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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