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https://issues.apache.org/jira/browse/SOLR-4743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638158#comment-13638158
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Hoss Man commented on SOLR-4743:
--------------------------------
Ravi: i can not reproduce the problem you are describing using Solr 3.6.2 with
the example configuration. Can you please provide more details about exactly
what your configuration looks like, and the full details of your logs for
several minutes during the time you see solr being unresponsive? ideally
provide some thread dumps (youcan use jstack) showing what solr is doing during
that time?
the steps i attempted to follow to reproduce...
1) start up the 3.6.2 solr example (cd example && java -jar start)
2) in another window, index all the example docs (cd example/exampledocs &&
java -jar post.jar *.xml)
3) curl 'http://localhost:8983/solr/select?q=*:*&group=true'
step #3 did infact produce a 400 error "Specify at least one field, function or
query to group by." with a logged stack trace matching the one you mentioned,
but nothing else appeared in the log after that -- no empty queries. and the
CPU did not spike or indicate any sort of infinite loop in solr. subsequent
attempts to use solr for other queries functioned normally
> Group query crashes server
> --------------------------
>
> Key: SOLR-4743
> URL: https://issues.apache.org/jira/browse/SOLR-4743
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 3.6.2
> Environment: CentOS release 5.9, Sun GlassFish Enterprise Server
> v2.1.1 Patch15
> Reporter: Ravi Kiran Bhaskar
> Priority: Critical
>
> If you specify group=true but don't specify group.query or group.field SOLR
> throws a SEVERE exception following which we see the empty queries and
> finally no responses via solrj and admin console gives numFound always equal
> to total number of docs in index (it's 21692 as shown below). Looks like the
> searcher goes for a spin once it encounters the exception. Such situation
> should have been gracefully handled
> EXCEPTION and QUERY
> --------------------
> [#|2013-04-19T23:47:53.363-0400|SEVERE|sun-appserver2.1.1|org.apache.solr.core.SolrCore|_ThreadID=26;_ThreadName=httpSSLWorkerThread-9001-17;_RequestID=2f
> 933642-cad0-40e5-86c6-65b00be9bb97;|org.apache.solr.common.SolrException:
> Specify at least one field, function or query to group by.
> at org.apache.solr.search.Grouping.execute(Grouping.java:228)
> at
> org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:372)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:186)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:1376)
> at
> org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:365)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:260)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:313)
> at
> org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
> at
> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
> at
> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
> at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
> at
> com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
> at
> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
> at
> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
> at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
> at
> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
> at
> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
> at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093)
> at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:291)
> at
> com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:670)
> at
> com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:601)
> at
> com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:875)
> at
> com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:365)
> at
> com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:285)
> at
> com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:221)
> at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:269)
> at
> com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:111)
> |#]
> [#|2013-04-19T23:47:53.365-0400|INFO|sun-appserver2.1.1|org.apache.solr.core.SolrCore|_ThreadID=26;_ThreadName=httpSSLWorkerThread-9001-17;|[core1]
> webapp=/solr path=/select
> params={q=astronomy\+&rows=10&start=0&facet=true&fq=source:"xxx.com"&fq=locations:("Maryland")&sort=score+desc&group=true}
> status=400 QTime=9 |#]
> EMPTY QUERY
> ------------
> [#|2013-04-20T17:35:50.933-0400|INFO|sun-appserver2.1.1|org.apache.solr.core.SolrCore|_ThreadID=26;_ThreadName=httpSSLWorkerThread-9001-6;|[core1]
> webapp=/solr path=/select params={} hits=21692 status=0 QTime=16 |#]
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