What version of Solr? Do you have any of the autoscaling stuff turned
on? What about autoAddReplicas (which does not need Solr 7x)?
On Sat, Feb 9, 2019 at 4:35 PM Hendrik Haddorp <hendrik.hadd...@gmx.net> wrote:
>
> Hi,
>
> I have two Solr clouds using Version 7.6.0 with 4 nodes each and about
> 500 collections with one shard and a replication factor of 2 per Solr
> cloud. The data is stored in the HDFS. I restarted the nodes one by one
> and always waited for the replicas to fully recover before I restarted
> the next. Once the last node was restarted I noticed that Solr was
> starting to move replicas to other nodes. Actually it started to move
> all replicas from one node, which is now left empty. Is there any way to
> figure out why Solr decided to move all replicas to other nodes?
> The only problem that I see is that during the recovery the Solr
> instance logged a problem with the HDFS, claiming that the filesystem is
> closed. The recovery seems to have continued after that just fine though
> and the logs are clean for the time after wards.
> I restarted the node now and invoked the UTILIZENODE action that moved a
> few replicas back to the node but then failed with this exception:
>
> {
> "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$2.run(QueuedThreadPool.java:680)\n\tat
> java.lang.Thread.run(Thread.java:748)\n",
> "code":500}}
>
> When I invoke it again it moved a few more replicas but then failed in
> the same way again. The log has this additional exception:
> 2019-02-10 00:09:00.539 ERROR
> (OverseerThreadFactory-1268-thread-38-processing-n:agent2:9151_solr) [
> ] o.a.s.c.a.c.OverseerCollectionMessageHandler Operation utilizenode
> failed:java.lang.IllegalArgumentException: Comparison method violates
> its general contract!
> at java.util.TimSort.mergeLo(TimSort.java:777)
> at java.util.TimSort.mergeAt(TimSort.java:514)
> at java.util.TimSort.mergeCollapse(TimSort.java:439)
> at java.util.TimSort.sort(TimSort.java:245)
> at java.util.Arrays.sort(Arrays.java:1512)
> at java.util.ArrayList.sort(ArrayList.java:1462)
> at
> org.apache.solr.client.solrj.cloud.autoscaling.MoveReplicaSuggester.tryEachNode(MoveReplicaSuggester.java:50)
> at
> org.apache.solr.client.solrj.cloud.autoscaling.MoveReplicaSuggester.init(MoveReplicaSuggester.java:38)
> at
> org.apache.solr.client.solrj.cloud.autoscaling.Suggester.getSuggestion(Suggester.java:187)
> at
> org.apache.solr.cloud.api.collections.UtilizeNodeCmd.call(UtilizeNodeCmd.java:100)
> at
> org.apache.solr.cloud.api.collections.OverseerCollectionMessageHandler.processMessage(OverseerCollectionMessageHandler.java:259)
> at
> org.apache.solr.cloud.OverseerTaskProcessor$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)
>
> Not quite sure what it compares but the comparator should be this one:
> https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/MoveReplicaSuggester.java#L98
> Not sure if it's possible but if both replicas are leaders the result
> looks wrong to me.
>
> Anyhow, my main issue is that I don't see why Solr suddenly decided to
> move all replicas of my node.
>
> regards,
> Hendrik
