func (self *NsqdCoordinator) updateChannelOffsetOnSlave(tc *coordData, channelName string, offset ChannelConsumerOffset) *CoordErr {
topicName := tc.topicInfo.Name
partition := tc.topicInfo.Partition
if !tc.IsMineISR(self.myNode.GetID()) {
return ErrTopicWriteOnNonISR
}
if coordLog.Level() >= levellogger.LOG_DETAIL {
coordLog.Debugf("got update channel(%v) offset on slave : %v", channelName, offset)
}
coord, coordErr := self.getTopicCoord(topicName, partition)
if coordErr != nil {
return ErrMissingTopicCoord
}
topic, localErr := self.localNsqd.GetExistingTopic(topicName, partition)
if localErr != nil {
coordLog.Warningf("slave missing topic : %v", topicName)
// TODO: leave the isr and try re-sync with leader
return &CoordErr{localErr.Error(), RpcCommonErr, CoordSlaveErr}
}
if topic.GetTopicPart() != partition {
coordLog.Errorf("topic on slave has different partition : %v vs %v", topic.GetTopicPart(), partition)
return ErrLocalMissingTopic
}
var ch *nsqd.Channel
ch, localErr = topic.GetExistingChannel(channelName)
// if a new channel on slave, we should set the consume offset by force
if localErr != nil {
offset.AllowBackward = true
ch = topic.GetChannel(channelName)
coordLog.Infof("slave init the channel : %v, %v, offset: %v", topic.GetTopicName(), channelName, ch.GetConfirmed())
}
if ch.IsEphemeral() {
coordLog.Errorf("ephemeral channel %v should not be synced on slave", channelName)
}
currentEnd := ch.GetChannelEnd()
if nsqd.BackendOffset(offset.VOffset) > currentEnd.Offset() {
coordLog.Debugf("update channel(%v) consume offset exceed end %v on slave : %v", channelName, offset, currentEnd)
// cache the offset (using map?) to reduce the slave channel flush.
coord.consumeMgr.Lock()
cur, ok := coord.consumeMgr.channelConsumeOffset[channelName]
if !ok || cur.VOffset < offset.VOffset {
coord.consumeMgr.channelConsumeOffset[channelName] = offset
}
coord.consumeMgr.Unlock()
if offset.Flush {
topic.ForceFlush()
currentEnd = ch.GetChannelEnd()
if nsqd.BackendOffset(offset.VOffset) > currentEnd.Offset() {
offset.VOffset = int64(currentEnd.Offset())
offset.VCnt = currentEnd.TotalMsgCnt()
}
} else {
return nil
}
}
err := ch.ConfirmBackendQueueOnSlave(nsqd.BackendOffset(offset.VOffset), offset.VCnt, offset.AllowBackward)
if err != nil {
coordLog.Warningf("update local channel(%v) offset %v failed: %v, current channel end: %v, topic end: %v",
channelName, offset, err, currentEnd, topic.TotalDataSize())
if err == nsqd.ErrExiting {
return &CoordErr{err.Error(), RpcNoErr, CoordTmpErr}
}
return &CoordErr{err.Error(), RpcCommonErr, CoordSlaveErr}
}
return nil
}