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consumer_test.go
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consumer_test.go
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package cluster
import (
"fmt"
"regexp"
"sync/atomic"
"time"
"github.com/Shopify/sarama"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Consumer", func() {
var newConsumerOf = func(group string, topics ...string) (*Consumer, error) {
config := NewConfig()
config.Consumer.Return.Errors = true
config.Consumer.Offsets.Initial = sarama.OffsetOldest
return NewConsumer(testKafkaAddrs, group, topics, config)
}
var subscriptionsOf = func(c *Consumer) GomegaAsyncAssertion {
return Eventually(func() map[string][]int32 {
return c.Subscriptions()
}, "10s", "100ms")
}
It("should init and share", func() {
// start CS1
cs1, err := newConsumerOf(testGroup, testTopics...)
Expect(err).NotTo(HaveOccurred())
// CS1 should consume all 8 partitions
subscriptionsOf(cs1).Should(Equal(map[string][]int32{
"topic-a": {0, 1, 2, 3},
"topic-b": {0, 1, 2, 3},
}))
// start CS2
cs2, err := newConsumerOf(testGroup, testTopics...)
Expect(err).NotTo(HaveOccurred())
defer cs2.Close()
// CS1 and CS2 should consume 4 partitions each
subscriptionsOf(cs1).Should(HaveLen(2))
subscriptionsOf(cs1).Should(HaveKeyWithValue("topic-a", HaveLen(2)))
subscriptionsOf(cs1).Should(HaveKeyWithValue("topic-b", HaveLen(2)))
subscriptionsOf(cs2).Should(HaveLen(2))
subscriptionsOf(cs2).Should(HaveKeyWithValue("topic-a", HaveLen(2)))
subscriptionsOf(cs2).Should(HaveKeyWithValue("topic-b", HaveLen(2)))
// shutdown CS1, now CS2 should consume all 8 partitions
Expect(cs1.Close()).NotTo(HaveOccurred())
subscriptionsOf(cs2).Should(Equal(map[string][]int32{
"topic-a": {0, 1, 2, 3},
"topic-b": {0, 1, 2, 3},
}))
})
It("should allow more consumers than partitions", func() {
cs1, err := newConsumerOf(testGroup, "topic-a")
Expect(err).NotTo(HaveOccurred())
defer cs1.Close()
cs2, err := newConsumerOf(testGroup, "topic-a")
Expect(err).NotTo(HaveOccurred())
defer cs2.Close()
cs3, err := newConsumerOf(testGroup, "topic-a")
Expect(err).NotTo(HaveOccurred())
defer cs3.Close()
cs4, err := newConsumerOf(testGroup, "topic-a")
Expect(err).NotTo(HaveOccurred())
// start 4 consumers, one for each partition
subscriptionsOf(cs1).Should(HaveKeyWithValue("topic-a", HaveLen(1)))
subscriptionsOf(cs2).Should(HaveKeyWithValue("topic-a", HaveLen(1)))
subscriptionsOf(cs3).Should(HaveKeyWithValue("topic-a", HaveLen(1)))
subscriptionsOf(cs4).Should(HaveKeyWithValue("topic-a", HaveLen(1)))
// add a 5th consumer
cs5, err := newConsumerOf(testGroup, "topic-a")
Expect(err).NotTo(HaveOccurred())
defer cs5.Close()
// make sure no errors occurred
Expect(cs1.Errors()).ShouldNot(Receive())
Expect(cs2.Errors()).ShouldNot(Receive())
Expect(cs3.Errors()).ShouldNot(Receive())
Expect(cs4.Errors()).ShouldNot(Receive())
Expect(cs5.Errors()).ShouldNot(Receive())
// close 4th, make sure the 5th takes over
Expect(cs4.Close()).To(Succeed())
subscriptionsOf(cs1).Should(HaveKeyWithValue("topic-a", HaveLen(1)))
subscriptionsOf(cs2).Should(HaveKeyWithValue("topic-a", HaveLen(1)))
subscriptionsOf(cs3).Should(HaveKeyWithValue("topic-a", HaveLen(1)))
subscriptionsOf(cs4).Should(BeEmpty())
subscriptionsOf(cs5).Should(HaveKeyWithValue("topic-a", HaveLen(1)))
// there should still be no errors
Expect(cs1.Errors()).ShouldNot(Receive())
Expect(cs2.Errors()).ShouldNot(Receive())
