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https://issues.apache.org/jira/browse/HADOOP-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12495178
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Runping Qi commented on HADOOP-1342:
------------------------------------


Looks like the changes made on TestAggregates part were applied, but the 
changes on the aggregate code did not.

Can you try to re-apply the patch? Or send me the following files in your trunk:

ValueAggregatorBaseDescriptor.java and 
UniqValueCount.java

so that I can take a look at them.


> A configurable limit on the number of unique values should be set on the 
> UniqueValueCount and ValueHistogram aggregators
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1342
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1342
>             Project: Hadoop
>          Issue Type: Improvement
>            Reporter: Runping Qi
>         Assigned To: Runping Qi
>             Fix For: 0.14.0
>
>         Attachments: patch-1342.txt
>
>
> In the current implementation, the uniq number of values may increase 
> unbounded, causing out of memory eventually.

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