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https://issues.apache.org/jira/browse/SOLR-5709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13904063#comment-13904063
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Steve Rowe commented on SOLR-5709:
----------------------------------
Rob,
I see what you mean: ngroups should be the same as the number of groups. This
problem still happens when I don't request highlighting, so it appears to be a
problem with grouping only.
This may be related to a known issue - from the {{group.ngroups}} description
on [http://wiki.apache.org/solr/FieldCollapsing]:
{quote}
WARNING: If this parameter is set to true on a sharded environment, all the
documents that belong to the same group have to be located in the same shard,
otherwise the count will be incorrect. If you are using SolrCloud, consider
using "custom hashing"
{quote}
I'll do some more testing.
> Highlighting grouped duplicate docs from different shards with group.limit >
> 1 throws ArrayIndexOutOfBoundsException
> --------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-5709
> URL: https://issues.apache.org/jira/browse/SOLR-5709
> Project: Solr
> Issue Type: Bug
> Components: highlighter
> Affects Versions: 4.3, 4.4, 4.5, 4.6, 5.0
> Reporter: Steve Rowe
> Assignee: Steve Rowe
> Fix For: 4.7, 5.0
>
> Attachments: SOLR-5709.patch
>
>
> In a sharded (non-SolrCloud) deployment, if you index a document with the
> same unique key value into more than one shard, and then try to highlight
> grouped docs with more than one doc per group, where the grouped docs contain
> at least one duplicate doc pair, you get an AIOOBE.
> Here's the stack trace I got from such a situation, with 1 doc indexed into
> each shard in a 2-shard index, with {{group.limit=2}}:
> {noformat}
> ERROR null:java.lang.ArrayIndexOutOfBoundsException: 1
> at
> org.apache.solr.handler.component.HighlightComponent.finishStage(HighlightComponent.java:185)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:328)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:1916)
> at
> org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:758)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:412)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:202)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
> at
> org.apache.solr.client.solrj.embedded.JettySolrRunner$DebugFilter.doFilter(JettySolrRunner.java:136)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:229)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
> at
> org.eclipse.jetty.server.handler.GzipHandler.handle(GzipHandler.java:301)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1077)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
> at org.eclipse.jetty.server.Server.handle(Server.java:368)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:942)
> at
> org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1004)
> at
> org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640)
> at
> org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
> at
> org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
> at
> org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)
> at
> org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
> at java.lang.Thread.run(Thread.java:724)
> {noformat}
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