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https://issues.apache.org/jira/browse/COLLECTIONS-852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17836596#comment-17836596
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Claude Warren commented on COLLECTIONS-852:
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Opened [https://github.com/apache/commons-collections/pull/476] to address
this issue
> LayeredBloomFilter needs a way to call clean without adding a new layer
> -----------------------------------------------------------------------
>
> Key: COLLECTIONS-852
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-852
> Project: Commons Collections
> Issue Type: Improvement
> Affects Versions: 4.5.0-M1
> Reporter: Claude Warren
> Assignee: Claude Warren
> Priority: Major
>
> Currently the LayeredBloomFilter has no mechanism to clean the filter without
> adding something.
> The only path to clean is to call next() adding a new layer or to add a
> filter which changes the state of the last layer. In some cases it is
> necessary to simply removed expired layers without changing the state of
> existing layers.
> This proposal is to add a clean() method to the LayeredBloomFilter that will
> cause the filterCleanup consumer on the LayerManager to execute thus removing
> any expired layers.
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