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From "Mikhail Khomenko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-7417) Some replicas cannot become in-sync
Date Mon, 17 Sep 2018 19:34:00 GMT
Mikhail Khomenko created KAFKA-7417:
---------------------------------------

             Summary: Some replicas cannot become in-sync
                 Key: KAFKA-7417
                 URL: https://issues.apache.org/jira/browse/KAFKA-7417
             Project: Kafka
          Issue Type: Bug
          Components: replication
    Affects Versions: 2.0.0
            Reporter: Mikhail Khomenko


Hi,
we have faced with the next issue - some replicas cannot become in-sync. Distribution of in-sync
replicas amongst topics is random. For instance:
{code:java}
$ kafka-topics --zookeeper 1.2.3.4:8181 --describe --topic TEST
Topic:TEST PartitionCount:8 ReplicationFactor:3 Configs:
Topic: TEST Partition: 0 Leader: 2 Replicas: 0,2,1 Isr: 0,1,2
Topic: TEST Partition: 1 Leader: 1 Replicas: 1,0,2 Isr: 0,1,2
Topic: TEST Partition: 2 Leader: 2 Replicas: 2,1,0 Isr: 0,1,2
Topic: TEST Partition: 3 Leader: 2 Replicas: 0,1,2 Isr: 0,1,2
Topic: TEST Partition: 4 Leader: 1 Replicas: 1,2,0 Isr: 0,1,2
Topic: TEST Partition: 5 Leader: 2 Replicas: 2,0,1 Isr: 0,1,2
Topic: TEST Partition: 6 Leader: 0 Replicas: 0,2,1 Isr: 0,1,2
Topic: TEST Partition: 7 Leader: 0 Replicas: 1,0,2 Isr: 0,2{code}
Files in segment TEST-7 are equal (the same md5sum) on all 3 brokers. Also were checked by
kafka.tools.DumpLogSegments - messages are the same.


