[jira] [Assigned] (CRUNCH-183) Reservoir sampling functions don't take object reuse into account

["Gabriel Reid (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CRUNCH-183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gabriel Reid reassigned CRUNCH-183:
-----------------------------------

    Assignee: Gabriel Reid
    
> 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
>            Assignee: Gabriel Reid
>         Attachments: CRUNCH-183.patch
>
>
> 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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