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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-529) More redundant block searches in BlockManager.
Date Wed, 05 Aug 2009 01:22:15 GMT
More redundant block searches in BlockManager.

                 Key: HDFS-529
                 URL: https://issues.apache.org/jira/browse/HDFS-529
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 0.21.0
            Reporter: Konstantin Shvachko
            Assignee: Konstantin Shvachko
             Fix For: 0.21.0

Found more redundant searches in {{BlockManager.addStoredBLock()}} and {{BlockManager.getNodes(Block)}}.
The pattern here is that we first call {{BlocksMap.numNodes(Block)}} in order to determine
the size of the array of data-nodes. This is one search in {{blocksMap}}. Then we call {{BlocksMap.nodeIterator(Block)}},
which also performs a search. This is all not necessary because we already have the block
in the form of BlockInfo from {{blocksMap}} and do not need to search for it.

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