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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (CASSANDRA-768) "safe mode" for nodes so that they do not participate in reads until hinted handoff is complete
Date Fri, 05 Feb 2010 20:12:28 GMT

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

Jonathan Ellis resolved CASSANDRA-768.
--------------------------------------

    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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