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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-971) Improve name node performance by adding a hostname to datanodes map
Date Mon, 05 Feb 2007 01:40:05 GMT
Improve name node performance by adding a hostname to datanodes map
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                 Key: HADOOP-971
                 URL: https://issues.apache.org/jira/browse/HADOOP-971
             Project: Hadoop
          Issue Type: Improvement
          Components: dfs
    Affects Versions: 0.11.0
            Reporter: Hairong Kuang
         Assigned To: Hairong Kuang
             Fix For: 0.12.0


A name node currently maintains a datanode map which maps a storage id to a dataNodeDescriptor.
When the name node needs to get a datanodeDescriptor by its name (hostname:port#) or by its
host name, it has to iterate through the data node set, which is very inefficent. I'd like
to add an additional map that maps a host name to an array list of DatanodeDescriptors that
contains all the data nodes running on the host. Since most of time a node runs only one data
node, the intial size of the array list is set to be 1.

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