[
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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
