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From "Hiroki Watanabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12555) Network-Emulator Function
Date Fri, 26 Aug 2016 02:22:20 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hiroki Watanabe updated CASSANDRA-12555:
----------------------------------------
    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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