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https://issues.apache.org/jira/browse/CASSANDRA-17024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benedict Elliott Smith updated CASSANDRA-17024:
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Change Category: Semantic
Complexity: Normal
Fix Version/s: 4.x
Status: Open (was: Triage Needed)
> 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
> Priority: Normal
> Fix For: 4.x
>
>
> *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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