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  1. Jenkins
  2. JENKINS-73448

ResponseTimeMonitor sometimes records wrong values

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: Major Major
    • core
    • None

      The "Response Time" of a Nodes (i.e. ResponseTimeMonitor) sometimes displays a response time is incorrect and related to other node(s). In those case, several nodes - even if response time are very different - would show the same response time.

      Evidence

      One can create a LoggingChannelListener and attach it to the agent channels, for example:

      import hudson.remoting.Channel
import hudson.remoting.Command
import hudson.remoting.Request
import hudson.remoting.Response
import org.jenkinsci.remoting.util.LoggingChannelListener

import java.util.logging.Level
import java.util.logging.Logger

//new LoggingChannelListener(Logger.getLogger(Channel.Listener.class.getName()), Level.FINEST)

Channel.Listener myListener = new LoggingChannelListener(Logger.getLogger(Channel.Listener.class.getName()), Level.FINEST) {

  @Override
  void onClosed(Channel channel, IOException cause) {
    super.onClosed(channel, cause)
  }

  @Override
  void onRead(Channel channel, Command cmd, long blockSize) {
    super.onRead(channel, cmd, blockSize)
  }

  @Override
  void onWrite(Channel channel, Command cmd, long blockSize) {
    super.onWrite(channel, cmd, blockSize)
  }

  @Override
  void onResponse(Channel channel, Request<?, ?> req, Response<?, ?> rsp, long totalTime) {
    super.onResponse(channel, req, rsp, totalTime)
  }

  @Override
  void onJar(Channel channel, File jar) {
    super.onJar(channel, jar)
  }
}

((Channel)jenkins.model.Jenkins.get().getNode("seco-3902-local").getChannel()).addListener(myListener)
((Channel)jenkins.model.Jenkins.get().getNode("test-1").getChannel()).addListener(myListener)

      We can clearly see in the log recorded that the response of the "local" (closest) agent is a lot shorter than the agent that is distant. ~3ms vs ~230ms:

      FINEST	o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2325: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@640b41bb
FINEST	o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@1f058853
FINEST	o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 3ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@640b41bb
FINEST	o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 229ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@1f058853
FINEST	o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2333: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@715021e0
FINEST	o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c217595
FINEST	o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 3ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@715021e0
FINEST	o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 230ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c217595
FINEST	o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@7d1392ec
FINEST	o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@76d6906e
FINEST	o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 6ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@7d1392ec
FINEST	o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 230ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@76d6906e
FINEST	o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6f4c596e
FINEST	o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@316ada04
FINEST	o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 2ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6f4c596e
FINEST	o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 230ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@316ada04
FINEST	o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2340: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@bd55be0
FINEST	o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c941e28
FINEST	o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 2ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@bd55be0
FINEST	o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 231ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c941e28

      The Response Time monitor takes as long as the slowest agent:

      FINE	h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
FINE	h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
FINE	h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
FINE	h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
FINE	h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 232ms

      But the UI reports 231 for both agents which is wrong:

      How to Reproduce

      I was able to reproduce this several times but not always.. I connect agents that are connected in different networks. One really close to the controller and one that is located in a distant network. In my scenario, a remote Kubernetes cluster with a permanent agent located within that cluster. And an agent running in a different region and connecting via websocket through ingress.

      • Spin up a Controller (use the system property hudson.node_monitors.AbstractNodeMonitorDescriptor.periodMinutes=1 to run the monitor more frequently, otherwise by default it runs every hour)
      • Create a Permanent Agent that is very close to the controller (in my case, response time is 2/3ms)
      • Create a Permanent Agent that is in a distant network (in my case, a local agent)
      • Check the Nodes page Response Time

      This does not consistently reproduce the problem and I haven't identified the exact scenario. Trying to delete / recreate the agent sometimes reproduce it.. I believe this happens when the agent connect at almost the same time. So try to have the 2 agent connect at the same time (and have their first Response Time result produced within the same periodic sequence)..

