A trigger may execute many trigger operations, eg. a
foreign-key-parent may perform operations on matching child table
rows. A base table row operation may execute many triggers and it is
usual that the row operations are executed in batches. Trigger
execution can be immediate or deferred where deferred executes all
triggers at pre-commit. Executing high number of trigger operation
concurrently may overload the node resources, causing job buffer full
or send buffer full and leading to node crashes.

This is fixed by limiting the number of concurrently executing trigger
operations and outstanding fire-trigger requests per transaction.