After rollback() an active transaction is reported by mcsadmin shutdownSystem

On a node A, I build the basic_bulk_insert from mariadb-columnstore-api-columnstore-1.1.2 example. Node A has a file /usr/local/mariadb/columnstore/etc/Columnstore.xml from node B that runs MariaDB ColumnStore 1.1.2. The example successfully writes to the test.t1 table
(and the ColumnStore system reports no active transactions upon a shutdown).

I modifed the basic_bulk_insert.cpp by replacing the line
bulk->commit();
with
bulk->rollback();

After executing modified basic_bulk_insert, the MariaDB ColumnStore reports an active transaction upon a shutdown attempt:

mcsadmin shutdown y

shutdownsystem   Wed Dec 13 13:15:52 2017

This command stops the processing of applications on all Modules within the MariaDB ColumnStore System

   Checking for active transactions

   There are active transactions being processed

Your options are:

    Cancel    -- Cancel the shutdown request

    Wait      -- Wait for write operations to end and then shutdown

    Force     -- Force a shutdown

What would you like to do: [Cancel]:

There is no errors in /var/log/mariadb/columnstore/err.log. The output of the command

/usr/local/mariadb/columnstore/bin/dbrmctl status

OK.