You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@lucene.apache.org by "Stanislav Livotov (JIRA)" <ji...@apache.org> on 2019/05/18 00:11:00 UTC
[jira] [Comment Edited] (SOLR-12688) LTR Multiple performance fixes
+ pure DocValues support for FieldValueFeature
[ https://issues.apache.org/jira/browse/SOLR-12688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842818#comment-16842818 ]
Stanislav Livotov edited comment on SOLR-12688 at 5/18/19 12:10 AM:
--------------------------------------------------------------------
Hi [~kamalkishore]
EFI params are not the part of the model, EFI features location in for example {{MultipleAdditiveTreesModel}} or efi params weights in {{LinearModel}} are not changing in a request.
The efi params are stored in {{LTRScoringQuery}} which is created on each request. The same for query related features.
And please note that this optimisation is already in master. https://issues.apache.org/jira/browse/SOLR-12699
was (Author: slivotov):
Hi [~kamalkishore]
EFI params are not the part of the model, EFI features location in for example {{MultipleAdditiveTreesModel}} or efi params weights in {{LinearModel}} are not changing in a request.
The efi params are stored in {{LTRScoringQuery}} which is created on each request. The same for query related features.
> LTR Multiple performance fixes + pure DocValues support for FieldValueFeature
> -----------------------------------------------------------------------------
>
> Key: SOLR-12688
> URL: https://issues.apache.org/jira/browse/SOLR-12688
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: contrib - LTR
> Reporter: Stanislav Livotov
> Priority: Major
> Attachments: DocValuesSupportForFieldValueFeature.patch, LTRModelHashCodeAfter.png, LTRModelHashCodeBefore.png, LTRScoringModelHashCodeCaching.patch, LTRSolrFeatureAfter.png, LTRSolrFeatureBefore.png, LTRwithDVOptimisation.png, LTRwithoutDVOptimisation.png, MultiplePerformanceFixes.patch, NoFQSolrFeatureOptimisation.patch
>
>
> This ticket is related to 2 performance and 1 functional/performance issue that I had found during integrating LTR in our e-commerce search engine :
> # FieldValueFeature doesn't support pure DocValues fields (Stored false). Please also note that for fields which are both stored and DocValues it is working not optimal because it is extracting just one field from the stored document. DocValues are obviously faster for such usecases. Below are screenshots of JFR profiles without and with new support of DocValues for the case when it can be read from DocValues.
> !LTRwithoutDVOptimisation.png!
> !LTRwithDVOptimisation.png!
> # SolrFeature was not optimally implemented for the case when no fq parameter was passed. I'm not absolutely sure what was the intention to introduce both q(which is supposed to be a function query) and fq parameter for the same SolrFeature at all(Is there a case when they will be used together ? ), so I decided not to change behavior but just optimize described case !LTRSolrFeatureBefore.png! !LTRSolrFeatureAfter.png!
> # LTRScoringModel was a mutable object. It was leading to the calculation of hashcode on each query, which in turn can consume a lot of time in cases when a model is big(In our case we were using LambdaMART with 100 trees and leaves which was consuming 3MB of the disk space). So I decided to make LTRScoringModel immutable and cache hashCode calculation. Below are the screenshots before and after. !LTRModelHashCodeBefore.png!!LTRModelHashCodeAfter.png!
> In our case, we had a feature.json file with 8 FieldValueFeatures, 5 SolrFeatures and 1 OriginalScoreFeature.
> Before introducing the optimizations performance overhead for LTR reranking of top 48 documents was 300ms. With all the optimizations in it was decreased to 35ms.
> Please also note that JFR screenshots were captured on Solr 6.6 codebase. All the numbers are also taken from Solr version 6.6.
> I hope that changes of the DocValues interface(method get() was removed and advanceExact was added) won't affect it (At least for DenseNumericDocValues it will work as expected.)
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org