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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2702) A single failed name dir can cause the NN to exit
Date Sat, 17 Dec 2011 21:13:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171678#comment-13171678

Eli Collins commented on HDFS-2702:

This bug exists in FSEditLog#close as well.
> A single failed name dir can cause the NN to exit 
> --------------------------------------------------
>                 Key: HDFS-2702
>                 URL: https://issues.apache.org/jira/browse/HDFS-2702
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>            Priority: Critical
> There's a bug in FSEditLog#rollEditLog which results in the NN process exiting if a single
name dir has failed. Here's the relevant code:
> {code}
> close()  // So editStreams.size() is 0 
> foreach edits dir {
>   ..
>   eStream = new ...  // Might get an IOE here
>   editStreams.add(eStream);
> } catch (IOException ioe) {
>   removeEditsForStorageDir(sd);  // exits if editStreams.size() <= 1  
> }
> {code}
> If we get an IOException before we've added two edits streams to the list we'll exit,
eg if there's an error processing the 1st name dir we'll exit even if there are 4 valid name
dirs. The fix is to move the checking out of removeEditsForStorageDir (nee processIOError)
or modify it so it can be disabled in some cases, eg here where we don't yet know how many
streams are valid.

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