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Allow daemons to "hibernate", reducing pool size to 0 for a time

Authored by epriestley on Feb 24 2017, 5:06 PM.



Ref T12298. This change is the libphutil changes to support hibernation. The next change makes the Trigger daemon hibernate.

We already support having daemons exit, waiting a little while, then restarting them. We do this when configuration changes, by sending the daemons a signal. They exit, then we restart them a few seconds later.

This allows daemons to send a message to the overseer saying "when I exit, wait X seconds to restart me". Then they can exit and hibernate for a while before the overseer restarts them normally.

Test Plan

See next change.

Diff Detail

rPHU libphutil
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.