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https://issues.apache.org/jira/browse/HDFS-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14525787#comment-14525787
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Hadoop QA commented on HDFS-3862:
---------------------------------
(!) The patch artifact directory has been removed!
This is a fatal error for test-patch.sh. Aborting.
Jenkins (node H4) information at
https://builds.apache.org/job/PreCommit-HDFS-Build/10738/ may provide some
hints.
> QJM: don't require a fencer to be configured if shared storage has built-in
> single-writer semantics
> ---------------------------------------------------------------------------------------------------
>
> Key: HDFS-3862
> URL: https://issues.apache.org/jira/browse/HDFS-3862
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha
> Affects Versions: QuorumJournalManager (HDFS-3077)
> Reporter: Todd Lipcon
> Assignee: Yi Liu
> Attachments: HDFS-3862.001.patch, HDFS-3862.002.patch,
> HDFS-3862.003.patch
>
>
> Currently, NN HA requires that the administrator configure a fencing method
> to ensure that only a single NameNode may write to the shared storage at a
> time. Some shared edits storage implementations (like QJM) inherently enforce
> single-writer semantics at the storage level, and thus the user should not be
> forced to specify one.
> We should extend the JournalManager interface so that the HA code can operate
> without a configured fencer if the JM has such built-in fencing.
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