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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11157) Enhance documentation around cpLock
Date Fri, 18 Nov 2016 18:57:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15677451#comment-15677451
] 

Zhe Zhang commented on HDFS-11157:
----------------------------------

Pinging [~kihwal] [~andrew.wang] [~atm] to share some thoughts.

> Enhance documentation around cpLock
> -----------------------------------
>
>                 Key: HDFS-11157
>                 URL: https://issues.apache.org/jira/browse/HDFS-11157
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation, ha, namenode
>            Reporter: Zhe Zhang
>            Priority: Minor
>
> The {{cpLock}} was introduced in HDFS-7097. Among all operations allowed on SbNN, some
acquire this lock (e.g. {{restoreFailedStorage}}) and some do not, including {{metasave}},
{{refreshNodes}}, {{setSafeMode}}.
> We should enhance the documentation around {{cpLock}} to explain the above. Also, maybe
{{metasave}} and {{refreshNodes}} do not need fsn write lock?



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