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From "Brandon Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7976) Update NFS user guide for mount option "sync" to minimize or avoid reordered writes
Date Mon, 23 Mar 2015 23:19:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376889#comment-14376889
] 

Brandon Li commented on HDFS-7976:
----------------------------------

Thank you, Arpit. I've updated the patch to indicate the importance of this option for the
large file uploading.

> 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
>         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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