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Posted to hdfs-dev@hadoop.apache.org by "Wei-Chiu Chuang (JIRA)" <ji...@apache.org> on 2017/08/02 05:33:00 UTC

[jira] [Created] (HDFS-12245) Update INodeId javadoc

Wei-Chiu Chuang created HDFS-12245:
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             Summary: Update INodeId javadoc
                 Key: HDFS-12245
                 URL: https://issues.apache.org/jira/browse/HDFS-12245
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
            Reporter: Wei-Chiu Chuang


The INodeId javadoc states that id 1 to 1000 is reserved and root inode id start from 1001. That is no longer true after HDFS-4434.

Also, it's a little weird in INodeId
{code}
  public static final long LAST_RESERVED_ID = 2 << 14 - 1;
  public static final long ROOT_INODE_ID = LAST_RESERVED_ID + 1;
{code}
It seems the intent was for LAST_RESERVED_ID to be (2^14) - 1 = 32767. But due to Java operator precedence, LAST_RESERVED_ID = 2^(14-1) = 16384. Maybe it doesn't matter, not sure.



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