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https://issues.apache.org/jira/browse/HDFS-529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HDFS-529:
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Attachment: BlocksMap.patch
By replacing type {{Block}} with {{BlockInfo}} for local variables and methods
the patch avoids unnecessary searches.
> 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
>
> Attachments: BlocksMap.patch
>
>
> 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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