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