I thought it was a method (the method?) to know if a PG
comes back from a
crashed OSD/host, to know if it was up-to-date or old since it would have
an older timestamp.
Thanks. That's a reasonable theory. Maybe I'll look in the code and see if
I can confirm it.
And it means on my cluster, once an hour would probably be sufficient.
I was sure it was updated exactly once per second.
Because there's an infamous cluster log message every time the pgmap updates,
I know for me it is about 10 times a minute, in a pattern that is neither
periodic nor random. Maybe once per second is the maximum frequency and it
depends upon how frequently PGs are written to.
--
Bryan Henderson San Jose, California