我有一个非常简单的 Beam Pipeline，它从 Kafka 主题读取记录并将其写入 Pulsar 主题:
PipelineOptions options = PipelineOptionsFactory.create();
Pipeline p = Pipeline.create(options);
p.apply(
KafkaIO.<Long, String>read()
.withTopic("<topic>")
.withBootstrapServers("<url>")
.withKeyDeserializer(LongDeserializer.class)
.withValueDeserializer(StringDeserializer.class)
.updateConsumerProperties(getConsumerProps())
.withoutMetadata() // PCollection<KV<Long, String>>
)
.apply(Values.<String>create())
.apply(ParDo.of(new PulsarSink()));
p.run();
根据我的理解，这应该创建一个 Kafka Consumer，将其值插入管道。现在，由于某种原因，管道似乎一次又一次地重新启动，创建多个 Kafka 消费者和多个 Pulsar 生产者。
以下是日志的摘录，显示正在创建多个 Kafka Consumer:
2019-06-07 16:08:30,010 INFO o.a.k.c.consumer.ConsumerConfig - ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [<url>:39701, <url>:39702, <url>:39703]
check.crcs = true
client.dns.lookup = default
client.id =
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 = 292330999892453
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
isolation.level = read_uncommitted
key.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
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 = 524288
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 = [hidden]
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 = SCRAM-SHA-256
security.protocol = SASL_SSL
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLS
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
value.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
2019-06-07 16:08:30,097 INFO o.a.k.c.s.a.AbstractLogin - Successfully logged in.
2019-06-07 16:08:30,204 INFO o.a.kafka.common.utils.AppInfoParser - Kafka version : 2.1.0
2019-06-07 16:08:30,205 INFO o.a.kafka.common.utils.AppInfoParser - Kafka commitId : eec43959745f444f
2019-06-07 16:08:30,684 INFO org.apache.kafka.clients.Metadata - Cluster ID: AKrCWqWfQKOfb9OSgwFyIQ
2019-06-07 16:08:30,693 INFO o.a.b.s.i.kafka.KafkaUnboundedSource - Partitions assigned to split 0 (total 1): 292330999892453.events.all.v1.json-0
2019-06-07 16:08:30,693 INFO o.a.b.s.i.kafka.KafkaUnboundedSource - Partitions assigned to split 1 (total 1): 292330999892453.events.all.v1.json-1
2019-06-07 16:08:30,693 INFO o.a.b.s.i.kafka.KafkaUnboundedSource - Partitions assigned to split 2 (total 1): 292330999892453.events.all.v1.json-2
2019-06-07 16:08:30,720 INFO o.a.k.c.consumer.ConsumerConfig - ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [<url>:39701, <url>:39702, <url>:39703]
check.crcs = true
client.dns.lookup = default
client.id =
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 = 292330999892453
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
isolation.level = read_uncommitted
key.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
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 = 524288
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 = [hidden]
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 = SCRAM-SHA-256
security.protocol = SASL_SSL
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLS
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
value.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
2019-06-07 16:08:30,720 INFO o.a.k.c.consumer.ConsumerConfig - ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [<url>:39701, <url>:39702, <url>:39703]
check.crcs = true
client.dns.lookup = default
client.id =
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 = 292330999892453
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
isolation.level = read_uncommitted
key.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
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 = 524288
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 = [hidden]
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 = SCRAM-SHA-256
security.protocol = SASL_SSL
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLS
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
value.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
2019-06-07 16:08:30,720 INFO o.a.k.c.consumer.ConsumerConfig - ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [<url>:39701, <url>:39702, <url>:39703]
check.crcs = true
client.dns.lookup = default
client.id =
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 = 292330999892453
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
isolation.level = read_uncommitted
key.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
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 = 524288
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 = [hidden]
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 = SCRAM-SHA-256
security.protocol = SASL_SSL
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLS
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
value.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
2019-06-07 16:08:30,721 INFO o.a.k.c.s.a.AbstractLogin - Successfully logged in.
