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https://issues.apache.org/jira/browse/CASSANDRA-833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840438#action_12840438
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Jonathan Ellis commented on CASSANDRA-833:
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To clarify: the #722 fix breaks the design because a bootstrapping node that
goes "down" temporarily but completes bootstrap will not actually have all the
writes that happened during bootstrap on it.
> fix consistencylevel during bootstrap
> -------------------------------------
>
> Key: CASSANDRA-833
> URL: https://issues.apache.org/jira/browse/CASSANDRA-833
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.5
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 0.6
>
>
> As originally designed, bootstrap nodes should *always* get *all* writes
> under any consistencylevel, so when bootstrap finishes the operator can run
> cleanup on the old nodes w/o fear that he might lose data.
> but if a bootstrap operation fails or is aborted, that means all writes will
> fail until the ex-bootstrapping node is decommissioned. so starting in
> CASSANDRA-722, we just ignore dead nodes in consistencylevel calculations.
> but this breaks the original design. CASSANDRA-822 adds a partial fix for
> this (just adding bootstrap targets into the RF targets and hinting
> normally), but this is still broken under certain conditions. The real fix
> is to consider consistencylevel for two sets of nodes:
> 1. the RF targets as currently existing (no pending ranges)
> 2. the RF targets as they will exist after all movement ops are done
> If we satisfy CL for both sets then we will always be in good shape.
> I'm not sure if we can easily calculate 2. from the current TokenMetadata,
> though.
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