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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