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From "Kenneth Brotman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14265) Add explanation of vNodes to online documentation
Date Thu, 01 Mar 2018 13:54:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16382020#comment-16382020
] 

Kenneth Brotman commented on CASSANDRA-14265:
---------------------------------------------

>From DataStax at [https://docs.datastax.com/en/dse/5.1/dse-admin/datastax_enterprise/config/configVnodesProduction.html]

 
h1. Enabling virtual nodes on an existing production cluster
You cannot directly convert a single-token nodes to a vnode. However, you can configure another
datacenter configured with vnodes already enabled and allow automatic distribution to the
existing data into the new nodes. This method has the least impact on performance.
h2. Procedure
 # [Add a new datacenter to the cluster|https://docs.datastax.com/en/dse/5.1/dse-admin/datastax_enterprise/operations/opsAddDCToCluster.html].
 # Once the new datacenter with vnodes enabled is up, switch your clients to use the new datacenter.
 # Run a full repair with [nodetool repair|https://docs.datastax.com/en/dse/5.1/dse-admin/datastax_enterprise/tools/nodetool/toolsRepair.html].
This step ensures that after you move the client to the new datacenter that any previous writes
are added to the new datacenter and that nothing else, such as hints, is dropped when you
remove the old datacenter.

 # Update your schema to no longer reference the old datacenter.
 # Remove the old datacenter from the cluster.
See [Decommissioning a datacenter|https://docs.datastax.com/en/dse/5.1/dse-admin/datastax_enterprise/operations/opsDecomissionDC.html].

> Add explanation of vNodes to online documentation
> -------------------------------------------------
>
>                 Key: CASSANDRA-14265
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14265
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Documentation and Website
>            Reporter: Kenneth Brotman
>            Priority: Major
>
> A lot of inquiries on the mailing list about how vNodes work and how to set configuration
properly.  We should add an explanation to the documentation.



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