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From "Atri Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-8929) Early Terminating CollectorManager
Date Thu, 25 Jul 2019 10:38:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-8929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16892643#comment-16892643
] 

Atri Sharma commented on LUCENE-8929:
-------------------------------------

Ok, so I have been working on this and am wondering what the definition (parameter) of a globally
competitive hit be. Should it be the largest of the worst accepted hit across all collectors,
and all collectors use that as the minimum threshold when filtering further hits?

> Early Terminating CollectorManager
> ----------------------------------
>
>                 Key: LUCENE-8929
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8929
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Atri Sharma
>            Priority: Major
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> We should have an early terminating collector manager which accurately tracks hits across
all of its collectors and determines when there are enough hits, allowing all the collectors
to abort.
> The options for the same are:
> 1) Shared total count : Global "scoreboard" where all collectors update their current
hit count. At the end of each document's collection, collector checks if N > threshold,
and aborts if true
> 2) State Reporting Collectors: Collectors report their total number of counts collected
periodically using a callback mechanism, and get a proceed or abort decision.
> 1) has the overhead of synchronization in the hot path, 2) can collect unnecessary hits
before aborting.
> I am planning to work on 2), unless objections



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