[jira] Created: (MAPREDUCE-1820) InputSampler does not create a deep copy of the key class when creating a sample, which causes problems with some formats like SequenceFile

["Alex Kozlov (JIRA)" <ji...@apache.org>]

InputSampler does not create a deep copy of the key class when creating a sample, which causes problems with some formats like SequenceFile<Text,Text>
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                 Key: MAPREDUCE-1820
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1820
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Alex Kozlov


I tried to use the InputSampler on a SequenceFile<Text,Text> and found that it comes up with duplicate keys in the sample.  The problem was tracked down to the fact that the Text object returned from the reader is essentially a wrapper pointing to a byte array, which changes as the sequence file reader progresses.  There was also a bug in that the reader should be initialized before the use.  The am attaching a patch that fixes both of the issues.  --Alex K

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