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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7609) startup used too much time to load edits
Date Thu, 15 Jan 2015 16:14:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14278877#comment-14278877
] 

Daryn Sharp commented on HDFS-7609:
-----------------------------------

I think there be a separate option to disable populating the cache on startup.  If someone
has a NN that can restart reasonably fast before clients give up, it crashes due to corrupt
edits, they restart in recovery, they probably would like clients to recover.

[~sureshms], thoughts?

> startup used too much time to load edits
> ----------------------------------------
>
>                 Key: HDFS-7609
>                 URL: https://issues.apache.org/jira/browse/HDFS-7609
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.2.0
>            Reporter: Carrey Zhan
>         Attachments: recovery_do_not_use_retrycache.patch
>
>
> One day my namenode crashed because of two journal node timed out at the same time under
very high load, leaving behind about 100 million transactions in edits log.(I still have no
idea why they were not rolled into fsimage.)
> I tryed to restart namenode, but it showed that almost 20 hours would be needed before
finish, and it was loading fsedits most of the time. I also tryed to restart namenode in recover
mode, the loading speed had no different.
> I looked into the stack trace, judged that it is caused by the retry cache. So I set
dfs.namenode.enable.retrycache to false, the restart process finished in half an hour.
> I think the retry cached is useless during startup, at least during recover process.



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