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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1368) Add a block counter to DatanodeDescriptor
Date Thu, 02 Sep 2010 23:04:33 GMT
Add a block counter to DatanodeDescriptor

                 Key: HDFS-1368
                 URL: https://issues.apache.org/jira/browse/HDFS-1368
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang
             Fix For: 0.22.0

Many of time, we need to count the total number of blocks in a datanode by calling DatanodeDescriptor#numBlocks().
It has to traverse the block list to get the counter, which may not be trivial if there are
millions of blocks. Adding a counter for each datanode does not cost much space but help save
CPU processing time.

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