we use Postgres-XC+pg10(4 coordinator + 4 datanode(pg 10 as datanode, and 1
master 1 standby for each datanode)), and benchmark tpcc, there is some
cross datanode transactions that use 2pc, during testing, we restart the
cluster, then one datanode standby can not recovery done and hangup with
TwoPhaseStateLock deadlock.
and sorry, we reinstall the cluster, and the log is removed, we will try to
reproduce, but anyway, the code is not right like Michael saied.
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