I posted a comment on the JIRA and read through Jenkins source code for a
while, but did not find a way to do it.
I would have preferred a simple job that ran periodically and just adjusted
the number of executors on each slave, but I came up with an alternate
approach.
- Increased the number of executors on slaves to the max that will be
needed
- Created a new job 'hold_executor'
- Scheduled to launch periodically
- High priority via priority sorter plugin
- Limited concurrent threads with throttle concurrent plugin, so a
minimum number of executors are always available for real work
- Job runs a script to check for conditions
- If executor should be disabled, the job sleeps while holding the
executor slot for a time period then checks again
- If executor should be freed for real work, the job exits
Not as clean, but it meets my needs for now.
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