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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-183) Reservoir sampling functions don't take object reuse into account
Date Sun, 24 Mar 2013 15:17:15 GMT
Gabriel Reid created CRUNCH-183:
-----------------------------------

             Summary: Reservoir sampling functions don't take object reuse into account
                 Key: CRUNCH-183
                 URL: https://issues.apache.org/jira/browse/CRUNCH-183
             Project: Crunch
          Issue Type: Bug
            Reporter: Gabriel Reid


ReservoirSampleFn and WRSCombineFn in o.a.c.lib.SampleUtils both hold onto references of processed
values, but don't make deep copies of them. For complex objects such as Avro objects, this
leads to incorrect results, with the same value being returned for all samples.

This can be resolved by making use of PType#getDetachedValue before storing a reference to
the object.

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