Does etcd watch send all changes in etcd transaction in one response?

[AdiaLoveTrance]

When watch a prefix of keys in etcd, at the same time, put many same prefix keys in a etcd txn, can etcd guarantee that I can get all changes of prefix keys by one response? Or does etcd just batch numbers of key changes and send to client one by one batch?

[AdiaLoveTrance]

I found the answer in doc:
Watches make three guarantees about events:

Ordered - events are ordered by revision; an event will never appear on a watch if it precedes an event in time that has already been posted.
Reliable - a sequence of events will never drop any subsequence of events; if there are events ordered in time as a < b < c, then if the watch receives events a and c, it is guaranteed to receive b.
Atomic - a list of events is guaranteed to encompass complete revisions; updates in the same revision over multiple keys will not be split over several lists of events.

[serathius]

+/- if you enable fragment option in watch, then the response can be split into smaller chunks and you need to merge them yourself based on fragment field in responses.