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https://issues.apache.org/jira/browse/SOLR-13240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16881143#comment-16881143
 ] 

Tim Owen commented on SOLR-13240:
---------------------------------

Thanks for following up on this Christine.. updated patch looks good to me.

Disclaimer.. we've not tried this patch against the master branch, as we're 
using 7.x in production.

 

> UTILIZENODE action results in an exception
> ------------------------------------------
>
>                 Key: SOLR-13240
>                 URL: https://issues.apache.org/jira/browse/SOLR-13240
>             Project: Solr
>          Issue Type: Bug
>          Components: AutoScaling
>    Affects Versions: 7.6
>            Reporter: Hendrik Haddorp
>            Priority: Major
>         Attachments: SOLR-13240.patch, SOLR-13240.patch, solr-solrj-7.5.0.jar
>
>
> When I invoke the UTILIZENODE action the REST call fails like this after it 
> moved a few replicas:
> {
>   "responseHeader":{
>     "status":500,
>     "QTime":40220},
>   "Operation utilizenode caused 
> exception:":"java.lang.IllegalArgumentException:java.lang.IllegalArgumentException:
>  Comparison method violates its general contract!",
>   "exception":{
>     "msg":"Comparison method violates its general contract!",
>     "rspCode":-1},
>   "error":{
>     "metadata":[
>       "error-class","org.apache.solr.common.SolrException",
>       "root-error-class","org.apache.solr.common.SolrException"],
>     "msg":"Comparison method violates its general contract!",
>     "trace":"org.apache.solr.common.SolrException: Comparison method violates 
> its general contract!\n\tat 
> org.apache.solr.client.solrj.SolrResponse.getException(SolrResponse.java:53)\n\tat
>  
> org.apache.solr.handler.admin.CollectionsHandler.invokeAction(CollectionsHandler.java:274)\n\tat
>  
> org.apache.solr.handler.admin.CollectionsHandler.handleRequestBody(CollectionsHandler.java:246)\n\tat
>  
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)\n\tat
>  
> org.apache.solr.servlet.HttpSolrCall.handleAdmin(HttpSolrCall.java:734)\n\tat 
> org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:715)\n\tat
>  org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:496)\n\tat 
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377)\n\tat
>  
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323)\n\tat
>  
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)\n\tat
>  
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)\n\tat
>  
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)\n\tat
>  
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)\n\tat
>  
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)\n\tat
>  
> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)\n\tat
>  
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)\n\tat
>  
> org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)\n\tat
>  
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)\n\tat
>  
> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)\n\tat
>  
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)\n\tat
>  
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)\n\tat
>  
> org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)\n\tat
>  
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)\n\tat
>  
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)\n\tat
>  
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:219)\n\tat
>  
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)\n\tat
>  
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)\n\tat
>  
> org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)\n\tat
>  
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)\n\tat
>  org.eclipse.jetty.server.Server.handle(Server.java:531)\n\tat 
> org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)\n\tat 
> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)\n\tat
>  
> org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)\n\tat
>  org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)\n\tat 
> org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)\n\tat 
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)\n\tat
>  
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)\n\tat
>  
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)\n\tat
>  
> org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)\n\tat
>  
> org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)\n\tat
>  
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)\n\tat
>  
> org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)\n\tat
>  java.lang.Thread.run(Thread.java:748)\n",
>     "code":500}} 
> The logs show this additional exception:
> 2019-02-10 00:09:00.539 ERROR 
> (OverseerThreadFactory-1268-thread-38-processing-n:agent2:9151_solr) [   ] 
> o.a.s.c.a.c.OverseerCollectionMessageHandler Operation utilizenode 
> failed:java.lang.IllegalArgumentException: Comparison method violates its 
> general contract!
>     at java.util.TimSort.mergeLo(TimSort.java:777)
>     at java.util.TimSort.mergeAt(TimSort.java:514)
>     at java.util.TimSort.mergeCollapse(TimSort.java:439)
>     at java.util.TimSort.sort(TimSort.java:245)
>     at java.util.Arrays.sort(Arrays.java:1512)
>     at java.util.ArrayList.sort(ArrayList.java:1462)
>     at 
> org.apache.solr.client.solrj.cloud.autoscaling.MoveReplicaSuggester.tryEachNode(MoveReplicaSuggester.java:50)
>     at 
> org.apache.solr.client.solrj.cloud.autoscaling.MoveReplicaSuggester.init(MoveReplicaSuggester.java:38)
>     at 
> org.apache.solr.client.solrj.cloud.autoscaling.Suggester.getSuggestion(Suggester.java:187)
>     at 
> org.apache.solr.cloud.api.collections.UtilizeNodeCmd.call(UtilizeNodeCmd.java:100)
>     at 
> org.apache.solr.cloud.api.collections.OverseerCollectionMessageHandler.processMessage(OverseerCollectionMessageHandler.java:259)
>     at 
> org.apache.solr.cloud.OverseerTaskProcessor$Runner.run(OverseerTaskProcessor.java:478)
>     at 
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:209)
>     at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>     at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>     at java.lang.Thread.run(Thread.java:748) 
> I suspect this to be caused by this comparator: 
> https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/MoveReplicaSuggester.java#L98
> In case it is possible that both compared replicas are leaders the result 
> would not be correct.
> see also the mail thread about this:
> https://www.mail-archive.com/search?l=solr-u...@lucene.apache.org&q=subject:%22Re%5C%3A+CloudSolrClient+getDocCollection%22&o=newest&f=1



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