Benedict Elliott Smith created CASSANDRA-17024:
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Summary: Artificial Latency Injection
Key: CASSANDRA-17024
URL: https://issues.apache.org/jira/browse/CASSANDRA-17024
Project: Cassandra
Issue Type: New Feature
Components: Messaging/Internode
Reporter: Benedict Elliott Smith
Assignee: Benedict Elliott Smith
*Motivation*
Cassandra aims to enable user’s applications to continue to function in the
presence of major incidents. To support this clusters must support
high-availability topologies, i.e. at present at least 3 DCs at remote
distances from each other. Operators wanting to migrate clusters initially
created in topologies that do not support this capability, or to move from
LOCAL_X to (GLOBAL) X consistency levels, have no mechanism for determining the
viability of the strategy for their applications. This is particularly critical
for applications that use LWTs, for which the degradation may be unpredictable
due to contention effects.
*Goals*
Support cluster-wide latency injection for some subset of messages
User Impact
*User Impact*
Users will be able to specify the set of Verbs that should be affected, and
also which queries within their client-side application.
Clients will be supported by the introduction of new {{UNSAFE_DELAY_X}}
consistency levels that mark queries as suitable to experience additional
artificial latency.
Latency will be controlled by JMX properties specifying whether only
{{UNSAFE_DELAY_X}} operations are affected, alongside which verbs and the
length of the delay.
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