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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11157) Enhance documentation around cpLock
Date Fri, 18 Nov 2016 18:56:59 GMT
Zhe Zhang created HDFS-11157:

             Summary: 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}},

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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