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https://issues.apache.org/jira/browse/SOLR-12782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16631223#comment-16631223
 ] 

Lucene/Solr QA commented on SOLR-12782:
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| (x) *{color:red}-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}  1m 
25s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Release audit (RAT) {color} | 
{color:green}  1m 18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Check forbidden APIs {color} | 
{color:green}  1m 18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Validate source patterns {color} | 
{color:green}  1m 18s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 53m 18s{color} 
| {color:red} core in the patch failed. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 58m  9s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | solr.cloud.autoscaling.sim.TestSimExtremeIndexing |
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|| Subsystem || Report/Notes ||
| JIRA Issue | SOLR-12782 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12941594/SOLR-12782.patch |
| Optional Tests |  compile  javac  unit  ratsources  checkforbiddenapis  
validatesourcepatterns  |
| uname | Linux lucene1-us-west 4.4.0-130-generic #156~14.04.1-Ubuntu SMP Thu 
Jun 14 13:51:47 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | ant |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-SOLR-Build/sourcedir/dev-tools/test-patch/lucene-solr-yetus-personality.sh
 |
| git revision | master / 9481c1f |
| ant | version: Apache Ant(TM) version 1.9.3 compiled on July 24 2018 |
| Default Java | 1.8.0_172 |
| unit | 
https://builds.apache.org/job/PreCommit-SOLR-Build/192/artifact/out/patch-unit-solr_core.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-SOLR-Build/192/testReport/ |
| modules | C: solr/core U: solr/core |
| Console output | 
https://builds.apache.org/job/PreCommit-SOLR-Build/192/console |
| Powered by | Apache Yetus 0.7.0   http://yetus.apache.org |


This message was automatically generated.



> UninvertingReader can be avoided if there are no fields to uninvert
> -------------------------------------------------------------------
>
>                 Key: SOLR-12782
>                 URL: https://issues.apache.org/jira/browse/SOLR-12782
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: David Smiley
>            Assignee: David Smiley
>            Priority: Major
>         Attachments: SOLR-12782.patch, SOLR-12782.patch, SOLR-12782.patch, 
> SOLR-12782.patch
>
>
> Solr uses UninvertingReader to expose DocValues on fields that don't have 
> them, but do have indexed fields that can be inverted via the FieldCache. It 
> has an internal constructor that takes the input LeafReader and a mapping of 
> field name to UninvertingReader.Type. It builds a new FieldInfos that have 
> fields reflecting DocValues. There are two things I'd like to improve here:
>  # make this constructor private and instead insist you use a new wrap() 
> method that has the opportunity to return the input if there is nothing to 
> do. Effectively the logic today would move into this wrap method, and the 
> current constructor would be dead simple, and would take the FieldInfos.
>  # Do _not_ create a new {{FieldInfo}} object if the existing field is 
> suitable (it's DocValuesType can stay the same).  The savings here can really 
> add up on machines with many indexes & segments.  This is in fact what 
> motivated the patch.



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