我正在使用kafka_2.11-0.10.2.1和Google提供的PubSub连接器。我要做的就是使用独立连接器将数据从Kafka主题推到PubSub One。我遵循了所有的步骤：
- 生产
cps-kafka-connector.jar - 在Kafka的
config目录中添加了cps-sink-connector.properties文件。该文件看起来像这样：
name=CPSConnector connector.class=com.google.pubsub.kafka.sink.CloudPubSubSinkConnector tasks.max=10 topics=kafka_topic cps.topic=pubsub_topic cps.project=my_gcp_project_12345
- 我确保我在
connect-standalone.properties中启用string转换器，因为我的目的是仅发送字符串消息：
key.converter=org.apache.kafka.connect.storage.StringConverter value.converter=org.apache.kafka.connect.storage.StringConverter
- 我创建了一个主题
kafka_topic，并发送了一些消息，如下所示：
$ bin/kafka-console-producer.sh --broker-list localhost:9092 --topic kafka_topic $ hello streams $ kafka streams rock
- 我运行了连接器如下：
$ bin/connect-standalone.sh config/connect-standalone.properties config/cps-sink-connector.properties
的意图是运行：
$ gcloud beta pubsub subscriptions pull subscription_to_pubsub_topic
收集这些消息。但是，下面的错误进一步发生了，我无法围绕它们。
它们似乎与jetty-9.2.15.v20160210相关联。注意：
[2017-05-04 22:42:26,635] ERROR Commit of WorkerSinkTask{id=CPSConnector-0} offsets threw an unexpected exception:(org.apache.kafka.connect.runtime.WorkerSinkTask:204)
java.lang.RuntimeException: java.util.concurrent.ExecutionException: io.grpc.StatusRuntimeException: UNKNOWN
和
Caused by: java.util.concurrent.ExecutionException: io.grpc.StatusRuntimeException: UNKNOWN ...
Caused by: io.grpc.StatusRuntimeException: UNKNOWN ...
Caused by: java.lang.IllegalArgumentException: Jetty ALPN/NPN has not been properly configured ...
有什么想法吗？如何配置码头？我在这里读了一篇文章，其中指出：
今天没有标准的Java发布对ALPN的内置支持(有 跟踪问题，所以请进行投票！(，所以我们需要使用Jetty-Alpn (如果在Java＆lt; 8上(OpenJDK的BootClassPath扩展程序。到 执行此操作，添加一个XbootClassPath JVM选项参考路径 JETTY ALPN-boot Jar。
java -Xbootclasspath/p:/path/to/jetty/alpn/extension.jar ...
请注意，您必须使用特定于Jetty-Alpn Jar的释放 您正在使用的Java版本。但是，您可以使用JVM代理 jeety-alpn代理加载正确的码头alpn-boot jar文件 当前Java版本。为此，而不是添加XbootClassPath 选项，添加Javaagent JVM选项参考码头的路径 alpn代理罐。
java -javaagent:/path/to/jetty-alpn-agent.jar ...
...但是我真的没有如何在配置中考虑这一点。有什么想法吗？错误日志的一部分显示在下面：
...
name = CPSConnector
tasks.max = 10
transforms = null
value.converter = null
(org.apache.kafka.connect.runtime.ConnectorConfig:180)
[2017-05-04 22:42:17,447] INFO TaskConfig values:
task.class = class com.google.pubsub.kafka.sink.CloudPubSubSinkTask
(org.apache.kafka.connect.runtime.TaskConfig:180)
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@6fda6170] Created with target pubsub.googleapis.com:443
[2017-05-04 22:42:17,447] INFO Instantiated task CPSConnector-7 with version 0.10.2.1 of type com.google.pubsub.kafka.sink.CloudPubSubSinkTask (org.apache.kafka.connect.runtime.Worker:317)
[2017-05-04 22:42:17,451] INFO ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [localhost:9092]
check.crcs = true
client.id =
connections.max.idle.ms = 540000
enable.auto.commit = false
exclude.internal.topics = true
fetch.max.bytes = 52428800
fetch.max.wait.ms = 500
fetch.min.bytes = 1
group.id = connect-CPSConnector
heartbeat.interval.ms = 3000
interceptor.classes = null
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 = 65536
reconnect.backoff.ms = 50
request.timeout.ms = 305000
retry.backoff.ms = 100
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.mechanism = GSSAPI
security.protocol = PLAINTEXT
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = null
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
(org.apache.kafka.clients.consumer.ConsumerConfig:180)
[2017-05-04 22:42:17,461] INFO Kafka version : 0.10.2.1 (org.apache.kafka.common.utils.AppInfoParser:83)
[2017-05-04 22:42:17,461] INFO Kafka commitId : e89bffd6b2eff799 (org.apache.kafka.common.utils.AppInfoParser:84)
[2017-05-04 22:42:17,462] INFO Creating task CPSConnector-8 (org.apache.kafka.connect.runtime.Worker:305)
[2017-05-04 22:42:17,463] INFO ConnectorConfig values:
connector.class = com.google.pubsub.kafka.sink.CloudPubSubSinkConnector
key.converter = null
name = CPSConnector
tasks.max = 10
transforms = null
value.converter = null
(org.apache.kafka.connect.runtime.ConnectorConfig:180)
[2017-05-04 22:42:17,463] INFO TaskConfig values:
task.class = class com.google.pubsub.kafka.sink.CloudPubSubSinkTask
(org.apache.kafka.connect.runtime.TaskConfig:180)
[2017-05-04 22:42:17,463] INFO Instantiated task CPSConnector-8 with version 0.10.2.1 of type com.google.pubsub.kafka.sink.CloudPubSubSinkTask (org.apache.kafka.connect.runtime.Worker:317)
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@74e87b55] Created with target pubsub.googleapis.com:443
[2017-05-04 22:42:17,465] INFO ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [localhost:9092]
check.crcs = true
client.id =
connections.max.idle.ms = 540000
enable.auto.commit = false
exclude.internal.topics = true
fetch.max.bytes = 52428800
fetch.max.wait.ms = 500
fetch.min.bytes = 1
group.id = connect-CPSConnector
heartbeat.interval.ms = 3000
interceptor.classes = null
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 = 65536
reconnect.backoff.ms = 50
request.timeout.ms = 305000
retry.backoff.ms = 100
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.mechanism = GSSAPI
security.protocol = PLAINTEXT
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = null
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
(org.apache.kafka.clients.consumer.ConsumerConfig:180)
