I forgot to include some information about this problem. When I sent
the produce request, the following appeared in server.log:
[2016-01-10 23:03:44,957] ERROR [KafkaApi-3] error when handling
request Name: ProducerRequest; Version: 0; CorrelationId: 1; ClientId:
null; RequiredAcks: 1; AckTimeoutMs: 10000 ms; TopicAndPartition:
[topic_1,3] -> 37 (kafka.server.KafkaApis)
java.lang.NullPointerException
at
org.apache.kafka.common.metrics.JmxReporter.getMBeanName(JmxReporter.java:127)
at
org.apache.kafka.common.metrics.JmxReporter.addAttribute(JmxReporter.java:106)
at
org.apache.kafka.common.metrics.JmxReporter.metricChange(JmxReporter.java:76)
at
org.apache.kafka.common.metrics.Metrics.registerMetric(Metrics.java:288)
at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:177)
at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:162)
at
kafka.server.ClientQuotaManager.getOrCreateQuotaSensors(ClientQuotaManager.scala:209)
at
kafka.server.ClientQuotaManager.recordAndMaybeThrottle(ClientQuotaManager.scala:111)
at
kafka.server.KafkaApis.kafka$server$KafkaApis$$sendResponseCallback$2(KafkaApis.scala:353)
at
kafka.server.KafkaApis$$anonfun$handleProducerRequest$1.apply(KafkaApis.scala:371)
at
kafka.server.KafkaApis$$anonfun$handleProducerRequest$1.apply(KafkaApis.scala:371)
at
kafka.server.ReplicaManager.appendMessages(ReplicaManager.scala:348)
at
kafka.server.KafkaApis.handleProducerRequest(KafkaApis.scala:366)
at kafka.server.KafkaApis.handle(KafkaApis.scala:68)
at
kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:60)
at java.lang.Thread.run(Thread.java:745)
Later when I tried sending another produce request I got a somewhat
similar error:
[2016-01-11 08:15:05,153] ERROR [KafkaApi-3] error when handling
request Name: ProducerRequest; Version: 0; CorrelationId: 1; ClientId:
null; RequiredAcks: 1; AckTimeoutMs: 10000 ms; TopicAndPartition:
[topic_1,3] -> 37 (kafka.server.KafkaApis)
java.lang.IllegalArgumentException: A metric named 'MetricName
[name=throttle-time, group=Produce, description=Tracking average
throttle-time per client, tags={client-id=null}]' already exists, can't
register another one.
at
org.apache.kafka.common.metrics.Metrics.registerMetric(Metrics.java:285)
at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:177)
at org.apache.kafka.common.metrics.Sensor.add(Sensor.java:162)
at
kafka.server.ClientQuotaManager.getOrCreateQuotaSensors(ClientQuotaManager.scala:209)
at
kafka.server.ClientQuotaManager.recordAndMaybeThrottle(ClientQuotaManager.scala:111)
at
kafka.server.KafkaApis.kafka$server$KafkaApis$$sendResponseCallback$2(KafkaApis.scala:353)
at
kafka.server.KafkaApis$$anonfun$handleProducerRequest$1.apply(KafkaApis.scala:371)
at
kafka.server.KafkaApis$$anonfun$handleProducerRequest$1.apply(KafkaApis.scala:371)
at
kafka.server.ReplicaManager.appendMessages(ReplicaManager.scala:348)
at
kafka.server.KafkaApis.handleProducerRequest(KafkaApis.scala:366)
at kafka.server.KafkaApis.handle(KafkaApis.scala:68)
at
kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:60)
at java.lang.Thread.run(Thread.java:745)
In both cases I was running kafka-console-consumer.sh to consume
messages from the topic I was sending to, and the consumer did see the
message I sent.
Dave
-----Original Message-----
From: d...@dspeterson.com
Sent: Monday, January 11, 2016 12:32am
To: users@kafka.apache.org
Subject: trouble sending produce requests to 0.9.0.0 broker cluster
Hi,
I'm having trouble sending produce requests to a Kafka 0.9.0.0 broker
cluster consisting of 4 brokers with IDs 0, 1, 2, and 3. All 4
brokers are running locally on my CentOS 7 development box, listening
on ports 9092, 9093, 9094, and 9095 respectively. I am running my
own producer code (Bruce, see https://github.com/ifwe/bruce), which
works without problems with Kafka 0.8, but has problems with 0.9.0.0.
