[jira] [Created] (HDFS-5794) Fix the inconsistency of layout version number of ADD_DATANODE_AND_STORAGE_UUIDS between trunk and branch-2

["Jing Zhao (JIRA)" <ji...@apache.org>]

Jing Zhao created HDFS-5794:
-------------------------------

             Summary: Fix the inconsistency of layout version number of ADD_DATANODE_AND_STORAGE_UUIDS between trunk and branch-2
                 Key: HDFS-5794
                 URL: https://issues.apache.org/jira/browse/HDFS-5794
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 3.0.0, 2.4.0
            Reporter: Jing Zhao
            Assignee: Jing Zhao


Currently in trunk, we have the layout version:
{code}
    EDITLOG_ADD_BLOCK(-48, ...),
    CACHING(-49, ...),
    ADD_DATANODE_AND_STORAGE_UUIDS(-50, ...);
{code}

And in branch-2, we have:
{code}
EDITLOG_SUPPORT_RETRYCACHE(-47, ...),
ADD_DATANODE_AND_STORAGE_UUIDS(-49, -47, ...);
{code}

We plan to backport HDFS-5704 and HDFS-5777 to branch-2, thus EDITLOG_ADD_BLOCK will also take -48 in branch-2. However, we cannot change ADD_DATANODE_AND_STORAGE_UUIDS to -50 in branch-2. Otherwise fsimages written by trunk and branch-2 have the same layout -50 but branch-2 cannot read the -50 fsimage if it is written by trunk.



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