No, in different places, not just gravitation.

the first stack trace shows contention during a state transfer for the new 
buddy.  There is stuff being written to cache1 while cache1 is trying to get 
state to send to cache2.  And there is contention here.  Perhaps increasing 
your lock acquisition timeout for getting state for the buddy would help - 
according to the stack trace, it is set to 400millis!!

For the 2nd stack trace, the problem has to do with transactions and 2-phase 
commits which can happen when there are a lot of frequent writes to the same 
region.  Set your configuration to use synchronous commit and rollbacks and you 
won't see this.

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