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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3862) QJM: don't require a fencer to be configured if shared storage has built-in single-writer semantics
Date Wed, 06 May 2015 03:39:56 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer updated HDFS-3862:
-----------------------------------
    Labels: BB2015-05-TBR  (was: )

> 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
>              Labels: BB2015-05-TBR
>         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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