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https://issues.apache.org/jira/browse/DIRSERVER-1161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12587882#action_12587882
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Norval Hope commented on DIRSERVER-1161:
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So far my testing of the "spawn a thread to iterate through the search results" 
approach looks very promising. I'll do further testing before tidying up 
(probably use an Executor etc) and submitting a patch against 1.5.1 and any 
other releases of interest.

> search results are not streamed to the client until final done response is 
> queued
> ---------------------------------------------------------------------------------
>
>                 Key: DIRSERVER-1161
>                 URL: https://issues.apache.org/jira/browse/DIRSERVER-1161
>             Project: Directory ApacheDS
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.0
>         Environment: JDK 1.5.0_11 
>            Reporter: Norval Hope
>         Attachments: apacheds_1.5.1_streaming.patch, 
> apacheds_1.5.1_streaming_log_output.txt, installers_1.5.1_streaming.patch, 
> mina_1.1.2_streaming.patch, pom.xml, streaming_log_output.txt, 
> streaming_logging.patch
>
>   Original Estimate: 120h
>  Remaining Estimate: 120h
>
> Search results accumulate in Events on the SessionBuffer.eventQueue within 
> ExecutorFilter.fireEvent() until final done response for the search is 
> written to the session and then all results for the search (possibly millions 
> depending on the search and state of the directory) are written out at once. 
> This is a big problem for scalability and I gather from previous 
> correspondence with Alex that this behaviour is unexpected.

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