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From "Ari Rabkin (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3961) resource estimation works badly in some cases
Date Fri, 15 Aug 2008 21:39:44 GMT
resource estimation works badly in some cases
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                 Key: HADOOP-3961
                 URL: https://issues.apache.org/jira/browse/HADOOP-3961
             Project: Hadoop Core
          Issue Type: Bug
            Reporter: Ari Rabkin
            Priority: Blocker


The disk space estimation introduced in HADOOP-657 performs badly under some circumstances.
 In particular, if maps have very small output, the initial estimate of output size equals
input size throws everything off.

Fix is to use a smaller initial estimate, and to update it appropriately.

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