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From "Jason Gustafson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6260) AbstractCoordinator not clearly handles NULL Exception
Date Wed, 29 Nov 2017 18:09:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16271269#comment-16271269
] 

Jason Gustafson commented on KAFKA-6260:
----------------------------------------

I think I may have spotted a possible cause. Interestingly, the NPE is hit when we process
selection keys from the locally maintained {{keysWithBufferedRead}} set. As far as I can tell,
a socket could still be present in this set when a connection is closed, and we do not remove
it from that set explicitly. When we call {{poll}} again, the key would still be present,
but we would have removed the attached channel, which would trigger the NPE.

> 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
>
> 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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