Apache Ignite: Possible too long JVM pause: 714 milliseconds
Is the GC happening in the Client(SpringBoot application) or Server node?
GC error will be logged to the log of the node which suffers problems.
What will be that impact of long GC pause?
Such pauses decreases overall performance. Also if pause will be longer than failureDetectionTimeout node will be disconnected from cluster.
What should I do to prevent the impact?
General advises are collected here - https://apacheignite.readme.io/docs/jvm-and-system-tuning. Also you can enable GC logs to have full picture of what happens.
Do I have to configure the JVM option in SpringBoot application as well?
Looks like that you should, because you have problems with client's node.