Why does a custom trigger JAR load but the class not get executed?

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chethanrao97_162932 asked · Jul 24 at 06:22 AM

Why does a custom trigger JAR load but the class not get executed?

I have created the custom trigger.jar and placed in the directory where Cassandra service can read the same, after performing the "nodetool realoadtriggers" it just prints "Loading new <path>/trigger.jar" in system.log, but it's not executing the java class in the jar.

Note: Also, I have created the trigger on the table which should trigger this custom trigger jar, but that is also not happening

The java class implements ITrigger overrides argument method. Any pointers for debugging the same will be helpful.

cassandra trigger

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Answer 1 · 2020-07-24T08:34:29Z

Erick Ramirez answered · Jul 24 at 08:34 AM

There really isn't anything helpful in your question that allows us to assist you. You need to provide actionable information such as:

details of your implementation
how you configured it
Cassandra version
sample code

for us to be able to provide any meaningful answer.

You need to provide the trigger definition, for example:

CREATE TRIGGER sometrigger ON sometable USING 'o.a.c.triggers.SomeTriggerClass'

You'll need to place the custom SomeTriggerClass.jar in the triggers/ sub-directory on every node in your cluster. The location depends on the type of Cassandra installation but again, you haven't provided any actionable details. Cheers!

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