This commits disallow multi-statement transactions on shard servers that have writeConcernMajorityJournalDefault = false.
Nodes running with the in-memory storage engine do not support transaction prepare and because of this, currently they cannot participate in cross-shard transactions.
On the chance that we start supporting that and in order to ensure that in-memory nodes and nodes running with writeConcernMajorityJournalDefault = false don't count towards the majority quorum for any w:majority writes done by the coordinator and participant, such writes should be done with j:true.
- txn prod concern
- txn sharded clusters prod concern
- rs conf page
- For now, will not put in the limits/restriction page for sharded clusters operation.