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https://issues.apache.org/jira/browse/SOLR-7940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032540#comment-15032540
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James Hardwick commented on SOLR-7940:
--------------------------------------
We are seeing this as well on a 3 node cluster w/ 2 collections.
Looks like others are also, across a variety of versions:
http://lucene.472066.n3.nabble.com/CLUSTERSTATUS-timeout-tp4173224.html
> [CollectionAPI] Frequent Cluster Status timeout
> -----------------------------------------------
>
> Key: SOLR-7940
> URL: https://issues.apache.org/jira/browse/SOLR-7940
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.10.2
> Environment: Ubuntu on Azure
> Reporter: Stephan Lagraulet
>
> Very often we have a timeout when we call
> http://server2:8080/solr/admin/collections?action=CLUSTERSTATUS&wt=json
> {code}
> {"responseHeader":
> {"status": 500,
> "QTime": 180100},
> "error":
> {"msg": "CLUSTERSTATUS the collection time out:180s",
> "trace": "org.apache.solr.common.SolrException: CLUSTERSTATUS the collection
> time out:180s\n\tat
> org.apache.solr.handler.admin.CollectionsHandler.handleResponse(CollectionsHandler.java:368)\n\tat
>
> org.apache.solr.handler.admin.CollectionsHandler.handleResponse(CollectionsHandler.java:320)\n\tat
>
> org.apache.solr.handler.admin.CollectionsHandler.handleClusterStatus(CollectionsHandler.java:640)\n\tat
>
> org.apache.solr.handler.admin.CollectionsHandler.handleRequestBody(CollectionsHandler.java:220)\n\tat
>
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)\n\tat
>
> org.apache.solr.servlet.SolrDispatchFilter.handleAdminRequest(SolrDispatchFilter.java:729)\n\tat
>
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:267)\n\tat
>
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)\n\tat
>
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)\n\tat
>
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:484)\n\tat
>
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)\n\tat
>
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)\n\tat
>
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233)\n\tat
>
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)\n\tat
>
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)\n\tat
>
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)\n\tat
>
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)\n\tat
>
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)\n\tat
>
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)\n\tat
>
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)\n\tat
>
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)\n\tat
> org.eclipse.jetty.server.Server.handle(Server.java:350)\n\tat
> org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)\n\tat
>
> org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)\n\tat
>
> org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)\n\tat
> org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:630)\n\tat
> org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)\n\tat
> org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)\n\tat
>
> org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:606)\n\tat
>
> org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:46)\n\tat
>
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603)\n\tat
>
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538)\n\tat
> java.lang.Thread.run(Thread.java:745)\n",
> "code": 500}}
> {code}
> The cluster has 3 SolR nodes with 6 small collections replicated on all nodes.
> We were using this api to monitor cluster state but it was failing every 10
> minutes. We switched by using ZkStateReader in CloudSolrServer and it has
> been working for a day without problems.
> Is there a kind of deadlock as this call was been made on the three nodes
> concurrently?
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