I have kafka running in docker container as:
I had the message produced to this kafka and now would like to consume through spring boot. I used the codebase from this repo:
while running the consumer, I am getting flooding of flowing error.
[Consumer clientId=consumer-group_id-1, groupId=group_id] Bootstrap broker kafka:9093 (id: -1 rack: null) disconnected
I have kafka hostname resolved through hostfile.
I even added ssl properties as:
spring.kafka.ssl.key-store-location=file:/tmp/secrets/client_keystore.jks
spring.kafka.ssl.trust-store-location=file:/tmp/secrets/truststore.jks
spring.kafka.ssl.key-store-password=foobar
spring.kafka.ssl.trust-store-password=foobar
spring.kafka.ssl.key-store-type=JKS
spring.kafka.ssl.trust-store-type=JKS
but couldn't figure out why I am not able to connect to topic from spring-boot. However, I am able to consume from python as:
# Setup consumer properties
broker_host = properties.get("client.consumer.broker.hosts") #kafka
broker_port = properties.get("client.consumer.broker.port") #9093
sink_topic = properties.get("client.consumer.topic") # my-private-topic
# Load SSL properties
ssl_security_protocol = properties.get("ssl.security.protocol") #SSL
ssl_ca_location = properties.get("ssl.ca.location") #/tmp/secrets/fake-ca-crt.pem
ssl_cert_location = properties.get("ssl.cert.location") #tmp/secrets/client_cert.pem
ssl_key_location = properties.get("ssl.key.location") #/tmp/secrets/client_key.pem
# Load record avro schema
record_schema_path = os.path.join(dirname, properties["schema.location"])
record_schema = loads(open(record_schema_path).read())
deserializer = SdpAvroDeserializer(record_schema)
# Create a kafka consumer
# Set enable.auto.commit to False to consume from the beginning of time
# Set enable.auto.commit to True to only consume what hasn't been consumed yet
props = {"bootstrap.servers": broker_host + ":" + str(broker_port),
"default.topic.config": {"auto.offset.reset": "earliest"},
"group.id": "python-consumer-example-group",
"enable.auto.commit": False,
"security.protocol": ssl_security_protocol,
"ssl.ca.location": ssl_ca_location,
"ssl.certificate.location": ssl_cert_location,
"ssl.key.location": ssl_key_location
}
consumer = KafkaConsumer(props)
consumer.subscribe([sink_topic])
print(f"Start consuming from {sink_topic} at {broker_host} for {listenTimeoutSeconds} seconds")
t_end = time.time() + listenTimeoutSeconds
while (time.time() < t_end):
message = consumer.poll(10)
# print(message)
# print("test\n")
# print(message.value())
if message and message.value() and not message.error():
header, payload = deserializer.decode(message.value(), deserialize_header=True)
if include_record_metadata.lower() == 'true':
print("Message metadata: %s" % header)
print("Message payload: %s" % payload)
so what I am missing in spring boot to consume the message from kafka?
