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https://issues.apache.org/jira/browse/HDFS-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoyu Yao updated HDFS-7090:
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Attachment: HDFS-7090.3.patch
Thanks Chris for the quick response! I've update the patch based on the
feedback.
> 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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