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Date: Tue, 28 Sep 2010 17:04:39 -0400 (EDT)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1368) Add a block counter to
 DatanodeDescriptor
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    [ https://issues.apache.org/jira/browse/HDFS-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12915923#action_12915923 ] 

Hairong Kuang commented on HDFS-1368:
-------------------------------------

Yes, you are right. It's BlockInfo defined in BlocksMap. I will create a patch to remove this method.

> 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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