More redundant block searches in BlockManager.
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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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