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https://issues.apache.org/jira/browse/ROCKETMQ-98?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15867128#comment-15867128
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yukon commented on ROCKETMQ-98:
-------------------------------
Yes, it's a problem, and change the lock type is not expected.
> Risk of unable to release putMessage Lock forever
> -------------------------------------------------
>
> Key: ROCKETMQ-98
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-98
> Project: Apache RocketMQ
> Issue Type: Bug
> Reporter: Jaskey Lam
> Assignee: vongosling
>
> In current implemenation, there are two kind of locks dev can choose. If I
> choose reentrantLock, and lock it then put message, in this time I change the
> config through admin interface to use spin lock. When trying to unlock,
> rocketmq will try to unlock the spin lock though actually the reentrantlock
> is locked, this will cause the reentrantlock not able to release forever and
> trying to release the wrong spin lock but actully it is not locked!
> /**
> * Spin util acquired the lock.
> */
> private void lockForPutMessage() {
> if
> (this.defaultMessageStore.getMessageStoreConfig().isUseReentrantLockWhenPutMessage())
> {
> putMessageNormalLock.lock();
> } else {
> boolean flag;
> do {
> flag = this.putMessageSpinLock.compareAndSet(true, false);
> }
> while (!flag);
> }
> }
> private void releasePutMessageLock() {
> if
> (this.defaultMessageStore.getMessageStoreConfig().isUseReentrantLockWhenPutMessage())
> {
> putMessageNormalLock.unlock();
> } else {
> this.putMessageSpinLock.compareAndSet(false, true);
> }
> }
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