        1. inconsistent-response-time.png
          inconsistent-response-time.png
          46 kB

          [JENKINS-73448] ResponseTimeMonitor sometimes records wrong values

          Allan BURDAJEWICZ created issue -
          Allan BURDAJEWICZ made changes -
          Attachment New: inconsistent-response-time.png [ 62980 ]
          Allan BURDAJEWICZ made changes -
          Description Original: The "Response Time" of a Nodes (i.e. {{ResponseTimeMonitor}}) sometimes displays a response time is incorrect and related to other node(s). In those case, several nodes - even if response time are very different - would show the same response time.

          ### Evidence

          One can create a {{LoggingChannelListener}} and attach it to the agent channels, for example:

          {code}
          import hudson.remoting.Channel
          import hudson.remoting.Command
          import hudson.remoting.Request
          import hudson.remoting.Response
          import org.jenkinsci.remoting.util.LoggingChannelListener

          import java.util.logging.Level
          import java.util.logging.Logger

          //new LoggingChannelListener(Logger.getLogger(Channel.Listener.class.getName()), Level.FINEST)

          Channel.Listener myListener = new LoggingChannelListener(Logger.getLogger(Channel.Listener.class.getName()), Level.FINEST) {

            @Override
            void onClosed(Channel channel, IOException cause) {
              super.onClosed(channel, cause)
            }

            @Override
            void onRead(Channel channel, Command cmd, long blockSize) {
              super.onRead(channel, cmd, blockSize)
            }

            @Override
            void onWrite(Channel channel, Command cmd, long blockSize) {
              super.onWrite(channel, cmd, blockSize)
            }

            @Override
            void onResponse(Channel channel, Request<?, ?> req, Response<?, ?> rsp, long totalTime) {
              super.onResponse(channel, req, rsp, totalTime)
            }

            @Override
            void onJar(Channel channel, File jar) {
              super.onJar(channel, jar)
            }
          }

          ((Channel)jenkins.model.Jenkins.get().getNode("seco-3902-local").getChannel()).addListener(myListener)
          ((Channel)jenkins.model.Jenkins.get().getNode("test-1").getChannel()).addListener(myListener)
          {code}

          We can clearly see in the log recorded that the response of the "local" (closest) agent is a lot shorter than the agent that is distant. *~3ms* vs *~230ms*:

          {code}
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2325: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@640b41bb
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@1f058853
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 3ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@640b41bb
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 229ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@1f058853
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2333: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@715021e0
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c217595
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 3ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@715021e0
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 230ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c217595
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@7d1392ec
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@76d6906e
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 6ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@7d1392ec
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 230ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@76d6906e
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6f4c596e
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@316ada04
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 2ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6f4c596e
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 230ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@316ada04
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2340: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@bd55be0
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c941e28
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 2ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@bd55be0
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 231ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c941e28
          {code}

          The Response Time monitor takes as long as the slowest agent:

          {code}
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 232ms
          {code}

          But the UI reports {{231}} for both agents which is wrong:

          //TODO

          ### How to Reproduce

          I was able to reproduce this several times but not always.. I connect agents that are connected in different networks. One really close to the controller and one that is located in a distant network. In my scenario, a remote Kubernetes cluster with a permanent agent located within that cluster. And an agent running in a different region and connecting via websocket through ingress.

          * Spin up a Controller (use the system property {{hudson.node_monitors.AbstractNodeMonitorDescriptor.periodMinutes=1}} to run the monitor more frequently, otherwise by default it runs every hour)
          * Create a Permanent Agent that is very close to the controller (in my case, response time is 2/3ms)
          * Create a Permanent Agent that is in a distant network (in my case, a local agent)
          * Check the Nodes page Response Time

          This does not consistently reproduce the problem and I haven't identified the exact scenario. Trying to delete / recreate the agent sometimes reproduce it.. I believe this happens when the agent connect at almost the same time. So try to have the 2 agent connect at the same time (and have their first Response Time result produced within the same periodic sequence)..           		New: The "Response Time" of a Nodes (i.e. {{ResponseTimeMonitor}}) sometimes displays a response time is incorrect and related to other node(s). In those case, several nodes - even if response time are very different - would show the same response time.

          h3. Evidence

          One can create a {{LoggingChannelListener}} and attach it to the agent channels, for example:

