poller ocuppy cpu 100%

[zjulyy]

I configurated spring integration in my web application as follows:

......
<pool-executor id="dispatcherPoolExecutor" core-size="5" max-size="10" queue-capacity="10" keep-alive-seconds="120" rejection-policy="DISCARD" />
<service-activator input-channel="orderChannel" ref="orderTarget" output-channel="cafeChannel">
    <poller period="1000" task-executor="dispatcherPoolExecutor" />
</service-activator>
......

I find the process "javaw" occupy cpu 100%. But when I commented out the poller subelement in service activator, cpu went well. Could you tell me what is the matter and what should I do to avoid this problem?

[zjulyy]

Additional remarks:
Whatever I ajusted the attributes of "pool-executor" and "poller" elements had no effect. The only approach was to comment out the "poller" subelement in "service-activator" element.

[Mark Fisher]

Try removing the "rejection-policy" element or you can explicitly specify the same value as the default: CALLER_RUNS

With CALLER_RUNS, the calling thread will run whenever a task is rejected due to no available threads. That effectively throttles the requests. Otherwise, by simply DISCARD-ing and continuing, it will thrash.

[zjulyy]

Cpu went normal when I removed "rejection-policy" as you suggested. But I wanted to discard some tasks when they were not responsed in time in my project, as the service responsed to requests maybe run in high load, and I wish this will not influence the requester's run. Then what should I do to realize it under the condition that DISCARD may occupy cpu 100%?