[
https://issues.apache.org/jira/browse/CASSANDRA-14779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16672416#comment-16672416
]
Ian Cleasby commented on CASSANDRA-14779:
-----------------------------------------
Hey [~benedict],
I was looking through StorageProxy in regards to how the snitch could be set
through Storage Proxy over JMX and wasn't able to find any kind of setter.
Could you clarify where JMX could be doing this?
regards,
Ian
> Changing EndpointSnitch via JMX has problems
> --------------------------------------------
>
> Key: CASSANDRA-14779
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14779
> Project: Cassandra
> Issue Type: Bug
> Components: Distributed Metadata
> Reporter: Benedict
> Priority: Minor
> Fix For: 4.x
>
>
> The snitch can be set via StorageProxy over JMX, for what reason I’m unsure.
> If this were to happen, we might encounter the following problems:
> * If the effective local DC were to change, we would not update it. Perhaps
> changing the local DC of a node should be rejected and cause it to fail, but
> presently, it would simply result in our disagreeing with the snitch.
> * During the transition, routing of queries might be broken, as we fetch the
> snitch multiple times in different locations when deciding where to route our
> query and writes. It’s not clear what the outcome of a discordant view of
> the ring would be.
> Probably, changing this information in a live cluster is dangerous and we
> should actually reject any effective changes to rack, or DC for any node.
> But presently we don’t seem to corroborate that this information remains the
> same. We don’t seem to perform any cluster wide confirmation that this data
> is consistent, generally, which perhaps we should also consider.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
