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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9715) Check storage ID uniqueness on datanode startup
Date Wed, 27 Jan 2016 22:55:39 GMT
Lei (Eddy) Xu created HDFS-9715:
-----------------------------------

             Summary: Check storage ID uniqueness on datanode startup
                 Key: HDFS-9715
                 URL: https://issues.apache.org/jira/browse/HDFS-9715
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
    Affects Versions: 2.7.2
            Reporter: Lei (Eddy) Xu
            Assignee: Lei (Eddy) Xu


We should fix this to check storage ID uniqueness on datanode startup. If someone has manually
edited the storage ID files, or if they have duplicated a directory (or re-added an old disk)
they could end up with a duplicate storage ID and not realize it. 

The HDFS-7575 fix does generate storage UUID for each storage, but not checks the uniqueness
of these UUIDs.



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