We have 3-broker cluster configuration with Confluent Kafka 5.0.0 (it's Apache Kafka 2.0.0).
Each broker has the next configuration:
{code:java}
advertised.host.name = null
advertised.listeners = PLAINTEXT://1.2.3.4:9200
advertised.port = null
alter.config.policy.class.name = null
alter.log.dirs.replication.quota.window.num = 11
alter.log.dirs.replication.quota.window.size.seconds = 1
authorizer.class.name = 
auto.create.topics.enable = true
auto.leader.rebalance.enable = true
background.threads = 10
broker.id = 1
broker.id.generation.enable = true
broker.interceptor.class = class org.apache.kafka.server.interceptor.DefaultBrokerInterceptor
broker.rack = null
client.quota.callback.class = null
compression.type = producer
connections.max.idle.ms = 600000
controlled.shutdown.enable = true
controlled.shutdown.max.retries = 3
controlled.shutdown.retry.backoff.ms = 5000
controller.socket.timeout.ms = 30000
create.topic.policy.class.name = null
default.replication.factor = 3
delegation.token.expiry.check.interval.ms = 3600000
delegation.token.expiry.time.ms = 86400000
delegation.token.master.key = null
delegation.token.max.lifetime.ms = 604800000
delete.records.purgatory.purge.interval.requests = 1
delete.topic.enable = true
fetch.purgatory.purge.interval.requests = 1000
group.initial.rebalance.delay.ms = 3000
group.max.session.timeout.ms = 300000
group.min.session.timeout.ms = 6000
host.name = 
inter.broker.listener.name = null
inter.broker.protocol.version = 2.0
leader.imbalance.check.interval.seconds = 300
leader.imbalance.per.broker.percentage = 10
listener.security.protocol.map = PLAINTEXT:PLAINTEXT,SSL:SSL,SASL_PLAINTEXT:SASL_PLAINTEXT,SASL_SSL:SASL_SSL
listeners = PLAINTEXT://0.0.0.0:9200
log.cleaner.backoff.ms = 15000
log.cleaner.dedupe.buffer.size = 134217728
log.cleaner.delete.retention.ms = 86400000
log.cleaner.enable = true
log.cleaner.io.buffer.load.factor = 0.9
log.cleaner.io.buffer.size = 524288
log.cleaner.io.max.bytes.per.second = 1.7976931348623157E308
log.cleaner.min.cleanable.ratio = 0.5
log.cleaner.min.compaction.lag.ms = 0
log.cleaner.threads = 1
log.cleanup.policy = [delete]
log.dir = /tmp/kafka-logs
log.dirs = /var/lib/kafka/data
log.flush.interval.messages = 9223372036854775807
log.flush.interval.ms = null
log.flush.offset.checkpoint.interval.ms = 60000
log.flush.scheduler.interval.ms = 9223372036854775807
log.flush.start.offset.checkpoint.interval.ms = 60000
log.index.interval.bytes = 4096
log.index.size.max.bytes = 10485760
log.message.downconversion.enable = true
log.message.format.version = 2.0
log.message.timestamp.difference.max.ms = 9223372036854775807
log.message.timestamp.type = CreateTime
log.preallocate = false
log.retention.bytes = -1
log.retention.check.interval.ms = 300000
log.retention.hours = 8760
log.retention.minutes = null
log.retention.ms = null
log.roll.hours = 168
log.roll.jitter.hours = 0
log.roll.jitter.ms = null
log.roll.ms = null
log.segment.bytes = 1073741824
log.segment.delete.delay.ms = 60000
max.connections.per.ip = 2147483647
max.connections.per.ip.overrides = 
max.incremental.fetch.session.cache.slots = 1000
message.max.bytes = 1000012
metric.reporters = []
metrics.num.samples = 2
metrics.recording.level = INFO
metrics.sample.window.ms = 30000
min.insync.replicas = 2
num.io.threads = 8
num.network.threads = 8
num.partitions = 8
num.recovery.threads.per.data.dir = 1
num.replica.alter.log.dirs.threads = null
num.replica.fetchers = 4
offset.metadata.max.bytes = 4096
offsets.commit.required.acks = -1
offsets.commit.timeout.ms = 5000
offsets.load.buffer.size = 5242880
offsets.retention.check.interval.ms = 600000
offsets.retention.minutes = 525600
offsets.topic.compression.codec = 0
offsets.topic.num.partitions = 50
offsets.topic.replication.factor = 3
offsets.topic.segment.bytes = 104857600
password.encoder.cipher.algorithm = AES/CBC/PKCS5Padding
password.encoder.iterations = 4096
password.encoder.key.length = 128
password.encoder.keyfactory.algorithm = null
password.encoder.old.secret = null
password.encoder.secret = null
port = 9092
principal.builder.class = null
producer.purgatory.purge.interval.requests = 1000
queued.max.request.bytes = -1
queued.max.requests = 500
quota.consumer.default = 9223372036854775807
quota.producer.default = 9223372036854775807
quota.window.num = 11
quota.window.size.seconds = 1
replica.fetch.backoff.ms = 1000
replica.fetch.max.bytes = 1048576
replica.fetch.min.bytes = 1
replica.fetch.response.max.bytes = 10485760
replica.fetch.wait.max.ms = 5000
replica.high.watermark.checkpoint.interval.ms = 5000
replica.lag.time.max.ms = 30000
replica.socket.receive.buffer.bytes = 65536
replica.socket.timeout.ms = 30000
replication.quota.window.num = 11
replication.quota.window.size.seconds = 1
request.timeout.ms = 30000
reserved.broker.max.id = 1000
sasl.client.callback.handler.class = null
sasl.enabled.mechanisms = [GSSAPI]
sasl.jaas.config = null
sasl.kerberos.kinit.cmd = /usr/bin/kinit
sasl.kerberos.min.time.before.relogin = 60000
sasl.kerberos.principal.to.local.rules = [DEFAULT]
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.inter.broker.protocol = GSSAPI
sasl.server.callback.handler.class = null
security.inter.broker.protocol = PLAINTEXT
socket.receive.buffer.bytes = 102400
socket.request.max.bytes = 104857600
socket.send.buffer.bytes = 102400
ssl.cipher.suites = []
ssl.client.auth = none
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
transaction.abort.timed.out.transaction.cleanup.interval.ms = 60000
transaction.max.timeout.ms = 900000
transaction.remove.expired.transaction.cleanup.interval.ms = 3600000
transaction.state.log.load.buffer.size = 5242880
transaction.state.log.min.isr = 2
transaction.state.log.num.partitions = 50
transaction.state.log.replication.factor = 3
transaction.state.log.segment.bytes = 104857600
transactional.id.expiration.ms = 604800000
unclean.leader.election.enable = false
zookeeper.connect = 1.2.3.4:8181,1.2.3.5:8181,1.2.3.6:8181
zookeeper.connection.timeout.ms = null
zookeeper.max.in.flight.requests = 10
zookeeper.session.timeout.ms = 60000
zookeeper.set.acl = false
zookeeper.sync.time.ms = 2000{code}
Unfortunately, cannot exactly point the moment after that this happened. Any ideas how to
fix it (excluding restarts of brokers)?

Many thanks in advance!



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