here is a screenshot example
[image: image.png]
f cad <[email protected]> 于2024年6月21日周五 11:45写道：
> Hello, community:
>
> I have a cluster ,with three nodes.
> I have two cache, that AtomicityMode is TRANSACTIONAL and Backups number is
> two and WriteSynchronizationMode is PRIMARY_SYNC
>
>
> I use IgniteClientSpringTransactionManagerwith OPTIMISTIC transaction and
> SERIALIZABLE concurrency mode.
>
> pseudocode like below
> ignite.transactions().txStart
> if(acahce.get(key)==null) {
> aCahce.put(key,value)
> bCahce.put(key,value)
> }
> tx.commit()
>
> Sometimes I find aCahce.get(key) costs 80ms ,Sometimes that costs only 5ms.
> and three ignite nodes usage of cpu and io and memory all not high.
> and client node usage of cpu and io and memory all not high.
> but I use tcpdump to find that Between nodes, there are over 40 TCP
> retransmissions per second.
> So is this a network issue?
>
>
