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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-744) Support hsync in HDFS
Date Thu, 31 May 2012 01:42:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13286255#comment-13286255

Tsz Wo (Nicholas), SZE commented on HDFS-744:

For backporting it to 1.0, it requires a completely different patch.

For merging it to 2.0.x, the 2.0.0-alpha release is already out and we are not supposed to
add new features to a minor release.  We should first send out an email to the hdfs-dev list
to check with other people.  I beg no one would object it.  Lars, do you want to send the
email or I could do it?
> Support hsync in HDFS
> ---------------------
>                 Key: HDFS-744
>                 URL: https://issues.apache.org/jira/browse/HDFS-744
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node, hdfs client
>            Reporter: Hairong Kuang
>            Assignee: Lars Hofhansl
>             Fix For: 3.0.0
>         Attachments: HDFS-744-trunk-v2.patch, HDFS-744-trunk-v3.patch, HDFS-744-trunk-v4.patch,
HDFS-744-trunk-v5.patch, HDFS-744-trunk-v6.patch, HDFS-744-trunk-v7.patch, HDFS-744-trunk-v8.patch,
HDFS-744-trunk.patch, hdfs-744-v2.txt, hdfs-744-v3.txt, hdfs-744.txt
> HDFS-731 implements hsync by default as hflush. As descriibed in HADOOP-6313, the real
expected semantics should be "flushes out to all replicas and all replicas have done posix
fsync equivalent - ie the OS has flushed it to the disk device (but the disk may have it in
its cache)." This jira aims to implement the expected behaviour.

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