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https://issues.apache.org/jira/browse/KAFKA-6260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16271393#comment-16271393
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Guozhang Wang commented on KAFKA-6260:
--------------------------------------
Ack, thanks!!
> AbstractCoordinator not clearly handles NULL Exception
> ------------------------------------------------------
>
> Key: KAFKA-6260
> URL: https://issues.apache.org/jira/browse/KAFKA-6260
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 1.0.0
> Environment: RedHat Linux
> Reporter: Seweryn Habdank-Wojewodzki
> Assignee: Jason Gustafson
>
> The error reporting is not clear. But it seems that Kafka Heartbeat shuts
> down application due to NULL exception caused by "fake" disconnections.
> One more comment. We are processing messages in the stream, but sometimes we
> have to block processing for minutes, as consumers are not handling too much
> load. Is it possibble that when stream is waiting, then heartbeat is as well
> blocked?
> Can you check that?
> {code}
> 2017-11-23 23:54:47 DEBUG AbstractCoordinator:177 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Received successful Heartbeat response
> 2017-11-23 23:54:50 DEBUG AbstractCoordinator:183 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Sending Heartbeat request to coordinator
> cljp01.eb.lan.at:9093 (id: 2147483646 rack: null)
> 2017-11-23 23:54:50 TRACE NetworkClient:135 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Sending HEARTBEAT
> {group_id=kafka-endpoint,generation_id=3834,member_id=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer-94f18be5-e49a-4817-9e5a-fe82a64e0b08}
> with correlation id 24 to node 2147483646
> 2017-11-23 23:54:50 TRACE NetworkClient:135 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Completed receive from node 2147483646 for HEARTBEAT
> with correlation id 24, received {throttle_time_ms=0,error_code=0}
> 2017-11-23 23:54:50 DEBUG AbstractCoordinator:177 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Received successful Heartbeat response
> 2017-11-23 23:54:52 DEBUG NetworkClient:183 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Disconnecting from node 1 due to request timeout.
> 2017-11-23 23:54:52 TRACE NetworkClient:135 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Cancelled request
> {replica_id=-1,max_wait_time=6000,min_bytes=1,max_bytes=52428800,isolation_level=0,topics=[{topic=clj_internal_topic,partitions=[{partition=6,fetch_offset=211558395,log_start_offset=-1,max_bytes=1048576},{partition=8,fetch_offset=210178209,log_start_offset=-1,max_bytes=1048576},{partition=0,fetch_offset=209353523,log_start_offset=-1,max_bytes=1048576},{partition=2,fetch_offset=209291462,log_start_offset=-1,max_bytes=1048576},{partition=4,fetch_offset=210728595,log_start_offset=-1,max_bytes=1048576}]}]}
> with correlation id 21 due to node 1 being disconnected
> 2017-11-23 23:54:52 DEBUG ConsumerNetworkClient:195 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Cancelled FETCH request RequestHeader(apiKey=FETCH,
> apiVersion=6,
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> correlationId=21) with correlation id 21 due to node 1 being disconnected
> 2017-11-23 23:54:52 DEBUG Fetcher:195 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Fetch request
> {clj_internal_topic-6=(offset=211558395, logStartOffset=-1,
> maxBytes=1048576), clj_internal_topic-8=(offset=210178209, logStartOffset=-1,
> maxBytes=1048576), clj_internal_topic-0=(offset=209353523, logStartOffset=-1,
> maxBytes=1048576), clj_internal_topic-2=(offset=209291462, logStartOffset=-1,
> maxBytes=1048576), clj_internal_topic-4=(offset=210728595, logStartOffset=-1,
> maxBytes=1048576)} to cljp01.eb.lan.at:9093 (id: 1 rack: DC-1) failed
> org.apache.kafka.common.errors.DisconnectException: null
> 2017-11-23 23:54:52 TRACE NetworkClient:123 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Found least loaded node cljp01.eb.lan.at:9093 (id: 1
> rack: DC-1)
> 2017-11-23 23:54:52 DEBUG NetworkClient:183 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Initialize connection to node cljp01.eb.lan.at:9093
> (id: 1 rack: DC-1) for sending metadata request
> 2017-11-23 23:54:52 DEBUG NetworkClient:183 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Initiating connection to node cljp01.eb.lan.at:9093
> (id: 1 rack: DC-1)
> 2017-11-23 23:54:52 ERROR AbstractCoordinator:296 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Heartbeat thread for group kafka-endpoint failed due
> to unexpected error
> java.lang.NullPointerException: null
> at
> org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:436)
> ~[my-kafka-endpoint.jar:?]
