org.apache.zookeeper.KeeperException$NoWatcherException: KeeperErrorCode = No such watcher for /test

Apache's JIRA Issue Tracker | Rakesh Kumar Singh | 6 months ago
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    When zookeeper started in SSL mode, set a "get" watcher on a znode from zkCli client, restart the zkCli, the "Data" watcher still present. Trying removing that watcher fails saying no watcher available Steps to reproduce:- Start Zookeeper server in ssl mode by configuring all required ssl configuration Start zkCli and set a "Data" watcher "get -w " Restart the zkCli client Check the watcher. Still the Data watcher is available Try to remove the watcher using removewachers, it fails saying no watcher available. BLR1000007042:~ # echo wchs | netcat localhost 3181 1 connections watching 1 paths Total watches:1 BLR1000007042:~ # echo wchs | netcat localhost 3181 1 connections watching 1 paths Total watches:1 Client log as below:- [zk: localhost:2181(CONNECTED) 0] get -w /test hello1 [zk: localhost:2181(CONNECTED) 1] quit 2016-08-25 14:22:00,706 [myid:] - INFO [main:ClientCnxnSocketNetty@201] - channel is told closing 2016-08-25 14:22:00,706 [myid:] - INFO [main:ZooKeeper@1110] - Session: 0x1019f8940e20000 closed 2016-08-25 14:22:00,706 [myid:] - INFO [main-EventThread:ClientCnxn$EventThread@542] - EventThread shut down for session: 0x1019f8940e20000 2016-08-25 14:22:00,707 [myid:] - INFO [New I/O worker #1:ClientCnxnSocketNetty$ZKClientHandler@377] - channel is disconnected: [id: 0x9dab735e, /127.0.0.1:57415 :> localhost/127.0.0.1:2181] 2016-08-25 14:22:00,707 [myid:] - INFO [New I/O worker #1:ClientCnxnSocketNetty@201] - channel is told closing BLR1000007042:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin # ./zkCli.sh /usr/bin/java Connecting to localhost:2181 2016-08-25 14:22:15,079 [myid:] - INFO [main:Environment@109] - Client environment:zookeeper.version=3.5.1-alpha--1, built on 08/18/2016 08:20 GMT 2016-08-25 14:22:15,083 [myid:] - INFO [main:Environment@109] - Client environment:host.name=BLR1000007042 2016-08-25 14:22:15,084 [myid:] - INFO [main:Environment@109] - Client environment:java.version=1.7.0_79 2016-08-25 14:22:15,086 [myid:] - INFO [main:Environment@109] - Client environment:java.vendor=Oracle Corporation 2016-08-25 14:22:15,086 [myid:] - INFO [main:Environment@109] - Client environment:java.home=/usr/java/jdk1.7.0_79/jre 2016-08-25 14:22:15,086 [myid:] - INFO [main:Environment@109] - Client environment:java.class.path=/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../build/classes:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../build/lib/*.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/slf4j-log4j12-1.7.5.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/slf4j-api-1.7.5.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/servlet-api-2.5-20081211.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/netty-3.7.0.Final.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/log4j-1.2.16.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/jline-2.11.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/jetty-util-6.1.26.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/jetty-6.1.26.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/javacc.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/jackson-mapper-asl-1.9.11.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/jackson-core-asl-1.9.11.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/commons-cli-1.2.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../lib/ant-eclipse-1.0-jvm1.2.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../zookeeper-3.5.1-alpha.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../src/java/lib/ant-eclipse-1.0-jvm1.2.jar:/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin/../conf: 2016-08-25 14:22:15,087 [myid:] - INFO [main:Environment@109] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib 2016-08-25 14:22:15,087 [myid:] - INFO [main:Environment@109] - Client environment:java.io.tmpdir=/tmp 2016-08-25 14:22:15,087 [myid:] - INFO [main:Environment@109] - Client environment:java.compiler= 2016-08-25 14:22:15,087 [myid:] - INFO [main:Environment@109] - Client environment:os.name=Linux 2016-08-25 14:22:15,087 [myid:] - INFO [main:Environment@109] - Client environment:os.arch=amd64 2016-08-25 14:22:15,087 [myid:] - INFO [main:Environment@109] - Client environment:os.version=3.0.76-0.11-default 2016-08-25 14:22:15,087 [myid:] - INFO [main:Environment@109] - Client environment:user.name=root 2016-08-25 14:22:15,087 [myid:] - INFO [main:Environment@109] - Client environment:user.home=/root 2016-08-25 14:22:15,088 [myid:] - INFO [main:Environment@109] - Client environment:user.dir=/home/Rakesh/Zookeeper/18_Aug/zookeeper-3.5.1-alpha/bin 2016-08-25 14:22:15,088 [myid:] - INFO [main:Environment@109] - Client environment:os.memory.free=52MB 2016-08-25 14:22:15,090 [myid:] - INFO [main:Environment@109] - Client environment:os.memory.max=227MB 2016-08-25 14:22:15,090 [myid:] - INFO [main:Environment@109] - Client environment:os.memory.total=57MB 2016-08-25 14:22:15,095 [myid:] - INFO [main:ZooKeeper@716] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@272f15b0 Welcome to ZooKeeper! 2016-08-25 14:22:15,182 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1138] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error) JLine support is enabled [INFO] Unable to bind key for unsupported operation: backward-delete-word [INFO] Unable to bind key for unsupported operation: backward-delete-word [INFO] Unable to bind key for unsupported operation: down-history [INFO] Unable to bind key for unsupported operation: up-history [INFO] Unable to bind key for unsupported operation: up-history [INFO] Unable to bind key for unsupported operation: down-history [INFO] Unable to bind key for unsupported operation: up-history [INFO] Unable to bind key for unsupported operation: down-history [INFO] Unable to bind key for unsupported operation: up-history [INFO] Unable to bind key for unsupported operation: down-history [INFO] Unable to bind key for unsupported operation: up-history [INFO] Unable to bind key for unsupported operation: down-history [zk: localhost:2181(CONNECTING) 0] 2016-08-25 14:22:15,502 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxnSocketNetty$ZKClientPipelineFactory@363] - SSL handler added for channel: null 2016-08-25 14:22:15,537 [myid:] - INFO [New I/O worker #1:ClientCnxn$SendThread@980] - Socket connection established, initiating session, client: /127.0.0.1:57420, server: localhost/127.0.0.1:2181 2016-08-25 14:22:15,540 [myid:] - INFO [New I/O worker #1:ClientCnxnSocketNetty$1@146] - channel is connected: [id: 0xfc4fe483, /127.0.0.1:57420 => localhost/127.0.0.1:2181] 2016-08-25 14:22:15,673 [myid:] - INFO [New I/O worker #1:ClientCnxn$SendThread@1400] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x1019f8940e20001, negotiated timeout = 30000 WATCHER:: WatchedEvent state:SyncConnected type:None path:null [zk: localhost:2181(CONNECTED) 0] removewatches /test -a 2016-08-25 14:24:14,420 [myid:] - ERROR [New I/O worker #1:ClientCnxn@725] - Failed to find watcher! org.apache.zookeeper.KeeperException$NoWatcherException: KeeperErrorCode = No such watcher for /test at org.apache.zookeeper.ZooKeeper$ZKWatchManager.containsWatcher(ZooKeeper.java:377) at org.apache.zookeeper.ZooKeeper$ZKWatchManager.removeWatcher(ZooKeeper.java:252) at org.apache.zookeeper.WatchDeregistration.unregister(WatchDeregistration.java:58) at org.apache.zookeeper.ClientCnxn.finishPacket(ClientCnxn.java:712) at org.apache.zookeeper.ClientCnxn.access$1500(ClientCnxn.java:97) at org.apache.zookeeper.ClientCnxn$SendThread.readResponse(ClientCnxn.java:948) at org.apache.zookeeper.ClientCnxnSocketNetty$ZKClientHandler.messageReceived(ClientCnxnSocketNetty.java:419) at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296) at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462) at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443) at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303) at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559) at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268) at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255) at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88) at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:109) at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312) at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90) at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178) at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) KeeperErrorCode = No such watcher for /test [zk: localhost:2181(CONNECTED) 1]

