The document appears to be a presentation on optimizing inter-data center communication. It discusses key topics like what inter-data center communication involves, the costs associated with it, best practices for setting snitches, keyspaces, client drivers and consistency levels for queries to optimize performance between data centers. It recommends using network topology replication strategies over simple strategies for multi-region deployments, setting load balancing and consistency levels appropriately in clients, and enabling internode compression to reduce costs of communication between data centers. The presentation encourages reviewing client locations, data access patterns, who is reading/writing data, and having conversations between operations and development teams to determine the best use cases.

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How to Optimize
Inter-DC communication
Solution Architect, ScyllaDB
Eyal Gutkind

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Eyal Gutkind
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Head of Solution Architects team at ScyllaDB. Previously, held Product
Management roles at Mirantis and DataStax. Prior to DataStax I spent 12 years
with Mellanox Technologies in various engineering management and Product
Marketing roles. I have a BSc. degree in Electrical and Computer Engineering
from Ben Gurion University and an MBA from Fuqua School of Business at Duke
University

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What’s Inter-Datacenter Communication?
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USA Data Center Asia Data Center

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What Do You Pay for?
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What Do You Pay for?
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Snitch, Keyspace and Client Drivers Settings
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- Simple vs NetworkTopology Strategies
EC2MultiRegionSnitch - for AWS based deployments,
GossipingPropertyFileSnitch - for all other deployments

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Snitch, Keyspace and Client Drivers Settings
- Simple vs NetworkTopology Strategies
CREATE KEYSPACE myks WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '7'}
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USA Data Center Asia Data Center

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Snitch, Keyspace and Client Drivers Settings
- Simple vs NetworkTopology Strategies
CREATE KEYSPACE myks WITH replication = {'class': 'NetworkToplogyStrategy', 'usa’: '3', ‘asia’: ‘3’}
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USA Data Center Asia Data Center

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Snitch, Keyspace and Client Drivers Settings
- Simple vs NetworkTopology Strategies
- Be Local!
- Set Load balancing correctly in your clients
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load_balancing_policy=
TokenAwarePolicy(DCAwareRoundRobinPolicy(local_dc='asia'))

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Snitch, Keyspace and Client Drivers Settings
- Simple vs NetworkTopology Strategies
- Be Local!
- Set Load balancing correctly in your clients
- Set Consistency levels in your queries!
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insert_query = SimpleStatement( "INSERT INTO myks.mytable (user_id,
name, address, zip_code) VALUES (%s, %s, %s, %s)",
consistency_level=ConsistencyLevel.LOCAL_QUORUM)
…)

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First and last name
Position, company
Snitch, Keyspace and Client Drivers Settings
- Simple vs NetworkTopology Strategies
- Be Local!
- Set Load balancing correctly in your clients
- Set Consistency levels in your queries!
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Inter-Node Compression!
Default : None
Use: DC
In your Scylla.yaml file uncomment and set
internode_compression: dc
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Summary
- As expected, you always pay :)
- Create keyspaces and tables in the regions you need them
- Enable conversations between ops and dev for best use cases
- Review client geo locations and data access patterns
- Who is writing? (Cheap)
- Who is reading? (Expensive)
- Enable compression!
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THANK YOU
eyal@scylladb.com
@gutkinde
Please stay in touch
Any questions?