Hi Markus, I don't know what Client you use, but if you are using SolrJ enabling the logging could be an option to "dig deeper" into the problem. This can be the ouput for example via log4j on log level info:
... 2017-08-31 10:01:56 INFO ZooKeeper:438 - Initiating client connection, connectString=ZKHOST1:9983,ZKHOST2:9983,ZKHOST3:9983,ZKHOST4:9983,ZKHOST5:9983 sessionTimeout=600000 watcher=org.apache.solr.common.cloud.SolrZkClient$3@14379273 2017-08-31 10:01:56 INFO ClientCnxn:876 - Socket connection established to SOLRHOST/ZKHOST3:9983, initiating session 2017-08-31 10:01:56 INFO ClientCnxn:1299 - Session establishment complete on server SOLRHOST/ZKHOST3:9983, sessionid = 0x45e35eaa9fd3584, negotiated timeout = 40000 2017-08-31 10:01:56 INFO ZkStateReader:688 - Updated live nodes from ZooKeeper... (0) -> (4) 2017-08-31 10:01:56 INFO ZkClientClusterStateProvider:134 - Cluster at ZKHOST1:9983,ZKHOST2:9983,ZKHOST3:9983,ZKHOST4:9983,ZKHOST5:9983 ready Von: Markus Jelsma <markus.jel...@openindex.io> An: solr-user@lucene.apache.org <solr-user@lucene.apache.org> Datum: 31.08.2017 10:00 Betreff: RE: Antwort: 6.6 Cannot talk to ZooKeeper - Updates are disabled. Hello Stephan, I know that restarting stuff can sometimes cure what's wrong, but we are nog going to, we want to get rid of the problem, not restart microsoft windows whenever things run slow. Also, there is no indexing going on right now. We also see these sometimes, this explains at least why it cannot talk to Zookeeper, but why.. o.a.s.c.RecoveryStrategy Socket timeout on send prep recovery cmd, retrying.. This has been going on with just one of our nodes for over two hours, other nodes are fine. And why is this bad node green in cluster overview? Thanks, Markus -----Original message----- > From:Stephan Schubert <stephan.schub...@sick.de> > Sent: Thursday 31st August 2017 9:52 > To: solr-user@lucene.apache.org > Subject: Antwort: 6.6 Cannot talk to ZooKeeper - Updates are disabled. > > Hi markus, > > try to stop your indexing/update processes and restart your ZooKeeper > instances (not all at the same time of course). This is what I do in these > cases and helped me so far. > > > > > Von: Markus Jelsma <markus.jel...@openindex.io> > An: Solr-user <solr-user@lucene.apache.org> > Datum: 31.08.2017 09:49 > Betreff: 6.6 Cannot talk to ZooKeeper - Updates are disabled. > > > > Hello, > > One node is behaving badly, at least according to the logs, but the node > is green in the cluster overview although the logs claim recovery fails > all the time. It is not the first time this message pops up in the logs of > one of the nodes, why can it not talk to Zookeeper? I miss a reason. > > The cluster is not extremely busy at the moment, we allow plenty of file > descriptors, there are no firewall restrictions, i cannot think of any > problem in our infrastructure. > > What's going on? What can i do? Can the error be explained a bit further? > > Thanks, > Markus > > 8/31/2017, 9:34:34 AM > ERROR false > RequestHandlerBase > org.apache.solr.common.SolrException: Cannot talk to ZooKeeper - Updates > are disabled. > 8/31/2017, 9:34:34 AM > ERROR false > RequestHandlerBase > org.apache.solr.common.SolrException: Cannot talk to ZooKeeper - Updates > are disabled. > 8/31/2017, 9:34:36 AM > ERROR false > RequestHandlerBase > org.apache.solr.common.SolrException: Cannot talk to ZooKeeper - Updates > are disabled. > 8/31/2017, 9:34:38 AM > ERROR false > RecoveryStrategy > Could not publish as ACTIVE after succesful recovery > 8/31/2017, 9:34:38 AM > ERROR true > RecoveryStrategy > Recovery failed - trying again... (0) > 8/31/2017, 9:34:49 AM > ERROR false > RequestHandlerBase > org.apache.solr.common.SolrException: Cannot talk to ZooKeeper - Updates > are disabled. > 8/31/2017, 9:34:49 AM > ERROR false > RequestHandlerBase > org.apache.solr.common.SolrException: Cannot talk to ZooKeeper - Updates > are disabled. > 8/31/2017, 9:34:50 AM > ERROR false > RecoveryStrategy > Could not publish as ACTIVE after succesful recovery > 8/31/2017, 9:34:50 AM > ERROR false > RecoveryStrategy > Recovery failed - trying again... (1) > 8/31/2017, 9:35:36 AM > ERROR false > RequestHandlerBase > org.apache.solr.common.SolrException: Cannot talk to ZooKeeper - Updates > are disabled. > > > >