    Apache's JIRA Issue Tracker | 6 months ago | Rakesh Kumar Singh
    org.apache.zookeeper.KeeperException$NoWatcherException: KeeperErrorCode = No such watcher for /test

    Root Cause Analysis

    1. org.apache.zookeeper.KeeperException$NoWatcherException

      KeeperErrorCode = No such watcher for /test

      at org.apache.zookeeper.ZooKeeper$ZKWatchManager.containsWatcher()
    2. Zookeeper
      ClientCnxnSocketNetty$ZKClientHandler.messageReceived
      1. org.apache.zookeeper.ZooKeeper$ZKWatchManager.containsWatcher(ZooKeeper.java:377)
      2. org.apache.zookeeper.ZooKeeper$ZKWatchManager.removeWatcher(ZooKeeper.java:252)
      3. org.apache.zookeeper.WatchDeregistration.unregister(WatchDeregistration.java:58)
      4. org.apache.zookeeper.ClientCnxn.finishPacket(ClientCnxn.java:712)
      5. org.apache.zookeeper.ClientCnxn.access$1500(ClientCnxn.java:97)
      6. org.apache.zookeeper.ClientCnxn$SendThread.readResponse(ClientCnxn.java:948)
      7. org.apache.zookeeper.ClientCnxnSocketNetty$ZKClientHandler.messageReceived(ClientCnxnSocketNetty.java:419)
      7 frames
    3. Netty
      DeadLockProofWorker$1.run
      1. org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
      2. org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
      3. org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
      4. org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
      5. org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)
      6. org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)
      7. org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)
      8. org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
      9. org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
      10. org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
      11. org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
      12. org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
      13. org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
      14. org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:109)
      15. org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
      16. org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90)
      17. org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
      18. org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
      19. org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
      19 frames
    4. Java RT
      Thread.run
      1. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
      3. java.lang.Thread.run(Thread.java:745)
      3 frames