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Posted to hdfs-issues@hadoop.apache.org by "Yi Liu (JIRA)" <ji...@apache.org> on 2014/08/12 12:45:13 UTC

[jira] [Assigned] (HDFS-3862) QJM: don't require a fencer to be configured if shared storage has built-in single-writer semantics

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

Yi Liu reassigned HDFS-3862:
----------------------------

    Assignee: Yi Liu

> 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
>
> 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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