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Added support for FetchRequest protocol version 3. #905

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merged 3 commits into from
Jun 30, 2017
Merged

Added support for FetchRequest protocol version 3. #905

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4d1eceb
Added support for FetchRequest protocol version 3.
Jun 15, 2017
b69551c
Add support for FetchRequest API V3.
Jun 20, 2017
d6b6145
Changing if condition from C-style in response to PR feedback.
Jun 30, 2017
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4 changes: 4 additions & 0 deletions consumer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -726,6 +726,10 @@ func (bc *brokerConsumer) fetchNewMessages() (*FetchResponse, error) {
if bc.consumer.conf.Version.IsAtLeast(V0_10_0_0) {
request.Version = 2
}
if bc.consumer.conf.Version.IsAtLeast(V0_10_1_0) {
request.Version = 3
request.MaxBytes = MaxResponseSize - 47 // TODO(mherstin): WTF?!
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I agree with the comment: where did the value of 47 come from?

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That's embarrassing-- this was removed in a subsequent commit which I forgot to push. Fixed.

}

for child := range bc.subscriptions {
request.AddBlock(child.topic, child.partition, child.offset, child.fetchSize)
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12 changes: 12 additions & 0 deletions fetch_request.go
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Expand Up @@ -21,9 +21,13 @@ func (b *fetchRequestBlock) decode(pd packetDecoder) (err error) {
return nil
}

// FetchRequest (API key 1) will fetch Kafka messages. Version 3 introduced the MaxBytes field. See
// https://issues.apache.org/jira/browse/KAFKA-2063 for a discussion of the issues leading up to that. The KIP is at
// https://cwiki.apache.org/confluence/display/KAFKA/KIP-74%3A+Add+Fetch+Response+Size+Limit+in+Bytes
type FetchRequest struct {
MaxWaitTime int32
MinBytes int32
MaxBytes int32
Version int16
blocks map[string]map[int32]*fetchRequestBlock
}
Expand All @@ -32,6 +36,9 @@ func (r *FetchRequest) encode(pe packetEncoder) (err error) {
pe.putInt32(-1) // replica ID is always -1 for clients
pe.putInt32(r.MaxWaitTime)
pe.putInt32(r.MinBytes)
if 3 == r.Version {
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r.Version == 3 is more consistent with the rest of the code, and with the check you added below

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Old habits die hard; fixed in my latest commit.

pe.putInt32(r.MaxBytes)
}
err = pe.putArrayLength(len(r.blocks))
if err != nil {
return err
Expand Down Expand Up @@ -67,6 +74,11 @@ func (r *FetchRequest) decode(pd packetDecoder, version int16) (err error) {
if r.MinBytes, err = pd.getInt32(); err != nil {
return err
}
if r.Version == 3 {
if r.MaxBytes, err = pd.getInt32(); err != nil {
return err
}
}
topicCount, err := pd.getArrayLength()
if err != nil {
return err
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