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From Jake Luciani <jak...@gmail.com>
Subject Re: Is there a way from a running Cassandra node to determine whether or not itself is "up"?
Date Thu, 16 Jun 2011 02:45:05 GMT
No force a node "down" you can use nodetool disablegossip

On Wed, Jun 15, 2011 at 6:42 PM, Suan Aik Yeo <yeosuanaik@gmail.com> wrote:

> Thanks, Aaron, but we determined that adding Java into the equation just
> brings in too much complexity for something that's called out of an Nginx
> Perl module. Right now I'm having trouble even replicating the above
> scenario and posted a question here:
> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Easy-way-to-overload-a-single-node-on-purpose-tt6480958.html
>
>
> - Suan
>
>
> On Thu, Jun 9, 2011 at 3:58 AM, aaron morton <aaron@thelastpickle.com>wrote:
>
>> None via thrift that I can recall, but the StorageService MBean exposes
>> getLiveNodes() this is what nodetool uses to see which nodes are live.
>>
>> From the code...
>>    /**
>>     * Retrieve the list of live nodes in the cluster, where "liveness" is
>>     * determined by the failure detector of the node being queried.
>>     *
>>     * @return set of IP addresses, as Strings
>>     */
>>    public List<String> getLiveNodes();
>>
>> Hope that helps.
>>
>> -----------------
>> Aaron Morton
>> Freelance Cassandra Developer
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 9 Jun 2011, at 17:56, Suan Aik Yeo wrote:
>>
>> > Is there a way (preferably an exposed method accessible through Thrift),
>> from a running Cassandra node to determine whether or not itself is "up"?
>> (Per Cassandra standards, I'm assuming based on the gossip protocol).
>> Another way to think of what I'm looking for is basically running "nodetool
>> ring" just on myself, but I'm only interested in knowing whether I'm "Up" or
>> "Down"?
>> >
>> > I'm currently using the "describe_cluster" method, but earlier today
>> when the commitlogs for a node filled up and it appeared down to the other
>> nodes, describe_cluster() still worked fine, thus failing the check.
>> >
>> > Thanks,
>> > Suan
>>
>>
>


-- 
http://twitter.com/tjake

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