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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1071) savenamespace should write the fsimage to all configured fs.name.dir in parallel
Date Sat, 15 May 2010 01:49:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867778#action_12867778
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Todd Lipcon commented on HDFS-1071:
-----------------------------------

Few small notes:

- Please change the Threads to be named - eg "FSImageSaver for /path/to/dir"
- I'm not sure if the behavior under InterruptedException is right - don't we want to retry
joining on that thread? Or perhaps interrupt those threads themselves? I'm worried about leaving
a straggling thread saving the namespace during a ^C shutdown, for example.
- The code to join on all the threads in the list is repeated a lot - maybe factor into a
static method?


> savenamespace should write the fsimage to all configured fs.name.dir in parallel
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-1071
>                 URL: https://issues.apache.org/jira/browse/HDFS-1071
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: dhruba borthakur
>            Assignee: Dmytro Molkov
>         Attachments: HDFS-1071.patch
>
>
> If you have a large number of files in HDFS, the fsimage file is very big. When the namenode
restarts, it writes a copy of the fsimage to all directories configured in fs.name.dir. This
takes a long time, especially if there are many directories in fs.name.dir. Make the NN write
the fsimage to all these directories in parallel.

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