> at org.apache.kafka.common.network.Selector.poll(Selector.java:395)
> ~[my-kafka-endpoint.jar:?]
> at
> org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:460)
> ~[my-kafka-endpoint.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:238)
> ~[my-kafka-endpoint.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.pollNoWakeup(ConsumerNetworkClient.java:275)
> ~[my-kafka-endpoint.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator$HeartbeatThread.run(AbstractCoordinator.java:934)
> [my-kafka-endpoint.jar:?]
> 2017-11-23 23:54:52 DEBUG AbstractCoordinator:177 - [Consumer
> clientId=kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer,
> groupId=kafka-endpoint] Heartbeat thread has closed
> 2017-11-23 23:55:16 INFO KafkaElasticsearchEndpoint:61 - Got shutdown
> requests ...
> 2017-11-23 23:55:16 INFO StreamProcessor:106 - Streams closing ...
> 2017-11-23 23:55:16 INFO StreamProcessor:111 - with 5 [s] timeout
> 2017-11-23 23:55:16 DEBUG KafkaStreams:183 - stream-client
> [kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31]Stopping Streams client
> with timeoutMillis = 5000 ms.
> 2017-11-23 23:55:16 INFO KafkaStreams:346 - stream-client
> [kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31]State transition from
> RUNNING to PENDING_SHUTDOWN
> 2017-11-23 23:55:16 INFO StreamThread:336 - stream-thread
> [kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1] Informed
> to shut down
> 2017-11-23 23:55:16 INFO StreamThread:346 - stream-thread
> [kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1] State
> transition from RUNNING to PENDING_SHUTDOWN
> {code}
> Kafka settings:
> {code}
> auto.commit.interval.ms = 5000
> auto.offset.reset = earliest
> bootstrap.servers = [xxx:9093, yyy:9093]
> check.crcs = true
> client.id =
> kafka-endpoint-be51569b-8795-4709-8ec8-28c9cd099a31-StreamThread-1-consumer
> connections.max.idle.ms = 540000
> enable.auto.commit = false
> exclude.internal.topics = true
> fetch.max.bytes = 52428800
> fetch.max.wait.ms = 6000
> fetch.min.bytes = 1
> group.id = kafka-endpoint
> heartbeat.interval.ms = 3000
> interceptor.classes = null
> internal.leave.group.on.close = false
> isolation.level = read_uncommitted
> key.deserializer = class
> org.apache.kafka.common.serialization.ByteArrayDeserializer
> max.partition.fetch.bytes = 1048576
> max.poll.interval.ms = 10000000
> max.poll.records = 2000
> metadata.max.age.ms = 300000
> metric.reporters = []
> metrics.num.samples = 2
> metrics.recording.level = INFO
> metrics.sample.window.ms = 30000
> partition.assignment.strategy =
> [org.apache.kafka.streams.processor.internals.StreamPartitionAssignor]
> receive.buffer.bytes = 65536
> reconnect.backoff.max.ms = 1000
> reconnect.backoff.ms = 50
> request.timeout.ms = 7000
> 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 = SSL
> send.buffer.bytes = 131072
> session.timeout.ms = 6000
> ssl.cipher.suites = null
> ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
> ssl.endpoint.identification.algorithm = null
> ssl.key.password = [hidden]
> ssl.keymanager.algorithm = SunX509
> ssl.keystore.location = /data/my/etc/kafka/client-keystore
> ssl.keystore.password = [hidden]
> ssl.keystore.type = JKS
> ssl.protocol = TLS
> ssl.provider = null
> ssl.secure.random.implementation = SHA1PRNG
> ssl.trustmanager.algorithm = PKIX
> ssl.truststore.location = /data/my/etc/kafka/truststore
> ssl.truststore.password = [hidden]
> ssl.truststore.type = JKS
> value.deserializer = class
> org.apache.kafka.common.serialization.ByteArrayDeserializer
> {code}
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