memory replicas
Date Mon, 13 Oct 2014 18:02:35 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Chris Nauroth updated HDFS-7090:
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

Xiaoyu pointed out that the test failures are unrelated.  {{TestOpenFilesWithSnapshot}} just
got fixed in HDFS-7236.  {{TestDNFencing}} is an existing failure tracked in HDFS-7226.

I committed this to trunk.  Xiaoyu, thank you for contributing the patch.

> Use unbuffered writes when persisting in-memory replicas
> --------------------------------------------------------
>                 Key: HDFS-7090
>                 URL: https://issues.apache.org/jira/browse/HDFS-7090
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 2.6.0
>            Reporter: Arpit Agarwal
>            Assignee: Xiaoyu Yao
>             Fix For: 3.0.0
>         Attachments: HDFS-7090.0.patch, HDFS-7090.1.patch, HDFS-7090.2.patch, HDFS-7090.3.patch,
> The LazyWriter thread just uses {{FileUtils.copyFile}} to copy block files to persistent
storage. It would be better to use unbuffered writes to avoid churning page cache.

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