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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7121) For JournalNode operations that must succeed on all nodes, execute a pre-check to verify that the operation can succeed.
Date Mon, 13 Oct 2014 19:45:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14169832#comment-14169832
] 

Colin Patrick McCabe commented on HDFS-7121:
--------------------------------------------

Sounds good.  Thanks for working on this.

> For JournalNode operations that must succeed on all nodes, execute a pre-check to verify
that the operation can succeed.
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-7121
>                 URL: https://issues.apache.org/jira/browse/HDFS-7121
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: journal-node
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>
> Several JournalNode operations are not satisfied by a quorum.  They must succeed on every
JournalNode in the cluster.  If the operation succeeds on some nodes, but fails on others,
then this may leave the nodes in an inconsistent state and require operations to do manual
recovery steps.  For example, if {{doPreUpgrade}} succeeds on 2 nodes and fails on 1 node,
then the operator will need to correct the problem on the failed node and also manually restore
the previous.tmp directory to current on the 2 successful nodes before reattempting the upgrade.



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