There and back again, ING’s Cassandra Tale

Datastax Summit 2016

Gary Stewart, @Gaz_GandAChristopher Reedijk, @creedijk

London, April 19, 2016

Market leaders Benelux

Growth markets

Commercial Banking

Challengers

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European map

Full-service bankVery strong European baseIT is something ING doesLargest bank of NL150+ Squads20+ use cases in production

Engineer / Architect Engineer / Chapter Lead

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a little bit about us

Gary Stewart Christopher Reedijk

#DataStaxSummit

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the contract … #DataStaxSummit

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an unexpected party #DataStaxSummit

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an unexpected journey #DataStaxSummit

Financial Fit

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#DataStaxSummit

the trolls of data modeling

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#DataStaxSummit

Think about the queries first!

Sometimes storing JSON in text is best

saved by …

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#DataStaxSummit

Lonely Planet

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the goblins of data querying #DataStaxSummit

Don’t do table scans

Think about Read pathi.e. avoid increasing sequential reads as data grows

Do performance tests even for small use-cases!

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saved by … #DataStaxSummit

iDeal

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the riddles of Gollum #DataStaxSummit

What could go wrong this time ….

NTP killed the happy flowCustomers couldn’t go to next page

the riddles of time

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#DataStaxSummit

NTP killed the happy flowCustomers couldn’t go to next page

Versioning to the rescue

saved by …

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#DataStaxSummit

Experiments API

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#DataStaxSummit

Aggressive distributedRead-after-Write, causing read-repair-blocking

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the spiders of 99 percentile #DataStaxSummit

Be careful with read-after-write

Always check the functionality of the framework you’re using

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saved by … #DataStaxSummit

Cached Data

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#DataStaxSummit

SizeTieredCompactionStrategy

Default, compact after 4 sstables

20GB data needs 100GB+ storage

the loss of storage

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SST1 SST1 SST2 SST1 SST2 SST3 SST1 SST2 SST3 SST4 SST5

FLUSHFLUSH

FLUSH FLUSH

COMPACT

#DataStaxSummit

Data space required is now around 50% less!

Attention to details can save i/o and disk space

saved by …

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SST1 SST1 SST2 SST3

FLUSHFLUSH

COMPACT

#DataStaxSummit

Fraud Investigation

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#DataStaxSummit

Bad performance and nodes dying constantly

Network and GC issuesHinted handoffs going crazyVery long GC-pauses causing nodes to freeze

Never ending compactions

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the wood elves of network #DataStaxSummit

Take a step back

Upgraded to 4.8.5with G1GC (default when using Java 8)4.7.3 is way too chatty

Increased heap and new to 16GB and 8GB

for coordinator nodes, which in our case are all

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saved by … #DataStaxSummit

Incoming Traffic

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the desolation of smaug #DataStaxSummit

Think top-down – queries first

Talk about failuresExperimentation – SandboxEnvironment that is safe to fail

Take a step backunderstand the architecture

flow of dataensure you are understanding the problem

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desolated by … #DataStaxSummit

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the battle of 5 armies #DataStaxSummit

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the battle of 5 armies #DataStaxSummit

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Each time we ventured out therewith new insights ready to take on new epic challenges

And each time we came backBit bruised but never broken More willing to shareAnd rolled out into PRD

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there and back … #DataStaxSummit

again and again and again …

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#DataStaxSummit

Thank you

christopher.reedijk@ing.nl@creedijk

gary.stewart@ing.nl@Gaz_GandA

visuals by Isabelle Hörl:www.isabellehorl.com | @IsabelleHorl

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