Tasks are not scheduled even though task trackers have extra slots
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Key: HADOOP-5289
URL: https://issues.apache.org/jira/browse/HADOOP-5289
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Affects Versions: 0.19.0
Reporter: Runping Qi
I ran a job with 51 reduce tasks on a cluster with 13 task trackers running
Hadoop 0.19. Each task tracker has 5 reduce slots.
Initially, each task tracker accepted 4 reduce tasks as expected. However, 3
task trackers were put into blacklist because many tasks failed on them.
However, those failed tasks stayed in pending state, not being scheduled to
other task trackers, even though each of the other healthy tracker has one free
slot.
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