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Posted to common-dev@hadoop.apache.org by "Christian Kunz (JIRA)" <ji...@apache.org> on 2009/06/18 22:02:08 UTC

[jira] Created: (HADOOP-6081) pipes combiner has a large memory footprint

pipes combiner has a large memory footprint
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                 Key: HADOOP-6081
                 URL: https://issues.apache.org/jira/browse/HADOOP-6081
             Project: Hadoop Core
          Issue Type: Bug
          Components: pipes
    Affects Versions: 0.18.3
            Reporter: Christian Kunz


Pipes combiner implementation can have a huge memory overhead compared to the spill size. How much, depends on the record size. E.g., an application asks for >2GB memory when io.sort.mb=500, key is 16 bytes, and value is 4 bytes.

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