What is the difference between corePoolSize and maxPoolSize in the Spring ThreadPoolTaskExecutor

Question

I have to send out massEmails to all users of a website. I want to use a thread pool for each email that is sent out. Currently I have set the values to :

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Answer 1

You should consider to increase value of queueCapacity than consider to increase value of corePoolSize or maxPoolSize. Those two properties (*PoolSize) are number of pool to execute but each message would be considering in queueCapacity

If you have 10000 users to send so 1000 * 10 (maxPoolSize) = 10000 but if 1000 for each thread is heavy, we can consider to increase poolSize.