An earlier fix, for HADOOP-4373, results in a problem with reclaiming capacity
when one or more queues have a capacity equal to zero
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Key: HADOOP-4988
URL: https://issues.apache.org/jira/browse/HADOOP-4988
Project: Hadoop Core
Issue Type: Bug
Components: contrib/capacity-sched
Reporter: Vivek Ratan
Priority: Blocker
HADOOP-4373 introduced a fix for queues with guaranteed capacity (gc) equal to
zero. Part of the fix was in the queue comparator used to sort queues. Queues
with gc=0 were placed at the end. This causes a problem with the code for
reclaiming capacity, which assumes that queues are sorted based on free space
available and that a queue with gc=0 is no different than a queue which is
running at capacity. Because of this, the following problem can arise: if we
have a system with at least one queue whose gc=0, we may fail to reclaim
capacity for some queues.
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