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.
Description
Description
Previously, the environment setting via shell cannot be extracted correctly, due to the code is't ablle to
determine input parameter type.
Now the logic to determien parameter and give it different processing is added.
Resolves#4127
Testing
1. Pass an invalid env var:
FDB_NETWORK_OPTION_TRACE_ROLL_SIZE=xyz - error
FDB_NETWORK_OPTION_TRACE_ROLL_SIZE=123xyz) - error
2. Pass an out-of-ranged env var:
FDB_NETWORK_OPTION_TRACE_ROLL_SIZE=9999999999999999999999999999 -error
FDB_NETWORK_OPTION_TRACE_ROLL_SIZE=-9999999999999999999999999999 -error
3. Pass a valid env var
FDB_NETWORK_OPTION_TRACE_ROLL_SIZE=1000 -ok
4. Pass a float env var(not support)
FDB_NETWORK_OPTION_TRACE_ROLL_SIZE=3.1415926535 - error
Description
Previously, the environment setting via shell cannot be extracted correctly, due to the code is't ablle to
determine input parameter type.
Now the logic to determien parameter and give it different processing is added.
Testing
1. Rename monitorLeaderRemotely* functions to monitorLeaderWithDelayedCandidacy*. "Remote" is not clearly describing what the functions are doing;
2. Rename monitorLeaderForProxies() to monitorLeaderAndGetClientInfo() to better describe the function;
3. Remove monitorLeaderRemotelyInternal() and monitorLeaderRemotely() in MonitorLeader.actor.cpp, to eliminate code duplication. They already exist in worker.actor.cpp;
4. Move the declaration of getLeader() from LeaderElection.actor.cpp to MonitorLeader.h;
5. Update a few comments.
VersionVector::applyDelta(): Apply the delta version vector only if
the max version of the local version vector cache is below the max
version of the delta version vector.
sbodagala