Does a hidden member count toward and operate as part of a write_concern majority in MongoDB 2.6?
It states here that for the
w option, prior to Mongo 3.0,
"majority"refers to the majority of the replica set’s members.
It seems then that if I have four Mongo 2.6 nodes and one is hidden, then
"majority" calculates as
w=3, since the hidden node is still a replica-set member. Meanwhile, it's unclear to me whether writing to the hidden member counts toward fulfilling the write concern -- after all, only three nodes are visible for reads.
The concern I have is that with the above example, if one non-hidden node goes down, it becomes impossible to fulfill a write with