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Lucene/Solr QA commented on LUCENE-8542: ---------------------------------------- | (/) *{color:green}+1 overall{color}* | \\ \\ || 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} 1m 38s{color} | {color:green} master passed {color} | || || || || {color:brown} Patch Compile Tests {color} || | {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 51s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 51s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} Release audit (RAT) {color} | {color:green} 0m 30s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} Check forbidden APIs {color} | {color:green} 0m 20s{color} | {color:green} the patch passed {color} | | {color:green}+1{color} | {color:green} Validate source patterns {color} | {color:green} 0m 20s{color} | {color:green} the patch passed {color} | || || || || {color:brown} Other Tests {color} || | {color:green}+1{color} | {color:green} unit {color} | {color:green} 30m 12s{color} | {color:green} core in the patch passed. {color} | | {color:green}+1{color} | {color:green} unit {color} | {color:green} 3m 10s{color} | {color:green} facet in the patch passed. {color} | | {color:black}{color} | {color:black} {color} | {color:black} 40m 30s{color} | {color:black} {color} | \\ \\ || 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 lucene2-us-west.apache.org 4.4.0-112-generic #135-Ubuntu SMP Fri Jan 19 11:48:36 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 / 75b1831 | | ant | version: Apache Ant(TM) version 1.9.6 compiled on July 20 2018 | | Default Java | 1.8.0_191 | | Test Results | https://builds.apache.org/job/PreCommit-LUCENE-Build/127/testReport/ | | modules | C: lucene lucene/core lucene/facet U: lucene | | Console output | https://builds.apache.org/job/PreCommit-LUCENE-Build/127/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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org