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Posted to common-dev@hadoop.apache.org by "Runping Qi (JIRA)" <ji...@apache.org> on 2007/05/11 16:01:18 UTC

[jira] Updated: (HADOOP-1342) A configurable limit on the number of unique values should be set on the UniqueValueCount and ValueHistogram aggregators

     [ https://issues.apache.org/jira/browse/HADOOP-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Runping Qi updated HADOOP-1342:
-------------------------------

    Attachment: patch-1342.txt

This patch added a limit on the number of unique values for UniqueValueCount aggregator. If the actual number of values is greater than the limit, the counter will be limit + 1.

The limit is under the attribute name: "aggregate.max.num.unique.values".
It can be set by calling job.setLong("aggregate.max.num.unique.values", 200).
The default is Long.MAX_VALUE (same as the current behavior).


> 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
>         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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