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Fig. 3.5 State diagram of a workflow execution
“
”
“
”
action can be called in both states, resulting in
delete
state, while a
resume
action can be invoked in
state only. Resuming a workflow effects its sub-
mission as a new workflow instance again, excluding the jobs executed correctly
earlier, so through a temporary
“
resuming
”
state the workflow will be in
“
running
”
state again. Nevertheless, users have the option to stop the execution any time when
the workflow is in
“
error
”
“
running
”
state by clicking the
“
suspend
”
button. This action
changes the state to
, in which the workflow can be deleted or resumed.
As is illustrated in Fig.
3.5
the workflow enactment and all of the possible
actions can be taken via the web-based user interface.
Additionally, users are allowed to suspend those jobs that are currently being
interpreted; hence the workflow instance can be recon
“
suspended
”
gured, and then the instance
can be resumed with its modi
ed con
guration. To let the users change the con-
files generated by job
instances can be downloaded and standard output and standard error outputs can be
visualized immediately after their execution.
figuration considering the former jobs
'
output, all
the
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