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https://issues.apache.org/jira/browse/HADOOP-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12495185
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Runping Qi commented on HADOOP-1342:
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That explained why the unit test failed.
The patch failed to apply because r537300 did some format change on
TestAggregates.java, which caused conflicts.
I will re-generate the patch next.
> 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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