[ https://issues.apache.org/jira/browse/HDFS-270?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matt Foley reassigned HDFS-270: ------------------------------- Assignee: Matt Foley > DFS Upgrade should process dfs.data.dirs in parallel > ---------------------------------------------------- > > Key: HDFS-270 > URL: https://issues.apache.org/jira/browse/HDFS-270 > Project: Hadoop HDFS > Issue Type: Improvement > Reporter: Stu Hood > Assignee: Matt Foley > Priority: Minor > > I just upgraded from 0.14.2 to 0.15.0, and things went very smoothly, if a > little slowly. > The main reason the upgrade took so long was the block upgrades on the > datanodes. Each of our datanodes has 3 drives listed for the dfs.data.dir > parameter. From looking at the logs, it is fairly clear that the upgrade > procedure does not attempt to upgrade all listed dfs.data.dir's in parallel. > I think even if all of your dfs.data.dir's are on the same physical device, > there would still be an advantage to performing the upgrade process in > parallel. The less downtime, the better: especially if it is potentially 20 > minutes versus 60 minutes. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.