Expect(cs3.Errors()).ShouldNot(Receive())
Expect(cs4.Errors()).ShouldNot(Receive())
Expect(cs5.Errors()).ShouldNot(Receive())
})
It("should be allowed to subscribe to partitions via white/black-lists", func() {
config := NewConfig()
config.Consumer.Return.Errors = true
config.Group.Topics.Whitelist = regexp.MustCompile(`topic-\w+`)
config.Group.Topics.Blacklist = regexp.MustCompile(`[bcd]$`)
cs, err := NewConsumer(testKafkaAddrs, testGroup, nil, config)
Expect(err).NotTo(HaveOccurred())
defer cs.Close()
subscriptionsOf(cs).Should(Equal(map[string][]int32{
"topic-a": {0, 1, 2, 3},
}))
})
It("should receive rebalance notifications", func() {
config := NewConfig()
config.Consumer.Return.Errors = true
config.Group.Return.Notifications = true
cs, err := NewConsumer(testKafkaAddrs, testGroup, testTopics, config)
Expect(err).NotTo(HaveOccurred())
defer cs.Close()
select {
case n := <-cs.Notifications():
Expect(n).To(Equal(&Notification{
Type: RebalanceStart,
Current: map[string][]int32{},
}))
case err := <-cs.Errors():
Expect(err).NotTo(HaveOccurred())
case <-cs.Messages():
Fail("expected notification to arrive before message")
}
select {
case n := <-cs.Notifications():
Expect(n).To(Equal(&Notification{
Type: RebalanceOK,
Claimed: map[string][]int32{
"topic-a": {0, 1, 2, 3},
"topic-b": {0, 1, 2, 3},
},
Released: map[string][]int32{},
Current: map[string][]int32{
"topic-a": {0, 1, 2, 3},
"topic-b": {0, 1, 2, 3},
},
}))
case err := <-cs.Errors():
Expect(err).NotTo(HaveOccurred())
case <-cs.Messages():
Fail("expected notification to arrive before message")
}
})
It("should support manual mark/commit", func() {
cs, err := newConsumerOf(testGroup, "topic-a")
Expect(err).NotTo(HaveOccurred())
defer cs.Close()
subscriptionsOf(cs).Should(Equal(map[string][]int32{
"topic-a": {0, 1, 2, 3}},
))
cs.MarkPartitionOffset("topic-a", 1, 3, "")
cs.MarkPartitionOffset("topic-a", 2, 4, "")
Expect(cs.CommitOffsets()).NotTo(HaveOccurred())
offsets, err := cs.fetchOffsets(cs.Subscriptions())
Expect(err).NotTo(HaveOccurred())
Expect(offsets).To(Equal(map[string]map[int32]offsetInfo{
"topic-a": {0: {Offset: -1}, 1: {Offset: 4}, 2: {Offset: 5}, 3: {Offset: -1}},
}))
})
It("should support manual mark/commit, reset/commit", func() {
cs, err := newConsumerOf(testGroup, "topic-a")
Expect(err).NotTo(HaveOccurred())
defer cs.Close()
subscriptionsOf(cs).Should(Equal(map[string][]int32{
"topic-a": {0, 1, 2, 3}},
))
cs.MarkPartitionOffset("topic-a", 1, 3, "")
cs.MarkPartitionOffset("topic-a", 2, 4, "")
cs.MarkPartitionOffset("topic-b", 1, 2, "") // should not throw NPE
Expect(cs.CommitOffsets()).NotTo(HaveOccurred())
cs.ResetPartitionOffset("topic-a", 1, 2, "")
cs.ResetPartitionOffset("topic-a", 2, 3, "")
cs.ResetPartitionOffset("topic-b", 1, 2, "") // should not throw NPE
Expect(cs.CommitOffsets()).NotTo(HaveOccurred())
offsets, err := cs.fetchOffsets(cs.Subscriptions())
Expect(err).NotTo(HaveOccurred())
Expect(offsets).To(Equal(map[string]map[int32]offsetInfo{
"topic-a": {0: {Offset: -1}, 1: {Offset: 3}, 2: {Offset: 4}, 3: {Offset: -1}},
}))
})
It("should not commit unprocessed offsets", func() {
const groupID = "panicking"
cs, err := newConsumerOf(groupID, "topic-a")
Expect(err).NotTo(HaveOccurred())
subscriptionsOf(cs).Should(Equal(map[string][]int32{
"topic-a": {0, 1, 2, 3},
}))
n := 0
Expect(func() {
for range cs.Messages() {
n++
panic("stop here!")
