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From Roman Naumenko <ro...@sproutling.com>
Subject Re: Service discovery in the Cassandra cluster
Date Mon, 01 May 2017 23:37:22 GMT
Well, I guess I have to figure out what’s up with IPs/hostnames by experiment.
Information about service discovery is practically absent.
Not to mention all important details about fqdns/hostnames, automatic replacing seed nodes
or what not. 

—
Roman

> On May 1, 2017, at 4:14 PM, Jon Haddad <jonathan.haddad@gmail.com> wrote:
> 
> The in-tree docs do not mention this anywhere, and even have some of the answers you’re
asking:
> 
> https://cassandra.apache.org/doc/latest/faq/index.html?highlight=seed#what-are-seeds
<https://cassandra.apache.org/doc/latest/faq/index.html?highlight=seed#what-are-seeds>
> 
> The DataStax docs are maintained outside of the project, you’ll have to ask them why
they’re wrong or misleading.
> 
> Jon
> 
>> On May 1, 2017, at 4:10 PM, Roman Naumenko <roman@sproutling.com <mailto:roman@sproutling.com>>
wrote:
>> 
>> The docs mention IP addresses everywhere.
>> 
>> http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/operations/ops_replace_seed_node.html
<http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/operations/ops_replace_seed_node.html>
>> Promote an existing node to a seed node by adding its IP address to -seeds list and
remove (demote) the IP address of the dead seed node from the cassandra.yaml file for each
node in the cluster.
>> 
>> http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/operations/ops_replace_node_t.html
<http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/operations/ops_replace_node_t.html>
>> Note the Address of the dead node; it is used in step 5.
>> 
>> http://docs.datastax.com/en/cassandra/2.1/cassandra/initialize/initializeSingleDS.html
<http://docs.datastax.com/en/cassandra/2.1/cassandra/initialize/initializeSingleDS.html>
>>> Properties to set:
>>> num_tokens: recommended value: 256
>>> -seeds: internal IP address of each seed node
>> 
>> I saw also hostnames mentioned few times, but it just makes it even more confusing.
>> 
>> —
>> Roman
>> 
>>> On May 1, 2017, at 3:50 PM, Jon Haddad <jonathan.haddad@gmail.com <mailto:jonathan.haddad@gmail.com>>
wrote:
>>> 
>>> Sure, you could use DNS.  Where does it say IP addresses are a requirement?
>>> 
>>>> On May 1, 2017, at 1:36 PM, Roman Naumenko <roman@sproutling.com <mailto:roman@sproutling.com>>
wrote:
>>>> 
>>>> If I understand how Cassandra nodes work, they must contain a list of seed’s
IP addressed in config file.
>>>> 
>>>> This requirement makes cluster setup unnecessarily complicated. Is it possible
to use DNS name for seed nodes?
>>>> 
>>>> Thanks,
>>>> 
>>>> —
>>>> Roman
>>>> ---------------------------------------------------------------------
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>>>> 
>>> 
>> 
> 


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