Wsrep:replicating and certifying write set(-1) - wsrep aborter idle - wsrep: committed TOI write set

Hi there
I have a 3 node cluster ,all the nodes are online 1,2 & 3 .
below is the result set when executed the SHOW PROCESSLIST; at node 2.

1.wsrep: committed TOI write set 
2.wsrep aborter idle
3.wsrep:replicating and certifying write set(-1)

how to proceed regarding above 3 scenarios ?
please refer to screenshot

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