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Posted to common-dev@hadoop.apache.org by "Stefan Podkowinski (JIRA)" <ji...@apache.org> on 2009/03/10 16:19:03 UTC

[jira] Created: (HADOOP-5454) SortedMapWritable: readFields() will not clear values before deserialization

SortedMapWritable: readFields() will not clear values before deserialization
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                 Key: HADOOP-5454
                 URL: https://issues.apache.org/jira/browse/HADOOP-5454
             Project: Hadoop Core
          Issue Type: Bug
            Reporter: Stefan Podkowinski
             Fix For: 0.19.2


In case SortedMapWritable is used as value in a reducer, the user must explicitly call clear() on the map between iterating values. This is because SortedMapWritable will be reused once instantiated, but consecutive calls to readFields() will not reset the maps internal state, as e.g. done by MapWritable. Please add this.instance.clear(); on top of readFields().
You may also want to consider HADOOP-5028 for fixing another issue with this class.


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