storj/satellite/gc
Egon Elbre 62e3bf5b34 storagenode/retain: fix concurrency issues (#2828)
* nicer flags

* fix concurrency

* add concurrent workers

* initialize things

* fix tests

* close retain service

* ensure we don't have workers working on the same satellite

* ensure things compile

* fix other compilation issues:

* concurrency changes

ran this with `go test -count=1000` and it passed all of them.

- we add a closed channel so that we can select on it with
  context cancellation.
- we put a once in so we only close the channel once.
- every time the queue/running state changes, we have to broadcast
  because we may want to wake up N pending Wait calls or other
  concurrent workers.
- because we broadcast, we don't need to do the polling in Wait
  anymore.
- ensure Run doesn't start multiple times so that we don't have
  to worry about concurrent Close with multiple Runs.
- hold the lock while we start workers so that a concurrent Close
  with Run can't decide that there's nothing started and exit
  and then have Run start things.
- make sure to poll the closed/context channels through loops
  or at the start of Run calls in case Close happens first.
- these polls should be under a mutex because they have a default
  case which makes it possible to schedule such that Close hasn't
  executed the channel close so it starts more work.
- cancel a local Run context when it's going to exit to make sure
  that any retainPieces calls have a canceled context.
- hopefully enough comments to both check my work and help readers
  digest what's going on.

Change-Id: Ida0e226a7e01e8ae64fa2c59dd5a84b04bccfbd7

* use the retain error class

Change-Id: I1511eaef135f98afd57b878e997e4c8a0d11cafc

* concurrency fixes again

- forgot to update the gc test to use the old Wait api.
- we need to drop the lock while we wait for the workers
  to exit, because they may be blocked on the condition
  variable
- additionally, we need to broadcast when we close the
  signal channel because the state changed: they want
  to wake up and exit.

Change-Id: I4204699792275260cd912f29aa73720f7d9b14b5

* undo my misguided rename

Change-Id: I6baffe1eb0434e260212c485bbcc01bed3250881

* remove pollInterval

* format paragraph more nicely

* move skew calculation into retain pieces
2019-08-28 16:35:25 -04:00
..
doc.go Implement garbage collection on satellite (#2577) 2019-07-24 13:26:43 -04:00
gc_test.go storagenode/retain: fix concurrency issues (#2828) 2019-08-28 16:35:25 -04:00
piecetracker.go satellite/satellitedb: persist piece counts to/from db (#2803) 2019-08-27 14:37:42 +02:00
service.go satellite/gc: Service run must call mon.Task (#2887) 2019-08-27 20:20:27 +02:00