Wang XL created HDFS-13657:
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             Summary: INodeId's LAST_RESERVED_ID may not as expected and the 
comment is misleading 
                 Key: HDFS-13657
                 URL: https://issues.apache.org/jira/browse/HDFS-13657
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
            Reporter: Wang XL


The comment of class INodeId is misleading. In the comment, Id 1 to 1000 are 
reserved for potential future usage, but code\{{public static final long 
LAST_RESERVED_ID = 2 << 14 - 1}} will result 1 to 16384 are reserved. At the 
same time , operator '-' priority is higher than '<<', \{{2 << 14 - 1}} is not 
equal to \{{(2 <<14) - 1}}.



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