aoozdemir edited a comment on issue #156: ZOOKEEPER-2044:CancelledKeyException in zookeeper 3.4.5. URL: https://github.com/apache/zookeeper/pull/156#issuecomment-604373972 @maoling I'm guessing that it's not critical, but it's not ideal to have the error all the time. Below is the error log we get with the `zookeeper metricbeat module` enabled. We use the version 7.6 if that's related as well. I don't know what else you need, however, this is the image we use; ``` image: "k8s.gcr.io/kubernetes-zookeeper:1.0-3.4.10" ``` and the configuration for the start-zookeeper; ``` start-zookeeper \ --servers=3 \ --data_dir=/var/lib/zookeeper/data \ --data_log_dir=/var/lib/zookeeper/data/log \ --conf_dir=/opt/zookeeper/conf \ --client_port=2181 \ --election_port=3888 \ --server_port=2888 \ --tick_time=2000 \ --init_limit=10 \ --sync_limit=5 \ --heap=512M \ --max_client_cnxns=60 \ --snap_retain_count=3 \ --purge_interval=12 \ --max_session_timeout=40000 \ --min_session_timeout=4000 \ --log_level=INFO ``` --- ``` 2020-03-26T10:04:45.382Z 2020-03-26 10:04:45,382 [myid:3] - INFO [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@883] - Processing mntr command from /__IPADDRESSOMITTED__:58844 2020-03-26T10:04:45.382Z 2020-03-26 10:04:45,382 [myid:3] - INFO [Thread-48554:NIOServerCnxn@1044] - Closed socket connection for client /__IPADDRESSOMITTED__:58844 (no session established for client) 2020-03-26T10:04:45.386Z Exception in thread "Thread-48553" java.nio.channels.CancelledKeyException 2020-03-26T10:04:45.387Z at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73) 2020-03-26T10:04:45.387Z at org.apache.zookeeper.server.ServerCnxn.dumpConnectionInfo(ServerCnxn.java:500) 2020-03-26T10:04:45.387Z at org.apache.zookeeper.server.NIOServerCnxn.getInterestOps(NIOServerCnxn.java:1180) 2020-03-26T10:04:45.387Z at org.apache.zookeeper.server.NIOServerCnxn$CommandThread.run(NIOServerCnxn.java:515) 2020-03-26T10:04:45.387Z at sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:77) 2020-03-26T10:04:45.387Z at org.apache.zookeeper.server.NIOServerCnxn$ConsCommand.commandRun(NIOServerCnxn.java:715) ```
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