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Posted to hdfs-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2009/12/27 08:15:29 UTC

[jira] Created: (HDFS-854) Datanode should scan devices in parallel to generate block report

Datanode should scan devices in parallel to generate block report
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                 Key: HDFS-854
                 URL: https://issues.apache.org/jira/browse/HDFS-854
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node
            Reporter: dhruba borthakur


A Datanode should scan its disk devices in parallel so that the time to generate a block report is reduced. This will reduce the startup time of a cluster.
A datanode has 12 disk (each of 1 TB) to store HDFS blocks. There is a total of 150K blocks on these 12 disks. It takes the datanode upto 20 minutes to scan these devices to generate the first block report.

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