When I send a produce request consisting of a single message, I often
get a response consisting of error ACK -1 (Unknown, unexpected server
error) although I have also seen other errors such as 6
(NotLeaderForPartition). During one observed instance of this
behavior I saw the following:
sent produce request
--------------------
- single message set containing a single message
- topic: "topic_1"
- partition: 3
- empty key
- value: "hello world"
- API key: 0 (produce request)
- API version: 0
- correlation ID: 1
- empty client ID
- required ACKs: 1
- timeout: 10000
- message magic byte: 0
- message attributes: 0 (no compression)
- destination broker ID: 3
received produce response
-------------------------
- correlation ID: 1
- topic: "topic_1"
- partition: 3
- error code: -1
I have included tcpdump output for the above request and response
below. The topic/partition layout is as follows:
$ bin/kafka-topics.sh --describe --zookeeper
localhost:2181/kafka-0.9.0.0
Topic:topic_1 PartitionCount:4 ReplicationFactor:2
Configs:
Topic: topic_1 Partition: 0 Leader: 0 Replicas: 0,1
Isr: 0,1
Topic: topic_1 Partition: 1 Leader: 1 Replicas: 1,2
Isr: 2,1
Topic: topic_1 Partition: 2 Leader: 2 Replicas: 2,3
Isr: 2,3
Topic: topic_1 Partition: 3 Leader: 3 Replicas: 3,0
Isr: 0,3
$
Does anyone have any ideas about what may be causing this behavior?
Additionally, I was using tcpdump to watch communication between
kafka-console-producer.sh and the broker cluster, and noticed that
the console producer sends a value of 1 for the API version in its
produce requests. Is there any documentation describing protocol
changes between API versions 0 and 1? I looked here:
https://cwiki.apache.org/confluence/display/KAFKA/A+Guide+To+The+Kafka+Protocol
and didn't see anything about the new API version. Any help is much
appreciated.
Thanks,
Dave
Produce request...
# tcpdump -i lo -X -s 0 -nn src port 51147
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on lo, link-type EN10MB (Ethernet), capture size 65535 bytes
23:03:44.947589 IP 127.0.0.1.51147 > 127.0.0.1.9095: Flags [P.], seq
2040824198:2040824280, ack 1758705421, win 342, options [nop,nop,TS val
71321820 ecr 71222139], length 82
0x0000: 4500 0086 4300 4000 4006 f96f 7f00 0001 E...C.@.@..o....
0x0010: 7f00 0001 c7cb 2387 79a4 8186 68d3 b70d ......#.y...h...
0x0020: 8018 0156 fe7a 0000 0101 080a 0440 48dc ...V.z.......@H.
0x0030: 043e c37b 0000 004e 0000 0000 0000 0001 .>.{...N........
0x0040: ffff 0001 0000 2710 0000 0001 0007 746f ......'.......to
0x0050: 7069 635f 3100 0000 0100 0000 0300 0000 pic_1...........
0x0060: 2500 0000 0000 0000 0000 0000 1973 acf7 %............s..
0x0070: 7c00 00ff ffff ff00 0000 0b68 656c 6c6f |..........hello
0x0080: 2077 6f72 6c64 .world
23:03:44.956525 IP 127.0.0.1.51147 > 127.0.0.1.9095: Flags [.], ack
40, win 342, options [nop,nop,TS val 71321830 ecr 71321830], length 0
0x0000: 4500 0034 4301 4000 4006 f9c0 7f00 0001 E..4C.@.@.......
0x0010: 7f00 0001 c7cb 2387 79a4 81d8 68d3 b734 ......#.y...h..4
0x0020: 8010 0156 fe28 0000 0101 080a 0440 48e6 ...V.(.......@H.
0x0030: 0440 48e6 .@H.
^C
2 packets captured
4 packets received by filter
0 packets dropped by kernel
#
Produce response...
# tcpdump -i lo -X -s 0 -nn dst port 51147
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on lo, link-type EN10MB (Ethernet), capture size 65535 bytes
23:03:44.947661 IP 127.0.0.1.9095 > 127.0.0.1.51147: Flags [.], ack
2040824280, win 32742, options [nop,nop,TS val 71321821 ecr 71321820],
length 0
0x0000: 4500 0034 7476 4000 4006 c84b 7f00 0001 E..4tv@.@..K....
0x0010: 7f00 0001 2387 c7cb 68d3 b70d 79a4 81d8 ....#...h...y...
0x0020: 8010 7fe6 fe28 0000 0101 080a 0440 48dd .....(.......@H.
0x0030: 0440 48dc .@H.
23:03:44.956499 IP 127.0.0.1.9095 > 127.0.0.1.51147: Flags [P.], seq
0:39, ack 1, win 32742, options [nop,nop,TS val 71321830 ecr 71321820],
length 39
0x0000: 4500 005b 7477 4000 4006 c823 7f00 0001 E..[tw@.@..#....
0x0010: 7f00 0001 2387 c7cb 68d3 b70d 79a4 81d8 ....#...h...y...
0x0020: 8018 7fe6 fe4f 0000 0101 080a 0440 48e6 .....O.......@H.
0x0030: 0440 48dc 0000 0023 0000 0001 0000 0001 .@H....#........
0x0040: 0007 746f 7069 635f 3100 0000 0100 0000 ..topic_1.......
0x0050: 03ff ffff ffff ffff ffff ff ...........
^C
2 packets captured
4 packets received by filter
0 packets dropped by kernel
#
