* Revert "Revert "Refactor: ClusterController driving cluster-recovery state machine""
Major changes includes:
1. Re-revert Sequencer refactor commits listed below (in listed order):
1.a. This reverts commit bb17e194d9.
1.b. This reverts commit d174bb2e06.
1.c. This reverts commit 30b05b469c.
2. Update Status.actor to track ClusterController interface to track
recovery status.
3. Introduce a ServerKnob to define "cluster recovery trace event"
prefix; for now keeping it as "Master", however, it should allow
smooth transition to "Cluster" prefix as it seems more appropriate.
* Redwood files now growth in large page chunks controlled by a knob to reduce truncate() calls for expansion. PriorityMultiLock has limit on consecutive same-priority lock release. Increased Redwood max priority level to 3 for more separation at higher BTree levels.
* Simulation fix, don't mark certain IO timeout errors as injected unless the simulated process has been set to have an unreliable disk.
* Pager writes now truncate gradually upward, one chunk at a time, in response to writes, which wait on only the necessary truncate operations. Increased buggified chunk size because truncate can be very slow in simulation.
* In simulation, ioTimeoutError() and ioDegradedOrTimeoutError() will wait until at least the target timeout interval past the point when simulation is sped up.
* PriorityMultiLock::toString() prints more info and is now public.
* Added queued time to PriorityMultiLock.
* Bug fix to handle when speedUpSimulation changes later than the configured time.
* Refactored mutation application in leaf nodes to do fewer comparisons and do in place value updates if the new value is the same size as the old value.
* Renamed updatingInPlace to updatingDeltaTree for clarity. Inlined switchToLinearMerge() since it is only used in one place.
* Updated extendToCover to be more clear by passing in the old extension future as a parameter. Fixed initialization warning.
In this PR, the blob manager now recruits blob workers
(via communication with the cluster controller). Blob workers
are onboarded as blob worker processes enter the cluster.
This commit refactors the logic for recruiting singletons,
which is done by the ClusterController. This allows for far
easier additions of new singletons in the future, and also
cleans up the code.
Also, the logic for recruiting DD was changed to mirror
the logic for recruiting RK. Although the logic for RK
allows there to be many RKs existing at once, the moveKeysLock
mechanism used by DD still prevents multiple DDs existing at once.
This commit refactors the logic for recruiting singletons,
which is done by the ClusterController. This allows for far
easier additions of new singletons in the future, and also
cleans up the code.
Also, the logic for recruiting DD was changed to mirror
the logic for recruiting RK. Although the logic for RK
allows there to be many RKs existing at once, the moveKeysLock
mechanism used by DD still prevents multiple DDs existing at once.
Josh Slocum