When we run a job, we can see the running status of the job in the
'Running Job List' on the flink web ui. Normally, it will be in the state of
‘RUNNING’.
But when the job is just started, 'RUNNING' The status of the job does not
mean that the job is processing the data correctly, it may still be applying
for TM resources, which may last for several minutes in the case of a large
degree of parallelism (it may even be stuck due to not being able to apply for
resources).
So why not add new ones The state represents the state in which the job is
actually processing data.
