Checked on master aggregator failed because the 2PC transaction -Tracelog error

Hello all,
can someone let me know what is the below error means?

NFO: Prepared transaction with id XXXXXXXXXXXXXXX:3846 checked on master aggregator failed because the 2PC transaction has not yet committed or rolled back on the master aggregator

thanks in adv

We use a two-phase commit protocol to make sure ALTER TABLE operations are atomic. This error message means that the system was trying to commit such a DDL transaction but could not. It may retry an operation and ultimately commit. The message was an INFO message and not and ERROR, meaning it is not saying the transaction was rolled back.

thanks sir for your reply