feyman2016 commented on a change in pull request #9270:
URL: https://github.com/apache/kafka/pull/9270#discussion_r499196092
##########
File path: core/src/main/scala/kafka/coordinator/group/GroupCoordinator.scala
##########
@@ -1040,21 +1040,36 @@ class GroupCoordinator(val brokerId: Int,
group.currentState match {
case Stable =>
- info(s"Static member joins during Stable stage will not trigger
rebalance.")
- group.maybeInvokeJoinCallback(member, JoinGroupResult(
- members = List.empty,
- memberId = newMemberId,
- generationId = group.generationId,
- protocolType = group.protocolType,
- protocolName = group.protocolName,
- // We want to avoid current leader performing trivial assignment
while the group
- // is in stable stage, because the new assignment in leader's next
sync call
- // won't be broadcast by a stable group. This could be guaranteed by
- // always returning the old leader id so that the current leader
won't assume itself
- // as a leader based on the returned message, since the new
member.id won't match
- // returned leader id, therefore no assignment will be performed.
- leaderId = currentLeader,
- error = Errors.NONE))
+ // check if group's selectedProtocol of next generation will change,
if not, simply store group to persist the
+ // updated static member, if yes, rebalance should be triggered to let
the group's assignment and selectProtocol consistent
+ val selectedProtocolOfNextGeneration = group.selectProtocol
+ if (group.protocolName.contains(selectedProtocolOfNextGeneration)) {
+ info(s"Static member which joins during Stable stage and doesn't
affect selectProtocol will not trigger rebalance.")
+ val groupAssignment: Map[String, Array[Byte]] =
group.allMemberMetadata.map(member => member.memberId ->
member.assignment).toMap
+ groupManager.storeGroup(group, groupAssignment, error => {
+ group.inLock {
+ if (error != Errors.NONE) {
Review comment:
Thanks for the review, @vvcephei . You're right for the current commit,
but as @abbccdda mentioned, the current commit does have issues, I'm revising
it to `reset` the `static member` in the group and return the error if
`storeGroup` encountered any errors. Code is ready, but met some local issues
when writing unittests, will update once it's ready.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
