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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