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https://issues.apache.org/jira/browse/PHOENIX-3000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333239#comment-15333239
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Lars Hofhansl commented on PHOENIX-3000:
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We should probably also keep track of the size of the map during aggregate and
fail if we're over some threshold to keep the region server safe.
> Reduce memory consumption during DISTINCT aggregation
> -----------------------------------------------------
>
> Key: PHOENIX-3000
> URL: https://issues.apache.org/jira/browse/PHOENIX-3000
> Project: Phoenix
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Attachments: 3000.txt
>
>
> In {{DistinctValueWithCountServerAggregator.aggregate}} we hold on the ptr
> handed to us from HBase.
> Note that this pointer points into an HFile Block, and hence we hold onto the
> entire block for the duration of the aggregation.
> If the column has high cardinality we might attempt holding the entire table
> in memory in the extreme case.
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