Unable to load the knime-executor?

Naveennk · February 13, 2024, 6:51am

WARN main RabbitMQHandler Couldn’t connect to message queue, retry to connect in 10000ms
java.net.ConnectException: Connection refused: no further information
at java.base/sun.nio.ch.Net.pollConnect(Native Method)
at java.base/sun.nio.ch.Net.pollConnectNow(Unknown Source)
at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(Unknown Source)
at java.base/sun.nio.ch.NioSocketImpl.connect(Unknown Source)
at java.base/java.net.SocksSocketImpl.connect(Unknown Source)
at java.base/java.net.Socket.connect(Unknown Source)
at com.rabbitmq.client.impl.SocketFrameHandlerFactory.create(SocketFrameHandlerFactory.java:61)
at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:69)
at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:165)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1242)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1198)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1020)
at com.knime.enterprise.executor.amqp.RabbitMQHandler.createConnection(RabbitMQHandler.java:146)
at com.knime.enterprise.executor.amqp.RabbitMQHandler.(RabbitMQHandler.java:107)
at com.knime.enterprise.executor.KNIMEExecutorApplication.start(KNIMEExecutorApplication.java:91)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:402)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
at org.eclipse.equinox.launcher.Main.run(Main.java:1467)
WARN main RabbitMQHandler Couldn’t connect to message queue, retry to connect in 10000ms
java.net.ConnectException: Connection refused: no further information
at java.base/sun.nio.ch.Net.pollConnect(Native Method)
at java.base/sun.nio.ch.Net.pollConnectNow(Unknown Source)
at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(Unknown Source)
at java.base/sun.nio.ch.NioSocketImpl.connect(Unknown Source)
at java.base/java.net.SocksSocketImpl.connect(Unknown Source)
at java.base/java.net.Socket.connect(Unknown Source)
at com.rabbitmq.client.impl.SocketFrameHandlerFactory.create(SocketFrameHandlerFactory.java:61)
at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:69)
at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:165)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1242)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1198)
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1020)
at com.knime.enterprise.executor.amqp.RabbitMQHandler.createConnection(RabbitMQHandler.java:146)
at com.knime.enterprise.executor.amqp.RabbitMQHandler.(RabbitMQHandler.java:107)
at com.knime.enterprise.executor.KNIMEExecutorApplication.start(KNIMEExecutorApplication.java:91)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:402)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
at org.eclipse.equinox.launcher.Main.run(Main.java:1467)

AlexanderFillbrunn · February 13, 2024, 8:23am

Hi @Naveennk,
This means that the executor cannot establish a connection to the server’s message queue, via which it receives its commands. This can either be because the server is not started, because the server is on a different machine and the network connection is blocked, or because the executor is not correctly configured. Depending on your setup, the message queue URL is either configured in the knime.ini or in the systemd override.conf that you can edit via sudo systemctl edit knime-executor.
Kind regards,
Alexander