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https://issues.apache.org/jira/browse/LUCENE-7002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Adrien Grand reassigned LUCENE-7002:
------------------------------------
Assignee: Adrien Grand
> MultiCollector throws NPE when there is CollectTerminatedException is thrown
> by a subcollector
> ----------------------------------------------------------------------------------------------
>
> Key: LUCENE-7002
> URL: https://issues.apache.org/jira/browse/LUCENE-7002
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 5.4
> Reporter: John Wang
> Assignee: Adrien Grand
> Fix For: 5.5
>
>
> I am seeing this in our log:
> {noformat}
> Caused by: java.lang.NullPointerException
> at
> org.apache.lucene.search.MultiCollector$MultiLeafCollector.setScorer(MultiCollector.java:156)
> at
> org.apache.lucene.search.BooleanScorer$1$1.setScorer(BooleanScorer.java:50)
> at
> org.apache.lucene.search.Weight$DefaultBulkScorer.score(Weight.java:166)
> at
> org.apache.lucene.search.BooleanScorer$1.score(BooleanScorer.java:59)
> at
> org.apache.lucene.search.BooleanScorer$BulkScorerAndDoc.score(BooleanScorer.java:90)
> at
> org.apache.lucene.search.BooleanScorer.scoreWindowSingleScorer(BooleanScorer.java:313)
> at
> org.apache.lucene.search.BooleanScorer.scoreWindow(BooleanScorer.java:336)
> at
> org.apache.lucene.search.BooleanScorer.score(BooleanScorer.java:364)
> at org.apache.lucene.search.BulkScorer.score(BulkScorer.java:39)
> at
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:821)
> at
> org.apache.lucene.search.IndexSearcher$5.call(IndexSearcher.java:763)
> at
> org.apache.lucene.search.IndexSearcher$5.call(IndexSearcher.java:760)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> {noformat}
> Looks like
> {noformat}
> MultiCollector.removeCollector(i)
> {noformat}
> is called on line 176, the loop:
> {noformat}
> for (LeafCollector c : collectors) {
> c.setScorer(scorer);
> }
> {noformat}
> in setScorer can still step on it, on line 155.
> I am however, unable to reproduce that with a unit test.
> I made a copy of this class and added a null check in setScorer() and the
> problem goes away.
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