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Date: Wed, 6 Jun 2012 04:31:23 +0000 (UTC)
From: "suja s (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <659101099.42527.1338957083227.JavaMail.jiratomcat@issues-vm>
Subject: [jira] [Created] (HDFS-3512) Delay in scanning blocks at DN side
 when there are huge number of blocks
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suja s created HDFS-3512:
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             Summary: Delay in scanning blocks at DN side when there are huge number of blocks
                 Key: HDFS-3512
                 URL: https://issues.apache.org/jira/browse/HDFS-3512
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 2.0.1-alpha
            Reporter: suja s


Block scanner maintains the full list of blocks at DN side in a map and there is no differentiation between the blocks which are already scanned and the ones not scanend. For every check (ie every 5 secs) it will pick one block and scan. There are chances that it chooses a block which is already scanned which leads to further delay in scanning of blcoks which are yet to be scanned.


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