The exact version as shown by the UI is:
- solr-impl   5.3.0 1696229 - noble - 2015-08-17 17:10:43
- lucene-impl 5.3.0 1696229 - noble - 2015-08-17 16:59:03

Unfortunately my skills in debugging are limited. So I'm not sure about a 'deeper caller stack'. Did you mean the attached snapshot from VirtualVM, a stack trace like below or something else? Please give me a hint.

uwe

"qtp1734853116-68" #68 prio=5 os_prio=64 tid=0x00000000117fd800 nid=0x77 
runnable [0xfffffd7f991fc000]
   java.lang.Thread.State: RUNNABLE
        at java.util.HashMap.resize(HashMap.java:734)
        at java.util.HashMap.putVal(HashMap.java:662)
        at java.util.HashMap.put(HashMap.java:611)
        at 
org.apache.lucene.index.FieldInfos$Builder.addOrUpdateInternal(FieldInfos.java:344)
        at org.apache.lucene.index.FieldInfos$Builder.add(FieldInfos.java:366)
        at org.apache.lucene.index.FieldInfos$Builder.add(FieldInfos.java:304)
        at 
org.apache.lucene.index.MultiFields.getMergedFieldInfos(MultiFields.java:245)
        at 
org.apache.lucene.index.SlowCompositeReaderWrapper.getFieldInfos(SlowCompositeReaderWrapper.java:237)
        at 
org.apache.lucene.index.SlowCompositeReaderWrapper.getSortedSetDocValues(SlowCompositeReaderWrapper.java:174)
        at 
org.apache.solr.request.DocValuesFacets.getCounts(DocValuesFacets.java:72)
        at 
org.apache.solr.request.SimpleFacets.getTermCounts(SimpleFacets.java:492)
        at 
org.apache.solr.request.SimpleFacets.getTermCounts(SimpleFacets.java:385)
        at org.apache.solr.request.SimpleFacets$3.call(SimpleFacets.java:628)
        at org.apache.solr.request.SimpleFacets$3.call(SimpleFacets.java:619)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at org.apache.solr.request.SimpleFacets$2.execute(SimpleFacets.java:573)
        at 
org.apache.solr.request.SimpleFacets.getFacetFieldCounts(SimpleFacets.java:644)
        at 
org.apache.solr.handler.component.FacetComponent.getFacetCounts(FacetComponent.java:294)
        at 
org.apache.solr.handler.component.FacetComponent.process(FacetComponent.java:256)
        at 
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:285)
        at 
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:2068)
        at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:669)
        at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:462)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:210)
        at 
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:179)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
        at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:499)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
        at 
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
        at java.lang.Thread.run(Thread.java:745)



Am 22.09.2015 um 12:56 schrieb Mikhail Khludnev:
It's quite strange
https://issues.apache.org/jira/browse/SOLR-7730 significantly optimized DV
facets at 5.3.0 exactly by avoiding FileInfo merge.
Would you mind to provide deeper caller stack for
org.apache.lucene.index.FileInfos.MultibleFields.getMergedFieldInfos()?
Or a time spend in SlowCompositeReaderWrapper, DocValuesFacets,
MultiDocValues and their hot methods.
Which version you exactly on? and how do you know that?
Thanks


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