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Posted to hdfs-issues@hadoop.apache.org by "Xiaoyu Yao (JIRA)" <ji...@apache.org> on 2014/09/30 22:43:34 UTC

[jira] [Assigned] (HDFS-7090) Use unbuffered writes when persisting in-memory replicas

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

Xiaoyu Yao reassigned HDFS-7090:
--------------------------------

    Assignee: Xiaoyu Yao

> 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: HDFS-6581
>            Reporter: Arpit Agarwal
>            Assignee: Xiaoyu Yao
>
> 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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