[2017-05-04 22:42:17,469] INFO Kafka version : 0.10.2.1 (org.apache.kafka.common.utils.AppInfoParser:83)
[2017-05-04 22:42:17,472] INFO Kafka commitId : e89bffd6b2eff799 (org.apache.kafka.common.utils.AppInfoParser:84)
[2017-05-04 22:42:17,478] INFO Creating task CPSConnector-9 (org.apache.kafka.connect.runtime.Worker:305)
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@15768b04] Created with target pubsub.googleapis.com:443
[2017-05-04 22:42:17,484] INFO ConnectorConfig values:
connector.class = com.google.pubsub.kafka.sink.CloudPubSubSinkConnector
key.converter = null
name = CPSConnector
tasks.max = 10
transforms = null
value.converter = null
(org.apache.kafka.connect.runtime.ConnectorConfig:180)
[2017-05-04 22:42:17,486] INFO TaskConfig values:
task.class = class com.google.pubsub.kafka.sink.CloudPubSubSinkTask
(org.apache.kafka.connect.runtime.TaskConfig:180)
[2017-05-04 22:42:17,486] INFO Instantiated task CPSConnector-9 with version 0.10.2.1 of type com.google.pubsub.kafka.sink.CloudPubSubSinkTask (org.apache.kafka.connect.runtime.Worker:317)
[2017-05-04 22:42:17,486] INFO ConsumerConfig values:
auto.commit.interval.ms = 5000
auto.offset.reset = earliest
bootstrap.servers = [localhost:9092]
check.crcs = true
client.id =
connections.max.idle.ms = 540000
enable.auto.commit = false
exclude.internal.topics = true
fetch.max.bytes = 52428800
fetch.max.wait.ms = 500
fetch.min.bytes = 1
group.id = connect-CPSConnector
heartbeat.interval.ms = 3000
interceptor.classes = null
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 = 65536
reconnect.backoff.ms = 50
request.timeout.ms = 305000
retry.backoff.ms = 100
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.mechanism = GSSAPI
security.protocol = PLAINTEXT
send.buffer.bytes = 131072
session.timeout.ms = 10000
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = null
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
(org.apache.kafka.clients.consumer.ConsumerConfig:180)
[2017-05-04 22:42:17,492] INFO Kafka version : 0.10.2.1 (org.apache.kafka.common.utils.AppInfoParser:83)
[2017-05-04 22:42:17,493] INFO Kafka commitId : e89bffd6b2eff799 (org.apache.kafka.common.utils.AppInfoParser:84)
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@2aa0b78d] Created with target pubsub.googleapis.com:443
[2017-05-04 22:42:17,496] INFO Created connector CPSConnector (org.apache.kafka.connect.cli.ConnectStandalone:90)
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@1bb167da] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@41380fb7] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@7ecb1a4d] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@4db17054] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@3ca410f4] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@611d92fb] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@7a2f9bb8] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@24675ca9] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@7e101025] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@65220a00] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@79a69904] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@4dcf0b0d] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@6440f37f] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@179dd4b2] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@67a3fdd] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@5a8c6de1] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@7b83e31f] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@3408c640] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@6b9cd402] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@3790445] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@2a583bab] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@68d47f55] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@3b0906db] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@4ef86c1f] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@793abbe9] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@2c734def] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@202098c0] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@3b129183] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@2058dcfd] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@c977767] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@1c4dbc55] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@48952135] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@31b59feb] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@21c700c] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@35a9958a] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@5611534b] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@5b844502] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@3af9d26e] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@3d18fe46] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@6910904f] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@3aa392ae] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@5f8e90f5] Created with target pubsub.googleapis.com:443
May 04, 2017 10:42:17 PM io.grpc.internal.ManagedChannelImpl <init>
INFO: [ManagedChannelImpl@5e5c05fe] Created with target pubsub.googleapis.com:443
...
