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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7457) DatanodeID generates excessive garbage
Date Mon, 01 Dec 2014 18:35:12 GMT
Daryn Sharp created HDFS-7457:
---------------------------------

             Summary: DatanodeID generates excessive garbage
                 Key: HDFS-7457
                 URL: https://issues.apache.org/jira/browse/HDFS-7457
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.0-alpha, 3.0.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp


{{DatanodeID#getXferAddr}} is a dynamically generated string.  This string is repeatedly generated
for the hash code, equality, comparisons, and stringification.  Every DN->NN RPC method
calls {{DatanodeManager#getDatanode}} to validate if the node is registered, which involves
a call to {{getXferAddr}}.

The dynamic computation generates unnecessary trash that puts unnecessary pressure on the
GC.



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