}
}).To(Panic())
Expect(cs.Close()).To(Succeed())
Expect(n).To(Equal(1))
bk, err := testClient.Coordinator(groupID)
Expect(err).NotTo(HaveOccurred())
req := &sarama.OffsetFetchRequest{
Version: 1,
ConsumerGroup: groupID,
}
req.AddPartition("topic-a", 0)
req.AddPartition("topic-a", 1)
req.AddPartition("topic-a", 2)
req.AddPartition("topic-a", 3)
Expect(bk.FetchOffset(req)).To(Equal(&sarama.OffsetFetchResponse{
Blocks: map[string]map[int32]*sarama.OffsetFetchResponseBlock{
"topic-a": {0: {Offset: -1}, 1: {Offset: -1}, 2: {Offset: -1}, 3: {Offset: -1}},
},
}))
})
It("should consume partitions", func() {
count := int32(0)
consume := func(consumerID string) {
defer GinkgoRecover()
config := NewConfig()
config.Group.Mode = ConsumerModePartitions
config.Consumer.Offsets.Initial = sarama.OffsetOldest
cs, err := NewConsumer(testKafkaAddrs, "partitions", testTopics, config)
Expect(err).NotTo(HaveOccurred())
defer cs.Close()
for pc := range cs.Partitions() {
go func(pc PartitionConsumer) {
defer pc.Close()
for msg := range pc.Messages() {
atomic.AddInt32(&count, 1)
cs.MarkOffset(msg, "")
}
}(pc)
}
}
go consume("A")
go consume("B")
go consume("C")
Eventually(func() int32 {
return atomic.LoadInt32(&count)
}, "30s", "100ms").Should(BeNumerically(">=", 2000))
})
It("should not lock on rebalance while dying", func() {
count := int32(0)
consume := func(consumerID string, closeChan, doneCh chan none) {
defer GinkgoRecover()
config := NewConfig()
config.Group.Mode = ConsumerModePartitions
config.Consumer.Offsets.Initial = sarama.OffsetOldest
config.Group.Offsets.Synchronization.DwellTime = time.Millisecond * 10000
cs, err := NewConsumer(testKafkaAddrs, "partitions-no-lock", testTopics, config)
Expect(err).NotTo(HaveOccurred())
defer func() {
cs.Close()
close(doneCh)
}()
for {
select {
case pc := <-cs.Partitions():
go func(pc PartitionConsumer) {
defer func() {
pc.Close()
}()
for {
select {
case msg, ok := <-pc.Messages():
if !ok {
return
}
atomic.AddInt32(&count, 1)
cs.MarkOffset(msg, "")
cs.CommitOffsets()
case <-closeChan:
return
}
}
}(pc)
case <-closeChan:
return
}
}
}
chanA := make(chan none)
chanADone := make(chan none)
go consume("A", chanA, chanADone)
chanB := make(chan none)
chanBDone := make(chan none)
go consume("B", chanB, chanBDone)
Eventually(func() int32 {
return atomic.LoadInt32(&count)
}, "30s", "100ms").Should(BeNumerically(">=", 100))
close(chanA)
time.Sleep(time.Millisecond * 5000)
close(chanB)
Eventually(func() chan none {
return chanADone
}, "30s", "100ms").Should(BeClosed())
Eventually(func() chan none {
return chanBDone
}, "30s", "100ms").Should(BeClosed())
})
It("should consume/commit/resume", func() {
acc := make(chan *testConsumerMessage, 20000)
consume := func(consumerID string, max int32) {
defer GinkgoRecover()
cs, err := NewConsumer(testKafkaAddrs, "fuzzing", testTopics, nil)
Expect(err).NotTo(HaveOccurred())
defer cs.Close()
cs.consumerID = consumerID
for msg := range cs.Messages() {
acc <- &testConsumerMessage{*msg, consumerID}
cs.MarkOffset(msg, "")
if atomic.AddInt32(&max, -1) <= 0 {
return
}
}
}
go consume("A", 1500)
go consume("B", 2000)
go consume("C", 1500)
go consume("D", 200)
go consume("E", 100)
time.Sleep(10 * time.Second) // wait for consumers to subscribe to topics
Expect(testSeed(5000, testTopics)).NotTo(HaveOccurred())
Eventually(func() int { return len(acc) }, "30s", "100ms").Should(BeNumerically(">=", 5000))
go consume("F", 300)
go consume("G", 400)
go consume("H", 1000)
go consume("I", 2000)
Expect(testSeed(5000, testTopics)).NotTo(HaveOccurred())
Eventually(func() int { return len(acc) }, "30s", "100ms").Should(BeNumerically(">=", 8000))
go consume("J", 1000)
Expect(testSeed(5000, testTopics)).NotTo(HaveOccurred())
Eventually(func() int { return len(acc) }, "30s", "100ms").Should(BeNumerically(">=", 9000))
go consume("K", 1000)
go consume("L", 3000)
Expect(testSeed(5000, testTopics)).NotTo(HaveOccurred())
Eventually(func() int { return len(acc) }, "30s", "100ms").Should(BeNumerically(">=", 12000))
go consume("M", 1000)
Expect(testSeed(5000, testTopics)).NotTo(HaveOccurred())
Eventually(func() int { return len(acc) }, "30s", "100ms").Should(BeNumerically(">=", 15000))
close(acc)
uniques := make(map[string][]string)
for msg := range acc {
key := fmt.Sprintf("%s/%d/%d", msg.Topic, msg.Partition, msg.Offset)
uniques[key] = append(uniques[key], msg.ConsumerID)
}
Expect(uniques).To(HaveLen(15000))
})
It("should allow close to be called multiple times", func() {
cs, err := newConsumerOf(testGroup, testTopics...)
Expect(err).NotTo(HaveOccurred())
Expect(cs.Close()).NotTo(HaveOccurred())
Expect(cs.Close()).NotTo(HaveOccurred())
})
})