Caused by: io.grpc.StatusRuntimeException: UNKNOWN
at io.grpc.Status.asRuntimeException(Status.java:545)
at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:417)
at io.grpc.ClientInterceptors$CheckedForwardingClientCall.start(ClientInterceptors.java:203)
at io.grpc.stub.ClientCalls.startCall(ClientCalls.java:248)
at io.grpc.stub.ClientCalls.asyncUnaryRequestCall(ClientCalls.java:227)
at io.grpc.stub.ClientCalls.futureUnaryCall(ClientCalls.java:186)
at com.google.pubsub.v1.PublisherGrpc$PublisherFutureStub.publish(PublisherGrpc.java:480)
at com.google.pubsub.kafka.sink.CloudPubSubGRPCPublisher.publish(CloudPubSubGRPCPublisher.java:44)
at com.google.pubsub.kafka.sink.CloudPubSubRoundRobinPublisher.publish(CloudPubSubRoundRobinPublisher.java:43)
at com.google.pubsub.kafka.sink.CloudPubSubSinkTask.publishMessagesForPartition(CloudPubSubSinkTask.java:321)
at com.google.pubsub.kafka.sink.CloudPubSubSinkTask.flush(CloudPubSubSinkTask.java:265)
... 22 more
Caused by: java.lang.IllegalArgumentException: Jetty ALPN/NPN has not been properly configured.
at io.grpc.netty.GrpcSslContexts.selectApplicationProtocolConfig(GrpcSslContexts.java:153)
at io.grpc.netty.GrpcSslContexts.configure(GrpcSslContexts.java:130)
at io.grpc.netty.GrpcSslContexts.configure(GrpcSslContexts.java:119)
at io.grpc.netty.GrpcSslContexts.forClient(GrpcSslContexts.java:90)
at io.grpc.netty.NettyChannelBuilder.createProtocolNegotiator(NettyChannelBuilder.java:263)
at io.grpc.netty.NettyChannelBuilder$NettyTransportFactory.newClientTransport(NettyChannelBuilder.java:322)
at io.grpc.internal.CallCredentialsApplyingTransportFactory.newClientTransport(CallCredentialsApplyingTransportFactory.java:62)
at io.grpc.internal.TransportSet.startNewTransport(TransportSet.java:199)
at io.grpc.internal.TransportSet.obtainActiveTransport(TransportSet.java:179)
at io.grpc.internal.ManagedChannelImpl$3.getTransport(ManagedChannelImpl.java:476)
at io.grpc.internal.ManagedChannelImpl$3.getTransport(ManagedChannelImpl.java:432)
at io.grpc.DummyLoadBalancerFactory$DummyLoadBalancer.pickTransport(DummyLoadBalancerFactory.java:105)
at io.grpc.internal.ManagedChannelImpl$1.get(ManagedChannelImpl.java:149)
at io.grpc.internal.ClientCallImpl.start(ClientCallImpl.java:201)
at io.grpc.auth.ClientAuthInterceptor$1.checkedStart(ClientAuthInterceptor.java:104)
at io.grpc.ClientInterceptors$CheckedForwardingClientCall.start(ClientInterceptors.java:195)
... 30 more
问题与文件中的 pom.xml有关(此处：https：//github.com/googleclecleclecloudplatform/pubsub/pubsub/blob/blob/master/kafka-connector/pom.xml(默认设置可用于linux-x86_64。我用${os.detected.classifier}替换linux-x86_64，一切正常。具体来说，我替换了：
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-tcnative-boringssl-static</artifactId>
<version>1.1.33.Fork14</version>
<classifier>linux-x86_64</classifier>
with：
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-tcnative-boringssl-static</artifactId>
<version>1.1.33.Fork14</version>
<classifier>${os.detected.classifier}/classifier>
在GoogleCloudPlatform/pubsub/kafka-connector/pom.xml中。