2019-06-07 16:08:30,734 INFO o.a.kafka.common.utils.AppInfoParser - Kafka version : 2.1.0
2019-06-07 16:08:30,734 INFO o.a.kafka.common.utils.AppInfoParser - Kafka commitId : eec43959745f444f
2019-06-07 16:08:30,742 INFO o.a.kafka.common.utils.AppInfoParser - Kafka version : 2.1.0
2019-06-07 16:08:30,742 INFO o.a.kafka.common.utils.AppInfoParser - Kafka commitId : eec43959745f444f
2019-06-07 16:08:30,743 INFO o.a.kafka.common.utils.AppInfoParser - Kafka version : 2.1.0
2019-06-07 16:08:30,743 INFO o.a.kafka.common.utils.AppInfoParser - Kafka commitId : eec43959745f444f
2019-06-07 16:08:31,116 INFO org.apache.kafka.clients.Metadata - Cluster ID: AKrCWqWfQKOfb9OSgwFyIQ
2019-06-07 16:08:31,117 INFO o.a.k.c.c.i.AbstractCoordinator - [Consumer clientId=consumer-2, groupId=292330999892453] Discovered group coordinator <url>:39703 (id: 2147483644 rack: null)
2019-06-07 16:08:31,145 INFO org.apache.kafka.clients.Metadata - Cluster ID: AKrCWqWfQKOfb9OSgwFyIQ
2019-06-07 16:08:31,145 INFO o.a.k.c.c.i.AbstractCoordinator - [Consumer clientId=consumer-3, groupId=292330999892453] Discovered group coordinator <url>:39703 (id: 2147483644 rack: null)
2019-06-07 16:08:31,147 INFO org.apache.kafka.clients.Metadata - Cluster ID: AKrCWqWfQKOfb9OSgwFyIQ
2019-06-07 16:08:31,148 INFO o.a.k.c.c.i.AbstractCoordinator - [Consumer clientId=consumer-4, groupId=292330999892453] Discovered group coordinator <url>:39703 (id: 2147483644 rack: null)
2019-06-07 16:08:31,351 INFO o.a.b.s.i.kafka.KafkaUnboundedSource - Reader-0: reading from 292330999892453.events.all.v1.json-0 starting at offset 318186186
2019-06-07 16:08:31,352 INFO o.a.k.c.consumer.ConsumerConfig - ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [<url>:39701, <url>:39702, <url>:39703]
check.crcs = true
client.dns.lookup = default
client.id =
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 = Reader-0_offset_consumer_1189437256_292330999892453
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
isolation.level = read_uncommitted
key.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
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 = 524288
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 = [hidden]
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 = SCRAM-SHA-256
security.protocol = SASL_SSL
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLS
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
value.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
2019-06-07 16:08:31,359 INFO o.a.kafka.common.utils.AppInfoParser - Kafka version : 2.1.0
2019-06-07 16:08:31,359 INFO o.a.kafka.common.utils.AppInfoParser - Kafka commitId : eec43959745f444f
2019-06-07 16:08:31,389 INFO o.a.b.s.i.kafka.KafkaUnboundedSource - Reader-1: reading from 292330999892453.events.all.v1.json-1 starting at offset 318738731
2019-06-07 16:08:31,389 INFO o.a.k.c.consumer.ConsumerConfig - ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [<url>:39701, <url>:39702, <url>:39703]
check.crcs = true
client.dns.lookup = default
client.id =
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 = Reader-1_offset_consumer_1231768376_292330999892453
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
isolation.level = read_uncommitted
key.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
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 = 524288
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 = [hidden]
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 = SCRAM-SHA-256
security.protocol = SASL_SSL
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLS
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
value.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
2019-06-07 16:08:31,394 INFO o.a.b.s.i.kafka.KafkaUnboundedSource - Reader-2: reading from 292330999892453.events.all.v1.json-2 starting at offset 318129714
2019-06-07 16:08:31,394 INFO o.a.k.c.consumer.ConsumerConfig - ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [<url>:39701, <url>:39702, <url>:39703]
check.crcs = true
client.dns.lookup = default
client.id =
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 = Reader-2_offset_consumer_64443017_292330999892453
heartbeat.interval.ms = 3000
interceptor.classes = []
internal.leave.group.on.close = true
isolation.level = read_uncommitted
key.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
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 = 524288
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 = [hidden]
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 = SCRAM-SHA-256
security.protocol = SASL_SSL
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLS
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
value.deserializer = class org.apache.kafka.common.serialization.ByteArrayDeserializer
2019-06-07 16:08:31,395 INFO o.a.kafka.common.utils.AppInfoParser - Kafka version : 2.1.0
2019-06-07 16:08:31,395 INFO o.a.kafka.common.utils.AppInfoParser - Kafka commitId : eec43959745f444f
2019-06-07 16:08:31,397 INFO o.a.kafka.common.utils.AppInfoParser - Kafka version : 2.1.0
2019-06-07 16:08:31,398 INFO o.a.kafka.common.utils.AppInfoParser - Kafka commitId : eec43959745f444f
2019-06-07 16:08:31,613 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-3, groupId=292330999892453] Fetch offset 318129714 is out of range for partition 292330999892453.events.all.v1.json-2, resetting offset
2019-06-07 16:08:31,613 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-2, groupId=292330999892453] Fetch offset 318186186 is out of range for partition 292330999892453.events.all.v1.json-0, resetting offset
2019-06-07 16:08:31,641 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-3, groupId=292330999892453] Resetting offset for partition 292330999892453.events.all.v1.json-2 to offset 320367573.
