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From Evan Weaver <ewea...@gmail.com>
Subject Re: one server or more servers?
Date Thu, 16 Jul 2009 04:23:26 GMT
Try with only one seed. Not every host has to be in the seeds.

Evan

On Wed, Jul 15, 2009 at 8:52 PM, <mobiledreamers@gmail.com> wrote:
> in Seeds
> can we specify domain name instead of ip address
> right now seeds is specifying ip address
>
> On Wed, Jul 15, 2009 at 4:49 PM, Evan Weaver <eweaver@gmail.com> wrote:
>>
>> I sometimes have to use 127.0.0.1, at least when ListenAddress is
>> blank (auto-discover). Dunno if that has changed.
>>
>> Looks like this if you're successful:
>>
>> $ bin/nodeprobe --host 10.224.17.13 ring
>> Token(124007023942663924846758258675932114665)  3 10.224.17.13  |<--|
>> Token(106858063638814585506848525974047690568)  3 10.224.17.19  |   ^
>> Token(141130545721235451315477340120224986045)  3 10.224.17.14  |-->|
>>
>> Evan
>>
>> On Wed, Jul 15, 2009 at 4:24 PM, Michael Greene<michael.greene@gmail.com>
>> wrote:
>> > The port you're looking for is typically 8080, but if you only specify
>> > the host and not the port it shoudl work just fine.
>> >
>> > bin/nodeprobe -host localhost
>> >
>> > Michael
>> >
>> > On Wed, Jul 15, 2009 at 6:18 PM, <mobiledreamers@gmail.com> wrote:
>> >> bin]$ ./nodeprobe -host localhost -port 8888
>> >> Error connecting to remote JMX agent!
>> >> java.io.IOException: Failed to retrieve RMIServer stub:
>> >> javax.naming.CommunicationException [Root exception is
>> >> java.rmi.ConnectIOException: error during JRMP connection
>> >> establishment;
>> >> nested exception is:
>> >>         java.io.EOFException]
>> >>         at
>> >> javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:342)
>> >>         at
>> >>
>> >> javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:267)
>> >>         at
>> >> org.apache.cassandra.tools.NodeProbe.connect(NodeProbe.java:149)
>> >>         at
>> >> org.apache.cassandra.tools.NodeProbe.<init>(NodeProbe.java:111)
>> >>         at
>> >> org.apache.cassandra.tools.NodeProbe.main(NodeProbe.java:470)
>> >> Caused by: javax.naming.CommunicationException [Root exception is
>> >> java.rmi.ConnectIOException: error during JRMP connection
>> >> establishment;
>> >> nested exception is:
>> >>         java.io.EOFException]
>> >>         at
>> >>
>> >> com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:118)
>> >>         at
>> >>
>> >> com.sun.jndi.toolkit.url.GenericURLContext.lookup(GenericURLContext.java:203)
>> >>         at javax.naming.InitialContext.lookup(InitialContext.java:409)
>> >>         at
>> >>
>> >> javax.management.remote.rmi.RMIConnector.findRMIServerJNDI(RMIConnector.java:1902)
>> >>         at
>> >>
>> >> javax.management.remote.rmi.RMIConnector.findRMIServer(RMIConnector.java:1871)
>> >>         at
>> >> javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:276)
>> >>         ... 4 more
>> >> Caused by: java.rmi.ConnectIOException: error during JRMP connection
>> >> establishment; nested exception is:
>> >>         java.io.EOFException
>> >>         at
>> >> sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:304)
>> >>         at
>> >> sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
>> >>         at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:340)
>> >>         at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
>> >>         at
>> >>
>> >> com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:114)
>> >>         ... 9 more
>> >> Caused by: java.io.EOFException
>> >>         at java.io.DataInputStream.readByte(DataInputStream.java:267)
>> >>         at
>> >> sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:246)
>> >>         ... 13 more
>> >>
>> >> On Wed, Jul 15, 2009 at 4:17 PM, <mobiledreamers@gmail.com> wrote:
>> >>>
>> >>> port 7002 doesnt trying nodeprobe
>> >>>
>> >>> On Wed, Jul 15, 2009 at 4:03 PM, Anthony Molinaro
>> >>> <anthonym@alumni.caltech.edu> wrote:
>> >>>>
>> >>>> Alternatively if you are using the 0.3 release you can point a
