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1
Tips and Tricks for
Apache Kafka™ Ops
Dustin Cote -- Customer Ops
2
What is Kafka?
Streaming Platform
Scalable, Distributed Log
3
Moving Data
Producers
Consumers
Connect
Streams
4
5 Categories of Ops
Configuring
Deploying
Maintaining
Monitoring
Debugging
Kafka Ops
5
Please input settings.
Configuring
Kafka
6
Retention
Disk space available?
SLA on consuming?
Keyed data? Cardinality?
What if I lose a disk?
7
Security
Start with plaintext
SSL and SASL? Choose one first
Console clients are great for testing
8
Kafka ≈ Database
Deploying
Kafka
9
Start easy
Do you know Docker well?
Do you know Kubernetes well?
If no, then don’t use them.
Cloud an option?
How do you run your database(s)?
10
● JMX access (metrics reporter?)
● Environment Variables
● Logging capacity
● Don’t forget ZooKeeper
● File descriptors
● Disk deployment style
One does not simply start Brokers
11
Updates and
Upgrades
Maintaining
Kafka
12
Rolling Upgrade Tips
Set protocols and message formats
Be explicit
Go slow, too fast and ISR sadness
Upgrade often, point releases in prod
13
Rebalancing
Lose/Add Broker
Throttle early, adjust later
Throttles don’t affect in sync replicas
Not sure? Batch the reassign
See Monitoring
14
Updating Configs
Brokers
● Lots of dynamic config options!
● Sync config across the cluster
Topics
● Overrides are your friend
● Topic level unclean leader election
15
What do you watch?
Monitoring
Kafka
16
Kafka Thread Model
Monitor all of these hops with JMX
Transparent way to see activity
Especially watch request queue size
Don’t blindly bump thread count
17
Log Cleaner/Others
Watch your log cleaner with JMX
Bytes In/Out just makes sense
Don’t need to dashboard everything
Alert don’t automate (at least at first)
18
Clients
batch sizes
failed-authentication-rate
io-ratio
io-wait-ratio
io-wait-time-ns-avg
19
When there’s
trouble..
Debugging
Kafka
20
Logs about the Log
Debugging? Head to the logs!
Defaults separates files reasonably
Splunk, ELK, etc.? filter by appender
Metadata files are important too
● controller.log -- written to by active controller
● state-change.log -- updates received from and sent to
controller
● server.log -- basic broker operations (segment rolls,
replica fetching, etc.)
● log-cleaner.log -- cleaner thread (related to compaction)
● kafka-authorizer.log -- secure connections only (set to
DEBUG if you want successful connections)
● kafka-request.log -- super verbose, will talk about more
● /var/lib/recovery-point-offset-checkpoint – last offset
flushed to disk
● /var/lib/cleaner-offset-checkpoint – offset up to which
the cleaner has cleaned (compacted topics only)
● /var/lib/replication-offset-checkpoint – last committed
offset
21
Request logging
kafka-request.log
All information about all requests
Verbose, not great for live debugging
Use when no other options for root
cause
Rogue clients, single request
slowdowns, etc.
22
ISR updates aren’t happening
Replication stopped for no reason
zkVersion log spam
rmr /controller
https://conferences.oreilly.com/strat
a/strata-ny-2018/public/schedule/det
ail/68957
Controller Issues
23
The Offsets Topic
● __consumer_offsets → Stores offsets and group metadata
● bin/kafka-run-class kafka.tools.DumpLogSegments --offsets-decoder
● offsets.retention.minutes default 1 day (7 days on 2.0)
● Growing huge? Check the log cleaner health
● High Memory Usage on Brokers? Offsets are cached
● High CPU Usage on Brokers? Make sure this topic isn’t huge
● Please replication factor 3
24
Restarting? Think
about it.
● Restarts in distributed systems
are tricky
● Have a reason
● Understand startup time
● Clean shutdowns, limited scope
25
26

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