频繁的“偏移超出范围”消息，消费者遗弃的分区

Question

我们正在运行 3 节点 Kafka 0.10.0.1 集群。我们有一个消费者应用程序，它有一个连接到多个主题的消费者组。我们在消费者日志中看到了奇怪的行为。用这些线

 Fetch offset 1109143 is out of range for partition email-4, resetting offset
 Fetch offset 952168 is out of range for partition email-7, resetting offset
 Fetch offset 945796 is out of range for partition email-5, resetting offset
 Fetch offset 950900 is out of range for partition email-0, resetting offset
 Fetch offset 953163 is out of range for partition email-3, resetting offset
 Fetch offset 1118389 is out of range for partition email-6, resetting offset
 Fetch offset 1112177 is out of range for partition email-2, resetting offset
 Fetch offset 1109539 is out of range for partition email-1, resetting offset

一段时间后我们看到了这些日志

[2018-06-08 19:45:28] :: INFO  :: ConsumerCoordinator:333 - Revoking previously assigned partitions [sms-4, sms-3, sms-0, sms-2, sms-1] for group notifications-consumer
[2018-06-08 19:45:28] :: INFO  :: AbstractCoordinator:381 - (Re-)joining group notifications-consumer
[2018-06-08 19:45:28] :: INFO  :: AbstractCoordinator$1:349 - Successfully joined group notifications-consumer with generation 3063
[2018-06-08 19:45:28] :: INFO  :: AbstractCoordinator$1:349 - Successfully joined group notifications-consumer with generation 3063
[2018-06-08 19:45:28] :: INFO  :: AbstractCoordinator$1:349 - Successfully joined group notifications-consumer with generation 3063
[2018-06-08 19:45:28] :: INFO  :: AbstractCoordinator$1:349 - Successfully joined group notifications-consumer with generation 3063
[2018-06-08 19:45:28] :: INFO  :: AbstractCoordinator$1:349 - Successfully joined group notifications-consumer with generation 3063
[2018-06-08 19:45:28] :: INFO  :: AbstractCoordinator$1:349 - Successfully joined group notifications-consumer with generation 3063
[2018-06-08 19:45:28] :: INFO  :: AbstractCoordinator$1:349 - Successfully joined group notifications-consumer with generation 3063
[2018-06-08 19:45:28] :: INFO  :: AbstractCoordinator$1:349 - Successfully joined group notifications-consumer with generation 3063
[2018-06-08 19:45:28] :: INFO  :: ConsumerCoordinator:225 - Setting newly assigned partitions [sms-8, sms-7, sms-9, sms-6, sms-5] for group notifications-consumer

我注意到在设置新分配的分区列表中没有看到我们的主题之一。然后，该主题至少在 8 小时内没有附加消费者。只有当有人重新启动应用程序时，它才开始从该主题消费。这里可能出了什么问题？

这里是消费者配置

auto.commit.interval.ms = 3000
auto.offset.reset = latest
bootstrap.servers = [x.x.x.x:9092, x.x.x.x:9092, x.x.x.x:9092]
check.crcs = true
client.id =
connections.max.idle.ms = 540000
enable.auto.commit = true
exclude.internal.topics = true
fetch.max.bytes = 52428800
fetch.max.wait.ms = 500
fetch.min.bytes = 1
group.id = otp-notifications-consumer
heartbeat.interval.ms = 3000
interceptor.classes = null
key.deserializer = class org.apache.kafka.common.serialization.StringDeserializer
max.partition.fetch.bytes = 1048576
max.poll.interval.ms = 300000
max.poll.records = 50
metadata.max.age.ms = 300000
metric.reporters = []
metrics.num.samples = 2
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.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 = SSL
send.buffer.bytes = 131072
session.timeout.ms = 300000
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 = /x/x/client.truststore.jks
ssl.truststore.password = [hidden]
ssl.truststore.type = JKS
value.deserializer = class org.apache.kafka.common.serialization.StringDeserializer

成为孤儿的主题有 10 个分区，retention.ms=1800000，segment.ms=1800000。 请帮忙。

Answer 1

您看到的偏移超出范围消息通常表示消费者所在的偏移量已在代理上被删除。一旦点击，消费者将使用auto.offset.reset 重新开始消费。

使用retention.ms=1800000（30 分钟），您只能将数据保留很短的时间，因此预计如果您在几个小时后重新启动消费者，数据就会消失。