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Posted to dev@avro.apache.org by "Dave Beech (JIRA)" <ji...@apache.org> on 2012/12/12 10:05:21 UTC

[jira] [Created] (AVRO-1219) Add support for grouping comparators without an implementation of the RawComparator interface

Dave Beech created AVRO-1219:
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             Summary: Add support for grouping comparators without an implementation of the RawComparator interface
                 Key: AVRO-1219
                 URL: https://issues.apache.org/jira/browse/AVRO-1219
             Project: Avro
          Issue Type: Improvement
          Components: java
    Affects Versions: 1.7.3
            Reporter: Dave Beech
            Assignee: Dave Beech
            Priority: Minor


>From http://mail-archives.apache.org/mod_mbox/avro-user/201212.mbox/%3CCAFZSZPvKcSTf84hwqOhZ7OchtcnxmDwp1krYaaq2qsLDtV0brw%40mail.gmail.com%3E
 
Summary:
If you want to use a grouping comparator with the "new" mapreduce API and Avro, you must provide an implementation of RawComparator compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2).

In standard mapreduce, you don't have to do this. Hadoop does it for you behind the scenes by deserializing the writables and calling compare(x,y)
instead.

We should provide a subclass of AvroKeyComparator which does the deserialization and delegates to compare(x,y) to be consistent with Hadoop mapreduce. 

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