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https://issues.apache.org/jira/browse/HDFS-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12915575#action_12915575
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Hairong Kuang commented on HDFS-1368:
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Suresh, you meant BlocksMap#listCount, right? Yeah, we probably should remove
it since it is not used anywhere else.
> 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
>
> Attachments: blockCounter.patch
>
>
> 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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