[ https://issues.apache.org/jira/browse/HDFS-854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jakob Homan updated HDFS-854: ----------------------------- Hadoop Flags: [Reviewed] +1. TestDataNodeScanner passes with the patch on my box - Hudson's acting up again. Other test failure is unrelated. Unless there are more comments, I'll commit this this evening. > 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 > Affects Versions: 0.22.0 > Reporter: dhruba borthakur > Assignee: Dmytro Molkov > Fix For: 0.22.0 > > Attachments: HDFS-854-2.patch, HDFS-854.patch, HDFS-854.patch.1 > > > 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.