2019-06-07 16:08:31,641 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-2, groupId=292330999892453] Resetting offset for partition 292330999892453.events.all.v1.json-0 to offset 321301099.
2019-06-07 16:08:31,648 INFO org.apache.kafka.clients.Metadata - Cluster ID: AKrCWqWfQKOfb9OSgwFyIQ
2019-06-07 16:08:31,649 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-4, groupId=292330999892453] Fetch offset 318738731 is out of range for partition 292330999892453.events.all.v1.json-1, resetting offset
2019-06-07 16:08:31,667 INFO org.apache.kafka.clients.Metadata - Cluster ID: AKrCWqWfQKOfb9OSgwFyIQ
2019-06-07 16:08:31,672 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-4, groupId=292330999892453] Resetting offset for partition 292330999892453.events.all.v1.json-1 to offset 320867070.
2019-06-07 16:08:31,714 INFO org.apache.kafka.clients.Metadata - Cluster ID: AKrCWqWfQKOfb9OSgwFyIQ
2019-06-07 16:08:31,860 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-5, groupId=Reader-0_offset_consumer_1189437256_292330999892453] Resetting offset for partition 292330999892453.events.all.v1.json-0 to offset 336281187.
2019-06-07 16:08:31,885 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-5, groupId=Reader-0_offset_consumer_1189437256_292330999892453] Resetting offset for partition 292330999892453.events.all.v1.json-0 to offset 336281187.
2019-06-07 16:08:31,905 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-6, groupId=Reader-1_offset_consumer_1231768376_292330999892453] Resetting offset for partition 292330999892453.events.all.v1.json-1 to offset 336474159.
2019-06-07 16:08:31,938 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-6, groupId=Reader-1_offset_consumer_1231768376_292330999892453] Resetting offset for partition 292330999892453.events.all.v1.json-1 to offset 336474159.
2019-06-07 16:08:31,957 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-7, groupId=Reader-2_offset_consumer_64443017_292330999892453] Resetting offset for partition 292330999892453.events.all.v1.json-2 to offset 336295646.
2019-06-07 16:08:31,981 INFO o.a.k.c.consumer.internals.Fetcher - [Consumer clientId=consumer-7, groupId=Reader-2_offset_consumer_64443017_292330999892453] Resetting offset for partition 292330999892453.events.all.v1.json-2 to offset 336295646.
2019-06-07 16:08:32,142 INFO o.a.b.s.i.kafka.KafkaUnboundedSource - Reader-0: first record offset 321301099
为什么 Kafka Consumer 会一次又一次地重新启动？这是预期的行为吗？
最佳答案
DirectRunner 的主要目的是管道的本地测试。因此，它表现出的行为可能在性能方面可能不是最佳的。一个例子可能是它有目的地序列化和反序列化运算符(operator)之间的数据，即使这不是必需的。原因是验证应用程序代码不会修改输入对象，这在 Beam 中是禁止的。创建许多消费者的原因是另一个例子 - DirectRunner 经常执行检查点(包括许多可能不必要的步骤，例如重新创建消费者) - 请参阅 here .
因此，DirectRunner 确实应该仅在测试和/或中等条件下使用，此时性能不是问题。当性能是一个问题时，应该使用不同的运行器 - 要么是此类运行器的分布式版本，要么是本地版本 - 例如本地 FlinkRunner。
关于java - Apache 光束 : Kafka consumer restarted over and over again，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56496611/