Datanode should scan devices in parallel to generate block report -----------------------------------------------------------------
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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.