OUTPUT:
2022-02-03 00:36:50.431 INFO 20840 --- [ main] c.h.k.d.SpringBootKafkaAppApplication : No active profile set, falling back to default profiles: default
2022-02-03 00:36:51.110 INFO 20840 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 9000 (http)
2022-02-03 00:36:51.118 INFO 20840 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-02-03 00:36:51.118 INFO 20840 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.35]
2022-02-03 00:36:51.178 INFO 20840 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-02-03 00:36:51.178 INFO 20840 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 714 ms
2022-02-03 00:36:51.326 INFO 20840 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2022-02-03 00:36:51.475 INFO 20840 --- [ main] o.a.k.clients.consumer.ConsumerConfig : ConsumerConfig values:
allow.auto.create.topics = true
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [kafka:9093]
check.crcs = true
client.dns.lookup = default
client.id =
client.rack =
connections.max.idle.ms = 540000
default.api.timeout.ms = 60000
enable.auto.commit = false
exclude.internal.topics = true
fetch.max.bytes = 52428800
fetch.max.wait.ms = 500
fetch.min.bytes = 1
group.id = group_id
group.instance.id = null
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
isolation.level = read_uncommitted
key.deserializer = class org.apache.kafka.common.serialization.StringDeserializer
max.partition.fetch.bytes = 1048576
max.poll.interval.ms = 300000
max.poll.records = 500
metadata.max.age.ms = 300000
metric.reporters = []
metrics.num.samples = 2
metrics.recording.level = INFO
metrics.sample.window.ms = 30000
partition.assignment.strategy = [class org.apache.kafka.clients.consumer.RangeAssignor]
receive.buffer.bytes = 65536
reconnect.backoff.max.ms = 1000
reconnect.backoff.ms = 50
request.timeout.ms = 30000
retry.backoff.ms = 100
sasl.client.callback.handler.class = null
sasl.jaas.config = null
sasl.kerberos.kinit.cmd = /usr/bin/kinit
sasl.kerberos.min.time.before.relogin = 60000
sasl.kerberos.service.name = null
sasl.kerberos.ticket.renew.jitter = 0.05
sasl.kerberos.ticket.renew.window.factor = 0.8
sasl.login.callback.handler.class = null
sasl.login.class = null
sasl.login.refresh.buffer.seconds = 300
sasl.login.refresh.min.period.seconds = 60
sasl.login.refresh.window.factor = 0.8
sasl.login.refresh.window.jitter = 0.05
sasl.mechanism = GSSAPI
security.protocol = PLAINTEXT
security.providers = null
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = /tmp/secrets/client_keystore.jks
ssl.keystore.password = [hidden]
ssl.keystore.type = JKS
ssl.protocol = TLSv1.2
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = /tmp/secrets/truststore.jks
ssl.truststore.password = [hidden]
ssl.truststore.type = JKS
value.deserializer = class org.springframework.kafka.support.serializer.JsonDeserializer
2022-02-03 00:36:51.550 INFO 20840 --- [ main] o.a.kafka.common.utils.AppInfoParser : Kafka version: 2.5.0
2022-02-03 00:36:51.551 INFO 20840 --- [ main] o.a.kafka.common.utils.AppInfoParser : Kafka commitId: 66563e712b0b9f84
2022-02-03 00:36:51.551 INFO 20840 --- [ main] o.a.kafka.common.utils.AppInfoParser : Kafka startTimeMs: 1643866611549
2022-02-03 00:36:51.553 INFO 20840 --- [ main] o.a.k.clients.consumer.KafkaConsumer : [Consumer clientId=consumer-group_id-1, groupId=group_id] Subscribed to topic(s): my-private-topic
2022-02-03 00:36:51.554 INFO 20840 --- [ main] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService
2022-02-03 00:36:51.576 INFO 20840 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 9000 (http) with context path ''
2022-02-03 00:36:51.583 INFO 20840 --- [ main] c.h.k.d.SpringBootKafkaAppApplication : Started SpringBootKafkaAppApplication in 1.405 seconds (JVM running for 1.727)
2022-02-03 00:36:52.036 WARN 20840 --- [ntainer#0-0-C-1] org.apache.kafka.clients.NetworkClient : [Consumer clientId=consumer-group_id-1, groupId=group_id] Bootstrap broker kafka:9093 (id: -1 rack: null) disconnected
2022-02-03 00:36:52.302 WARN 20840 --- [ntainer#0-0-C-1] org.apache.kafka.clients.NetworkClient : [Consumer clientId=consumer-group_id-1, groupId=group_id] Bootstrap broker kafka:9093 (id: -1 rack: null) disconnected
2022-02-03 00:36:52.569 WARN 20840 --- [ntainer#0-0-C-1] org.apache.kafka.clients.NetworkClient : [Consumer clientId=consumer-group_id-1, groupId=group_id] Bootstrap broker kafka:9093 (id: -1 rack: null) disconnected
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