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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-14409) Transient Replication: Support ring changes when transient replication is in use (add/remove node, change RF, add/remove DC)
Date Sat, 01 Sep 2018 01:46:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-14409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ariel Weisberg updated CASSANDRA-14409:
---------------------------------------
    Status: Ready to Commit  (was: Patch Available)

> Transient Replication: Support ring changes when transient replication is in use (add/remove
node, change RF, add/remove DC)
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-14409
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14409
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Coordination, Core, Documentation and Website
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>            Priority: Major
>             Fix For: 4.0
>
>
> The additional state transitions that transient replication introduces require streaming
and nodetool cleanup to behave differently. We already have code that does the streaming,
but in some cases we shouldn't stream any data and in others when we stream to receive data
we have to make sure we stream from a full replica and not a transient replica.
> Transitioning from not replicated to transiently replicated means that a node must stay
pending until the next incremental repair completes at which point the data for that range
is known to be available at full replicas.
> Transitioning from transiently replicated to fully replicated requires streaming from
a full replica and is identical to how we stream from not replicated to replicated. The transition
must be managed so the transient replica is not read from as a full replica until streaming
completes. It can be used immediately for a write quorum.
> Transitioning from fully replicated to transiently replicated requires cleanup to remove
repaired data from the transiently replicated range to reclaim space. It can be used immediately
for a write quorum.
> Transitioning from transiently replicated to not replicated requires cleanup to be run
to remove the formerly transiently replicated data.
> nodetool move, removenode, cleanup, decommission, and rebuild need to handle these issues
as does bootstrap.
> Update web site, documentation, NEWS.txt with a description of the steps for doing common
operations. Add/remove DC, Add/remove node(s), replace node, change RF.



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