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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5781) Use a map to record the mapping between FSEditLogOpCode and the corresponding byte value
Date Wed, 15 Jan 2014 19:44:41 GMT
Jing Zhao created HDFS-5781:
-------------------------------

             Summary: Use a map to record the mapping between FSEditLogOpCode and the corresponding
byte value
                 Key: HDFS-5781
                 URL: https://issues.apache.org/jira/browse/HDFS-5781
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode
    Affects Versions: 2.4.0
            Reporter: Jing Zhao
            Assignee: Jing Zhao


HDFS-5674 uses Enum.values and enum.ordinal to identify an editlog op for a given byte value.
While improving the efficiency, it may cause issue. E.g., when several new editlog ops are
added to trunk around the same time (for several different new features), it is hard to backport
the editlog ops with larger byte values to branch-2 before those with smaller values, since
there will be gaps in the byte values of the enum. 

This jira plans to still use a map to record the mapping between editlog ops and their byte
values. 



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