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https://issues.apache.org/jira/browse/LUCENE-8542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16791357#comment-16791357
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Lucene/Solr QA commented on LUCENE-8542:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 1 new or modified test
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
38s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Release audit (RAT) {color} |
{color:green} 0m 32s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Check forbidden APIs {color} |
{color:green} 0m 27s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Validate source patterns {color} |
{color:green} 0m 27s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 15m
30s{color} | {color:green} core in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m
2s{color} | {color:green} facet in the patch passed. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 19m 49s{color} |
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | LUCENE-8542 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12950019/LUCENE-8542.patch |
| Optional Tests | compile javac unit ratsources checkforbiddenapis
validatesourcepatterns |
| uname | Linux lucene1-us-west 4.4.0-137-generic #163~14.04.1-Ubuntu SMP Mon
Sep 24 17:14:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | ant |
| Personality |
/home/jenkins/jenkins-slave/workspace/PreCommit-LUCENE-Build/sourcedir/dev-tools/test-patch/lucene-solr-yetus-personality.sh
|
| git revision | master / d8f2a02 |
| ant | version: Apache Ant(TM) version 1.9.3 compiled on July 24 2018 |
| Default Java | 1.8.0_191 |
| Test Results |
https://builds.apache.org/job/PreCommit-LUCENE-Build/174/testReport/ |
| modules | C: lucene lucene/core lucene/facet U: lucene |
| Console output |
https://builds.apache.org/job/PreCommit-LUCENE-Build/174/console |
| Powered by | Apache Yetus 0.7.0 http://yetus.apache.org |
This message was automatically generated.
> Provide the LeafSlice to CollectorManager.newCollector to save memory on
> small index slices
> -------------------------------------------------------------------------------------------
>
> Key: LUCENE-8542
> URL: https://issues.apache.org/jira/browse/LUCENE-8542
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Christoph Kaser
> Priority: Minor
> Attachments: LUCENE-8542.patch
>
>
> I have an index consisting of 44 million documents spread across 60 segments.
> When I run a query against this index with a huge number of results requested
> (e.g. 5 million), this query uses more than 5 GB of heap if the IndexSearch
> was configured to use an ExecutorService.
> (I know this kind of query is fairly unusual and it would be better to use
> paging and searchAfter, but our architecture does not allow this at the
> moment.)
> The reason for the huge memory requirement is that the search [will create a
> TopScoreDocCollector for each
> segment|https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java#L404],
> each one with numHits = 5 million. This is fine for the large segments, but
> many of those segments are fairly small and only contain several thousand
> documents. This wastes a huge amount of memory for queries with large values
> of numHits on indices with many segments.
> Therefore, I propose to change the CollectorManager - interface in the
> following way:
> * change the method newCollector to accept a parameter LeafSlice that can be
> used to determine the total count of documents in the LeafSlice
> * Maybe, in order to remain backwards compatible, it would be possible to
> introduce this as a new method with a default implementation that calls the
> old method - otherwise, it probably has to wait for Lucene 8?
> * This can then be used to cap numHits for each TopScoreDocCollector to the
> leafslice-size.
> If this is something that would make sense for you, I can try to provide a
> patch.
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