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add Spawner.poll_jitter

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to avoid alignment of poll callbacks, e.g. after Hub restart
This commit is contained in:
Min RK
2023-11-30 09:43:35 +01:00
parent 73b2307b36
commit 11ea8f40d5
1 changed files with 17 additions and 1 deletions
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18
jupyterhub/spawner.py
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@@ -490,6 +490,20 @@ class Spawner(LoggingConfigurable):
""",
).tag(config=True)
poll_jitter = Float(
0.1,
min=0,
max=1,
help="""
Jitter fraction for poll_interval.
Avoids alignment of poll calls for many Spawners,
e.g. when restarting JupyterHub, which restarts all polls for running Spawners.
`poll_jitter=0` means no jitter, 0.1 means 10%, etc.
""",
).tag(config=True)
_callbacks = List()
_poll_callback = Any()
@@ -1405,7 +1419,9 @@ class Spawner(LoggingConfigurable):
self.stop_polling()
self._poll_callback = PeriodicCallback(
self.poll_and_notify, 1e3 * self.poll_interval
self.poll_and_notify,
1e3 * self.poll_interval,
jitter=self.poll_jitter,
)
self._poll_callback.start()