cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Suan Aik Yeo <yeosuan...@gmail.com>
Subject Re: Is there a way from a running Cassandra node to determine whether or not itself is "up"?
Date Wed, 15 Jun 2011 22:42:32 GMT
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
>
>

Mime
View raw message