[ https://issues.apache.org/jira/browse/MAPREDUCE-2705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Graves updated MAPREDUCE-2705: ------------------------------------- Attachment: MAPREDUCE-2705-branch20.patch patch for branch-0.20-security > tasks localized and launched serially by TaskLauncher - causing other tasks > to be delayed > ----------------------------------------------------------------------------------------- > > Key: MAPREDUCE-2705 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-2705 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: tasktracker > Affects Versions: 0.20.205.0, 0.23.0 > Reporter: Thomas Graves > Assignee: Thomas Graves > Fix For: 0.20.205.0, 0.23.0 > > Attachments: MAPREDUCE-2705-branch20.patch > > > The current TaskLauncher serially launches new tasks one at a time. During > the launch it does the localization and then starts the map/reduce task. > This can cause any other tasks to be blocked waiting for the current task to > be localized and started. In some instances we have seen a task that has a > large file to localize (1.2MB) block another task for about 40 minutes. This > particular task being blocked was a cleanup task which caused the job to be > delayed finishing for the 40 minutes. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira