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From "Matthieu Morel (JIRA)" <>
Subject [jira] [Commented] (S4-99) Provide injectable load shedding mechanism
Date Wed, 09 Jan 2013 11:50:12 GMT


Matthieu Morel commented on S4-99:

S4-95 provides pluggable stream executors as well as event senders. These are good places
for specifying custom load shedding strategies.
> Provide injectable load shedding mechanism
> ------------------------------------------
>                 Key: S4-99
>                 URL:
>             Project: Apache S4
>          Issue Type: Improvement
>            Reporter: Matthieu Morel
> The main queues in S4 are the NIO buffer and the Stream event queue. The stream event
queue is a good place for implementing various load shedding strategies, because metadata
is available from the EventMessage class.
> Currently, the default mechanism is avoid load shedding by using a blocking write operation
on the stream queue. We already experiment alternatives (see S4-62), but the best way would
be a pluggable mechanism.

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