tasks localized and launched serially by TaskLauncher - causing other tasks to
be delayed
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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
Reporter: Thomas Graves
Assignee: Thomas Graves
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.
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