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SERVER-12293
initial sync of a capped collection can often fail if highly transientSERVER-13925
Allow replSetMaintenance on primary servers
Secondary that enters RECOVERY mode does not reset connections
rs.status() shell helper reports repllag
Run mutational fuzzer operations against sync source in initial sync fuzzer suites
Add failpoint to allow InitialSyncTest fixture to pause initial syncing node after cloning some documents
Expand initial sync fuzzer grammar to include all CRUD document shapes and index DDL ops
Consider having tailable readPreference "primary" queries killed on stepdown
Remove oplogApplicationEnforcesSteadyStateConstraints parameter and opCounters
Parse oplog entries only once in the oplog fetcher
priorPrimaryMemberId electionCandidateMetric should track most recent non-empty primary seen
Rollback should take global write lock while truncating oplogSERVER-44330
Investigate the behavior of concurrent replSetInitiate on different nodes
Unify oplog visibility timestamp updates
ShardingTest should run the stop procedure for all of its ReplSetTest shard instances in parallel
Optimize the way a transaction waits for the previous transaction's table update to be durable
Factor RaftMongo.tla with MongoReplReconfig.tla
Test that reads survive stepdowns more often with awaitable isMaster
Create table of variables and their before/after states for Rollback
setFeatureCompatibilityVersion 4.4 succeeds on 5.0 binVersion that has indexes with conflicting optionsSERVER-3088
Combine Replica Sets and Shards to a single system, using RAID5 style parity
Ability for a replica set node to only have a subset of the databases or collections?
Change names/ips of members
Master-Master replication
mongos should work with replica-set (without sharding)
Support for multiple hostnames and IPs in MongoDB replica sets for high availability
applyOps may not include _id in oplog entry
applyOps accepts invalid op types
Decouple the interfaces of the OpObserverRegistry, the generic OpObservers, and the ReplicationOpObserver
Allow Change streams in standalone servers
Add abortCause to slow transaction logging
Profiling transaction operations should always succeed
Use ReplOperation IDL to reject malformed operations in applyOps command
Don't wait for writeConcern when committing a read-only transaction with readConcern: 'local'
Feature that allows Renaming Replica Sets (sharded as well as un-sharded environments)
Use IDL to parse heartbeat response message.
Remove "h" field from oplog entry.
Drop pooled connections to nodes no longer in the replica set after a reconfig
Fassert that FCV is set at the end of initial sync
Recover to common point on rollback instead of stable timestamp
rollback does not correct sizeStorer data sizes
Add sharded rollback tests
Update appropriate callers of abortActiveTransaction to pass abort cause status
Catch exception from transaction operation and store error on Session
Add abortCause argument to abortActiveTransaction and save it on the session
Add abortCause counts to serverStatus output
Track abortCause counts in ServerTransactionsMetrics
Stable timestamp and _currentCommittedSnapshot are redundant
Stuck with cache full during rollback
Make the default readConcern level for transactions be speculative majority