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https://issues.apache.org/jira/browse/LUCENE-6512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14563735#comment-14563735
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Uwe Schindler commented on LUCENE-6512:
---------------------------------------
{{_root_=<PK>}} is already on by default. I would propose to do the same for a
new {{_parent_=true}} field. This would be consistent. Is there a killswitch
for {{_root_}}? I did not find one, because to me this field is useless -
unless you want to delete documents (by this you can delete the parent and all
childs will be deleted, too). But the {{_parent_}} field should be mandatory
(and automatic). Because block join queries would never work without them!
In any case the missing check that lead to this issue was only detected by this
:-) But I would hope that Solr fixes this issue (maybe like described above).
> ToParentBlockJoinQuery fails with AIOOBE under certain circumstances
> --------------------------------------------------------------------
>
> Key: LUCENE-6512
> URL: https://issues.apache.org/jira/browse/LUCENE-6512
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/join
> Affects Versions: 4.10.4
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Attachments: LUCENE-6512.patch
>
>
> I had a customer using BlockJoin with Solr. He executed a block join query
> and the following appeared in Solr's logs:
> {noformat}
> 28 May 2015 17:19:20 ERROR (SolrException.java:131) -
> java.lang.ArrayIndexOutOfBoundsException: -1
> at org.apache.lucene.codecs.lucene40.BitVector.get(BitVector.java:149)
> at
> org.apache.lucene.search.join.ToParentBlockJoinQuery$BlockJoinScorer.nextDoc(ToParentBlockJoinQuery.java:293)
> at
> org.apache.lucene.search.Weight$DefaultBulkScorer.scoreAll(Weight.java:192)
> at
> org.apache.lucene.search.Weight$DefaultBulkScorer.score(Weight.java:163)
> at org.apache.lucene.search.BulkScorer.score(BulkScorer.java:35)
> at
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:621)
> at
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:297)
> at
> org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:209)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1619)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1433)
> at
> org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:514)
> at
> org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:484)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:218)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:1976)
> at
> org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:777)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:418)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
> at
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
> at
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
> at
> org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> I debugged this stuff and found out when this happens:
> The last block of documents was not followed by a parent. If one of the child
> documents without a parent at the end of the index match the inner query,
> scorer calls nextSetBit() to find next parent document. This returns -1.
> There is an assert afterwards that checks for -1, but in production code,
> this is of course never executed.
> If the index has deletetions the false -1 is passed to acceptDocs and then
> triggers the above problem.
> We should change the assert to another IllegalStateException() which is used
> to notify the user if the orthogonality is broken. By that the user gets the
> information that his index is broken and contains child documents without a
> parent at the very end of a segment.
> I have seen this on 4.10.4. Maybe thats already fixed in 5.0, but I just open
> this here for investigation. This was clearly a problem in the index, but due
> to Solr's buggy implementation of parent/child documents (you have to set the
> parent flag in contrast to Elasticsearch on your own - which is stupid!!!)
> this was not detected at indexing time. We should open an issue in Solr to
> fix this bad behaviour and make solr automatically add the parent field (it
> only adds a "_root_" field automatically, maybe it should also add a
> "_parent_" field automatically).
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