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From "Vivek Ratan (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4988) An earlier fix, for HADOOP-4373, results in a problem with reclaiming capacity when one or more queues have a capacity equal to zero
Date Wed, 07 Jan 2009 11:26:44 GMT
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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