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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7976) Update NFS user guide for mount option "sync" to minimize or avoid reordered writes
Date Wed, 25 Mar 2015 14:39:56 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14379965#comment-14379965
] 

Hudson commented on HDFS-7976:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk-Java8 #134 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/134/])
HDFS-7976. Update NFS user guide for mount option 'sync' to minimize or avoid reordered writes.
Contributed by Brandon Li (brandonli: rev 51f1f4937402c63392854443ccde18c1579e3348)
* hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsNfsGateway.md
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt


> Update NFS user guide for mount option "sync" to minimize or avoid reordered writes
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-7976
>                 URL: https://issues.apache.org/jira/browse/HDFS-7976
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation, nfs
>    Affects Versions: 2.2.0
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>             Fix For: 2.7.0
>
>         Attachments: HDFS-7976.001.patch, HDFS-7976.002.patch
>
>
> The mount option "sync" is critical. I observed that this mount option can minimize or
avoid reordered writes. Mount option "sync" could have some negative performance impact on
the file uploading. However, it makes the performance much more predicable and can also reduce
the possibility of failures caused by file dumping.



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