          {code}
          import hudson.remoting.Channel
          import hudson.remoting.Command
          import hudson.remoting.Request
          import hudson.remoting.Response
          import org.jenkinsci.remoting.util.LoggingChannelListener

          import java.util.logging.Level
          import java.util.logging.Logger

          //new LoggingChannelListener(Logger.getLogger(Channel.Listener.class.getName()), Level.FINEST)

          Channel.Listener myListener = new LoggingChannelListener(Logger.getLogger(Channel.Listener.class.getName()), Level.FINEST) {

            @Override
            void onClosed(Channel channel, IOException cause) {
              super.onClosed(channel, cause)
            }

            @Override
            void onRead(Channel channel, Command cmd, long blockSize) {
              super.onRead(channel, cmd, blockSize)
            }

            @Override
            void onWrite(Channel channel, Command cmd, long blockSize) {
              super.onWrite(channel, cmd, blockSize)
            }

            @Override
            void onResponse(Channel channel, Request<?, ?> req, Response<?, ?> rsp, long totalTime) {
              super.onResponse(channel, req, rsp, totalTime)
            }

            @Override
            void onJar(Channel channel, File jar) {
              super.onJar(channel, jar)
            }
          }

          ((Channel)jenkins.model.Jenkins.get().getNode("seco-3902-local").getChannel()).addListener(myListener)
          ((Channel)jenkins.model.Jenkins.get().getNode("test-1").getChannel()).addListener(myListener)
          {code}

          We can clearly see in the log recorded that the response of the "local" (closest) agent is a lot shorter than the agent that is distant. *~3ms* vs *~230ms*:

          {code}
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2325: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@640b41bb
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@1f058853
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 3ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@640b41bb
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 229ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@1f058853
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2333: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@715021e0
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c217595
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 3ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@715021e0
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 230ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c217595
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@7d1392ec
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@76d6906e
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 6ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@7d1392ec
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 230ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@76d6906e
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6f4c596e
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@316ada04
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 2ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6f4c596e
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 230ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@316ada04
          FINEST o.j.r.u.LoggingChannelListener#onWrite: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 wrote 2340: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@bd55be0
          FINEST o.j.r.u.LoggingChannelListener#onWrite: test-1 wrote 2341: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c941e28
          FINEST o.j.r.u.LoggingChannelListener#onResponse: JNLP4-connect connection from 123.123.123.123/123.123.123.123:49288 received response in 2ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@bd55be0
          FINEST o.j.r.u.LoggingChannelListener#onResponse: test-1 received response in 231ms: UserRequest:hudson.node_monitors.ResponseTimeMonitor$Step1@6c941e28
          {code}

          The Response Time monitor takes as long as the slowest agent:

          {code}
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 231ms
          FINE h.n.AbstractNodeMonitorDescriptor$Record#run: Node monitoring Response Time completed in 232ms
          {code}

          But the UI reports {{231}} for both agents which is wrong:

           !inconsistent-response-time.png|thumbnail!

          h3. How to Reproduce

          I was able to reproduce this several times but not always.. I connect agents that are connected in different networks. One really close to the controller and one that is located in a distant network. In my scenario, a remote Kubernetes cluster with a permanent agent located within that cluster. And an agent running in a different region and connecting via websocket through ingress.

          * Spin up a Controller (use the system property {{hudson.node_monitors.AbstractNodeMonitorDescriptor.periodMinutes=1}} to run the monitor more frequently, otherwise by default it runs every hour)
          * Create a Permanent Agent that is very close to the controller (in my case, response time is 2/3ms)
          * Create a Permanent Agent that is in a distant network (in my case, a local agent)
          * Check the Nodes page Response Time

          This does not consistently reproduce the problem and I haven't identified the exact scenario. Trying to delete / recreate the agent sometimes reproduce it.. I believe this happens when the agent connect at almost the same time. So try to have the 2 agent connect at the same time (and have their first Response Time result produced within the same periodic sequence)..
          Allan BURDAJEWICZ made changes -
          Summary Original: ResponseTimeMonitor record wrong values New: ResponseTimeMonitor sometimes records wrong values
          Allan BURDAJEWICZ made changes -
          Remote Link New: This issue links to "CloudBees Internal Issue (Web Link)" [ 30421 ]

            Unassigned Unassigned
            allan_burdajewicz Allan BURDAJEWICZ
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              Created:
              Updated: