[jira] Resolved: (CASSANDRA-768) "safe mode" for nodes so that they do not participate in reads until hinted handoff is complete

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-768?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis resolved CASSANDRA-768.
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    Resolution: Not A Problem

there is no way to know if hinted handoff is complete.  HH is just an optimization to reduce inconsistency window; trying to make it more than that is asking for trouble.  (what if a node w/ HH data goes down mid-transfer?  do you wait indefinitely? if you do then you can screw yourself on availability; if you don't, then what have you solved?)

> "safe mode" for nodes so that they do not participate in reads until hinted handoff is complete
> -----------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-768
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-768
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Robert Coli
>            Priority: Minor
>
> Summary :
> When using ConsistencyLevel.ONE for read performance reasons, stale data can be served by a node which has been temporarily unavailable. When a node has been unavailable for some time and other nodes have queued updates for it via hinted handoff, it would be operationally useful to be able to configure the node to not participate in read traffic until the hinted handoff process is complete. A "safe mode" would offer operators a greater consistency guarantee across all nodes without the per-read performance tradeoff of a higher ConsistencyLevel. This "safe mode" concept might also be applicable to nodes undergoing "repair" processes, for example in the case of on-disk data corruption or loss.

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