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Date: Fri, 13 Jul 2012 21:50:34 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3656) ZKFC may write a null "breadcrumb"
 znode
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    [ https://issues.apache.org/jira/browse/HDFS-3656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414087#comment-13414087 ] 

Todd Lipcon commented on HDFS-3656:
-----------------------------------

I'm working on getting more logs that might indicate how the null got there.
                
> ZKFC may write a null "breadcrumb" znode
> ----------------------------------------
>
>                 Key: HDFS-3656
>                 URL: https://issues.apache.org/jira/browse/HDFS-3656
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: auto-failover
>    Affects Versions: 2.0.0-alpha
>            Reporter: Todd Lipcon
>
> A user [reported|https://issues.cloudera.org/browse/DISTRO-412] an NPE trying to read the "breadcrumb" znode in the failover controller. This happened repeatedly, implying that an earlier process set the znode to null - probably some race, though I don't see anything obvious in the code.

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