>> >>>> browser
>> >>>> at port 7002 of one of the boxes and should see all the nodes in
the
>> >>>> list.
>> >>>>
>> >>>> -Anthony
>> >>>>
>> >>>> On Wed, Jul 15, 2009 at 05:40:27PM -0500, Michael Greene wrote:
>> >>>> > You can use the nodeprobe utility in bin/ to contact each node
and
>> >>>> > make sure they see the same information.  Run it with no arguments
>> >>>> > to
>> >>>> > see the commands you can pass it.
>> >>>> >
>> >>>> > There is also an open issue at
>> >>>> > https://issues.apache.org/jira/browse/CASSANDRA-252 for making
this
>> >>>> > a
>> >>>> > little more automatic (instead of having to run nodeprobe on
each
>> >>>> > node
>> >>>> > and check the results by hand, you can just pass in all the
servers
>> >>>> > that you think should be able to see each other) but there's
no
>> >>>> > code
>> >>>> > for this yet.
>> >>>> >
>> >>>> > Michael
>> >>>> >
>> >>>> > On Wed, Jul 15, 2009 at 5:33 PM, <mobiledreamers@gmail.com>
wrote:
>> >>>> > > Mark and Jonathan
>> >>>> > > I have started cassandra on 4 servers with all 4 of them
as seeds
>> >>>> > > how do i know all 4 are now part of the datastore
>> >>>> > > are there ways to test this
>> >>>> > > thanks a lot
>> >>>> > >
>> >>>> > > On Tue, Jul 14, 2009 at 8:30 AM, Mark Robson <markxr@gmail.com>
>> >>>> > > wrote:
>> >>>> > >>
>> >>>> > >> 2009/7/14 <mobiledreamers@gmail.com>
>> >>>> > >>>
>> >>>> > >>> 1. If you only have 3 production servers, Cassandra
may not do
>> >>>> > >>> much
>> >>>> > >>> for
>> >>>> > >>> you. You will probably only care if you have lots
more servers.
>> >>>> > >>> 3
>> >>>> > >>> servers is
>> >>>> > >>> a reasonable minimum for a test / dev environment
>> >>>> > >>> At How many servers does cassandra start really
performing?
>> >>>> > >>> or how many servers is an ideal setup say for
a game 10?
>> >>>> > >>
>> >>>> > >> It can use any number, three is probably a reasonable
minimum, I
>> >>>> > >> don't
>> >>>> > >> know what the maximum is.
>> >>>> > >>
>> >>>> > >> If you have a small number of servers, there is probably
no
>> >>>> > >> reason
>> >>>> > >> to use
>> >>>> > >> Cassandra; you can more usefully use a conventional
database
>> >>>> > >> with
>> >>>> > >> replication or sharding.
>> >>>> > >>
>> >>>> > >> The reason you might want to use Cassandra is to scale
writes a
>> >>>> > >> lot,
>> >>>> > >> to
>> >>>> > >> levels you couldn't reach with more "conventional"
databases.
>> >>>> > >>
>> >>>> > >> In all likelihood, an application would use Cassandra
to store
>> >>>> > >> high-volume
>> >>>> > >> high-write data alongside a more conventional database
to store
>> >>>> > >> smaller,
>> >>>> > >> less frequently changing stuff.
>> >>>> > >>
>> >>>> > >> It appears to me that Cassandra 0.3 is only really
useful if
>> >>>> > >> running
>> >>>> > >> on a
>> >>>> > >> homogenous cluster of dedicated servers with reasonable
amounts
>> >>>> > >> of
>> >>>> > >> memory /
>> >>>> > >> storage (But not necessarily high spec servers of
CPU, IO speed
>> >>>> > >> or
>> >>>> > >> internal
>> >>>> > >> redundancy).
>> >>>> > >>
>> >>>> > >> Once the load balancing is implemented in 0.5 (according
to
>> >>>> > >> current
>> >>>> > >> plans)
>> >>>> > >> it will become more useful for heterogenous environments.
>> >>>> > >>
>> >>>> > >> Mark
>> >>>> > >
>> >>>> > >
>> >>>> > >
>> >>>> > > --
>> >>>> > > Bidegg worlds best auction site
>> >>>> > > http://bidegg.com
>> >>>> > >
>> >>>>
>> >>>> --
>> >>>>
>> >>>> ------------------------------------------------------------------------
>> >>>> Anthony Molinaro
>> >>>> <anthonym@alumni.caltech.edu>
>> >>>
>> >>>
>> >>>
>> >>> --
>> >>> Bidegg worlds best auction site
>> >>> http://bidegg.com
>> >>
>> >>
>> >>
>> >> --
>> >> Bidegg worlds best auction site
>> >> http://bidegg.com
>> >>
>> >
>>
>>
>>
>> --
>> Evan Weaver
>
>
>
> --
> Bidegg worlds best auction site
> http://bidegg.com
>



-- 
Evan Weaver

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