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https://issues.apache.org/jira/browse/CASSANDRA-12555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hiroki Watanabe updated CASSANDRA-12555:
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Status: Awaiting Feedback (was: Open)
> Network-Emulator Function
> -------------------------
>
> Key: CASSANDRA-12555
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12555
> Project: Cassandra
> Issue Type: Wish
> Components: Tools
> Reporter: Hiroki Watanabe
> Priority: Minor
>
> If we can use network-emulator function in Cassandra, it greatly helps us
> have some experiments assumed as real environment.
> For example, we can simulate the following situation in localhost with CCM or
> in your machine rack at hand:
> {quote}
> a Cluster consists of DC1 and DC2
> DC1 is spatially far from DC2 (some network delay exists)
> nodeA in DC1 and nodeB in DC2 are connected as follows
> (nodeA:eth0) === (eth1:nodeB)
> {quote}
> \\
> We design a simple usage like Linux tc command as follows.
> {quote}
> $ bin/nodetool netem CMD PROPERTY I/F VALUE
> {quote}
> If we realize 20ms RTT between DC1 and DC2, we execute the next command:
> {quote}
> (nodeA) $ bin/nodetool netem add delay eth0 10ms
> (nodeB) $ bin/nodetool netem add delay eth1 10ms
> {quote}
> If we want to change RTT into 10ms, we execute the next command:
> {quote}
> (nodeA) $ bin/nodetool netem change delay eth0 5ms
> (nodeB) $ bin/nodetool netem change delay eth1 5ms
> {quote}
> If we want to disable network-emulator function, we execute the next command:
> {quote}
> (nodeA) $ bin/nodetool netem del delay eth0
> (nodeB) $ bin/nodetool netem del delay eth1
> {quote}
> In this design, we can implement other PROPERTYs in the future such as
> bandwidth.
> \\
> We think this function helps many people develop Cassandra!
> Thank you for reading this, and what do you think about this function?
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