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From Aaron Morton <aa...@thelastpickle.com>
Subject Re: Error connection to remote JMX agent! on nodetool
Date Wed, 23 Mar 2011 18:32:15 GMT
What process are you using to confirm the data was replicated to another server ? And what
makes you say the data is not replicated ? I think your understanding of the replication may
be a little off, you rarely read from one node. Have a look at http://thelastpickle.com/2011/02/07/Introduction-to-Cassandra/

What happens when you try to create a keyspace or CF and it fails?

It's easier to help if you provide the commands you use and any error messages. Also remember
to check the logs on the servers for errors.

Aaron

On 24/03/2011, at 5:58 AM, "kondo@vivinavi.com" <kondo@vivinavi.com> wrote:

> Hi maki-san
> 
> I am so sorry this was my mistake.
> I expected when I set data at one node, the data should be copied to the other node
> at the same keyspace and same column family by replication.
> This replication was working.
> I just made a mistake to get data by wrong Key.(First character of key was lower-case
character
> but I thought first character was capitalized. I tried to get by key=User but key=user)
> I am so sorry for this confusion.
> So now I confirmed the data I set at **.**.254.53 was replicated to **.**.254.54.
> (At first I started 53 with autobootstrap=false then started 54 with autobootstrap=true
and then
> finally restarted 53 with autobootstrap=true. So 53 server is like a master)
> 
> However when I set data at 54 server, this data never been replicated.
> So this is Not bidirectional replication ?
> Cassandra at multi-node is ring (This means no master, no slave?).
> (Off course seeds in cassandra.yaml of both server are the same)
> So I expected I can replicate bidirectinally.
> Am I wrong?
> And when I run at multi-node, I can't create keyspace, column family on Cassandra-cli
at other 54 server
> (like a slave server).
> Is this normal?
> How can I create same keyspace and column family at multi-node?
> or I have to restart at single-node, then can I create same keyspace and column family?
> 
> Thank you for your help in advance.
> 
> Mamoru Mac Kondo
> 
> (2011/03/22 18:43), Maki Watanabe wrote:
>> How do you define your Keyspace?
>> As you may know, in Cassandra, replication (factor) is defined as the
>> attribute of Keyspace.
>> And what do you mean:
>>> However replication never happened.
>>> I can't get data I set at other node.
>> What did you do on cassandra, and what did you get in response?
>> 
>> maki
>> 
>> 
>> 2011/3/23 kondo@vivinavi.com<kondo@vivinavi.com>:
>>> Hi Sasha
>>> Thank you so much for your advice.
>>> I changed JMX_PORT from 10036 to 8080 in cassandra-env.sh.
>>> Now nodetool ring is working as following.
>>> 
>>> # nodetool --host **.**.254.54 ring
>>> Address         Status   State     Load            Owns        Token
>>> 
>>>           31247585259092561925693111230676487333
>>> **.**.254.53    Up     Normal  51.3 KB         84.50%
>>> 4871825541058236750403047111542070004
>>> **.**.254.54    Up     Normal  66.71 KB       15.50%
>>> 31247585259092561925693111230676487333
>>> 
>>> Then it seems I could set data to other node by Cassandra-cli --host other
>>> node IP --port 9160.(Currently only 2 nodes)
>>> However replication never happened.
>>> I can't get data I set at other node.
>>> I don't know what's wrong.
>>> (I thought replication starts when cassandra -p restart)
>>> Please advice me how to do to start replication.
>>> Thank you for your advice in advance.
>>> 
>>> 
>>> (2011/03/18 23:38), Sasha Dolgy wrote:
>>> 
>>> You need to specify the -jmxport with nodetool
>>> 
>>> On Mar 19, 2011 2:48 AM, "kondo@vivinavi.com"<kondo@vivinavi.com>  wrote:
>>>> Hi everyone
>>>> 
>>>> I am still new to Cassandra, Thrift.
>>>> But anyway Cassandra 0.7.4, Thrift 0.5.0 are working on java 1.6.0.18 of
>>>> Debian 5.0.7.at single node.
>>>> Then I had to try and check multi node on 2 servers.
>>>> (JVM_PORT=10036 on /etc/cassandra-env.sh)
>>>> I modified /etc/cassandra/cassandra.yaml as following.
>>>> auto_bootstrap:false ->true
>>>> seeds: -127.0.0.1 ->  add Global IP addres of 2 servers(incl.own server)
>>>> listen_address:localhost ->  Own Global IP address(or own host name on
>>>> /etc/hosts)
>>>> rpc_address:localhost ->0.0.0.0
>>>> I run master server and then slave server.
>>>> netstat -nl is as following. on both servers.
>>>> Proto Recv-Q Send-Q Local Address Foreign Address State
>>>> tcp 0 0 0.0.0.0:9160 0.0.0.0:* LISTEN
>>>> tcp 0 0 0.0.0.0:10036 0.0.0.0:* LISTEN
>>>> tcp 0 0 **.**.**.**:7000 0.0.0.0:* LISTEN
>>>> 
>>>> However it seems Cassandra doesn't work.
>>>> Because I can't get any data from Cluster (always null, data is broken?)
>>>> So I checked the nodetool (nodetool --host IP ring).
>>>> The nodetool had errors as following.
>>>> Error connection to remote JMX agent!
>>>> java.io.IOException: Failed to retrieve RMIServer stub:
>>>> javax.naming.ServiceUnavailableException [Root exception is
>>>> java.rmi.ConnectException: Connection refused to host: **.**.**.**;
>>>> nested exception is:
>>>> java.net.ConnectException: Connection refused]
>>>> 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:137)
>>>> at org.apache.cassandra.tools.NodeProbe.<init>(NodeProbe.java:107)
>>>> at org.apache.cassandra.tools.NodeCmd.main(NodeCmd.java:511)
>>>> Caused by: javax.naming.ServiceUnavailableException [Root exception is
>>>> java.rmi.ConnectException: Connection refused to host: **.**.**.**;
>>>> nested exception is:
>>>> java.net.ConnectException: Connection refused]
>>>> 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.ConnectException: Connection refused to host:
>>>> **.**.**.**; nested exception is:
>>>> java.net.ConnectException: Connection refused
>>>> at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619)
>>>> at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
>>>> 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.net.ConnectException: Connection refused
>>>> at java.net.PlainSocketImpl.socketConnect(Native Method)
>>>> at
>>>> 
>>>> java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:310)
>>>> at
>>>> 
>>>> java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:176)
>>>> at
>>>> java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:163)
>>>> at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384)
>>>> at java.net.Socket.connect(Socket.java:546)
>>>> at java.net.Socket.connect(Socket.java:495)
>>>> at java.net.Socket.<init>(Socket.java:392)
>>>> at java.net.Socket.<init>(Socket.java:206)
>>>> at
>>>> 
>>>> sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
>>>> at
>>>> 
>>>> sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:146)
>>>> at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
>>>> ... 14 more
>>>> 
>>>> I don't know how to do.
>>>> Please advise what am I wrong.
>>>> And please let me know how to delete or re-build cluster.
>>>> Because I can't even set data or make new column family currently on
>>>> Cassandra-Cli.
>>>> Thank you for your help in advance.
>>>> 
>>>> --
>>>> 
>>> **
> 
> 
> -- 
> *************************
> Mamoru Kondo
> Vivid Navigation,Inc.
> http://www.vivinavi.com
> kondo@vivinavi.com
> Office:310-326-2900
> Fax:310-257-0051
> *************************
> 

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