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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4233) NN keeps serving even after no journals started while rolling edit
Date Wed, 28 Nov 2012 22:06:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13505956#comment-13505956
] 

Harsh J commented on HDFS-4233:
-------------------------------

bq. FD exhaustion is an interesting bug.

I am unsure of what fd exhaustion means (is it hitting nofile limits?), but since we already
monitor disk space and inode resources at the NN (and get into safemode), we could throw in
monitoring for this as well?
                
> NN keeps serving even after no journals started while rolling edit
> ------------------------------------------------------------------
>
>                 Key: HDFS-4233
>                 URL: https://issues.apache.org/jira/browse/HDFS-4233
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.5
>            Reporter: Kihwal Lee
>            Priority: Critical
>
> We've seen namenode keeps serving even after rollEditLog() failure. Instead of taking
a corrective action or regard this condition as FATAL, it keeps on serving and modifying its
file system state. No logs are written from this point, so if the namenode is restarted, there
will be data loss.

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