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https://issues.apache.org/jira/browse/APEXMALHAR-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429142#comment-15429142
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Thomas Weise commented on APEXMALHAR-2193:
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These are all things that were solved in HDHT so we should look there. Since 
these are not cheap collections (even though they are made look cheap), we 
really need to understand what happens at the storage layer. It should not 
actually delete or update immediately but changes go into a write buffer which 
gets periodically flushed. Please check how managed state works and that it is 
used correctly.


> Implement SpillableByteArrayListMultimapImpl.remove(@Nullable Object key, 
> @Nullable Object value)
> -------------------------------------------------------------------------------------------------
>
>                 Key: APEXMALHAR-2193
>                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-2193
>             Project: Apache Apex Malhar
>          Issue Type: Sub-task
>            Reporter: David Yan
>            Assignee: David Yan
>
> This is needed by SpillableSessionWindowedStorage. It needs a way to remove 
> the session window given the key in its internal keyToWindowsMap



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