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Posted to dev@hive.apache.org by "Gunther Hagleitner (JIRA)" <ji...@apache.org> on 2013/12/25 20:10:50 UTC

[jira] [Created] (HIVE-6105) LongWritable.compareTo needs shimming

Gunther Hagleitner created HIVE-6105:
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             Summary: LongWritable.compareTo needs shimming
                 Key: HIVE-6105
                 URL: https://issues.apache.org/jira/browse/HIVE-6105
             Project: Hive
          Issue Type: Bug
    Affects Versions: 0.12.0
            Reporter: Gunther Hagleitner


Compiled hive against hadoop-2. Running tests on hadoop 1 gives:

Caused by: java.lang.NoSuchMethodError: org.apache.hadoop.io.LongWritable.compareTo(Lorg/apache/hadoop/io/LongWritable;)I
	at org.apache.hadoop.hive.ql.udf.UDAFPercentile$MyComparator.compare(UDAFPercentile.java:62)
	at org.apache.hadoop.hive.ql.udf.UDAFPercentile$MyComparator.compare(UDAFPercentile.java:58)
	at java.util.Arrays.mergeSort(Arrays.java:1270)
	at java.util.Arrays.sort(Arrays.java:1210)
	at java.util.Collections.sort(Collections.java:157)
	at org.apache.hadoop.hive.ql.udf.UDAFPercentile$PercentileLongEvaluator.terminate(UDAFPercentile.java:194)
	... 20 more

I think the problem is that the compareTo function has changed from using Object to using LongWritable as an argument. Seems this needs a shim. However, we should also make sure that this shim doesn't hit performance too hard.



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