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From "Hiroki Watanabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12555) Network-Emulator Function
Date Fri, 26 Aug 2016 02:21:20 GMT

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

Hiroki Watanabe updated CASSANDRA-12555:
----------------------------------------
    Description: 
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?

  was:
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 eth0 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 eth0
{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?


> 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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