Hi, Thank you! It helps XD
Best, tison. Tsz Wo Sze <[email protected]> 于2022年9月30日周五 18:37写道： > Hi tison, > > This is a good question. We recently added the following javadoc > (RATIS-1642) to clarify the thread safety requirements. > > // StateMachine.java > * A {@link StateMachine} implementation must be threadsafe. > * For example, the {@link #applyTransaction(TransactionContext)} method > and the {@link #query(Message)} method > * can be invoked in parallel. > > Tsz-Wo > > On Fri, Sep 30, 2022 at 6:21 PM tison <[email protected]> wrote: > >> Hi, >> >> I can imagine `applyTransaction' exclusive each other, and queries can >> safely concurrent. >> >> But I read some code snippets: >> >> synchronized (transactionFutures) >> >> ... in BaseStateMachine source code. This guides me to this question. >> >> Suppose I hold an in-memory map in the state machine, and update an >> intermediate state during applyTransaction. Of course, I don't want my >> users to see the intermediate state. Is it my responsibility to do lock >> guards? >> >> Best, >> tison. >> >
