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From "Brandon Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7564) NFS gateway dynamically reload UID/GID mapping file /etc/nfs.map
Date Fri, 02 Jan 2015 19:34:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14263164#comment-14263164
] 

Brandon Li commented on HDFS-7564:
----------------------------------

Thanks [~yzhangal]. The patch looks good in general. 
It needs to be rebased after HDFS-7573 was committed. 
{quote}The patch reload the nfs.map file if the last modification time of this file is newer
than last upload.{quote}
This can be a problem especially when the system time is modified.
{quote}
    // Use Time.now() to be consistent with File#lastModified()
    lastUpdateTimeStaticMap = Time.now();
{quote}
Why not get the file modification time directly? Next time we can just compare if it has been
changed, and reload the file if the new timestamp is different(newer or older). 


> NFS gateway dynamically reload UID/GID mapping file /etc/nfs.map
> ----------------------------------------------------------------
>
>                 Key: HDFS-7564
>                 URL: https://issues.apache.org/jira/browse/HDFS-7564
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: nfs
>    Affects Versions: 2.6.0
>         Environment: HDP 2.2
>            Reporter: Hari Sekhon
>            Assignee: Yongjun Zhang
>            Priority: Minor
>         Attachments: HDFS-7564.001.patch
>
>
> Add dynamic reload of the NFS gateway UID/GID mappings file /etc/nfs.map (default for
static.id.mapping.file).
> It seems that the mappings file is currently only read upon restart of the NFS gateway
which would cause any active clients NFS mount points to hang or fail.
> Regards,
> Hari Sekhon
> http://www.linkedin.com/in/harisekhon



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