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https://issues.apache.org/jira/browse/CASSANDRA-8368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649483#comment-14649483
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Aleksey Yeschenko commented on CASSANDRA-8368:
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FWIW BL ignores {{max_hint_window_in_ms}}, and always writes hints to the hints
table, no matter what, so there is that.
> Consider not using hints for batchlog replay, in any capacity
> -------------------------------------------------------------
>
> Key: CASSANDRA-8368
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8368
> Project: Cassandra
> Issue Type: Bug
> Reporter: Aleksey Yeschenko
> Fix For: 3.0.0 rc1
>
>
> Currently, when replaying a batch, if a request times out, we simply write a
> hint for it and call it a day.
> It's simple, but it does tie us to hints, which some people prefer to disable
> altogether (and some still will even after CASSANDRA-6230).
> It also potentially violates the consistency level of the original request.
> As an alternative, once CASSANDRA-7237 is complete, I suggest we stop relying
> on hints at all, and do this instead:
> 1. Store the consistency level as batch metadata
> 2. On replay, hint in case of a timeout, but not if the node is down as per FD
> 3. If CL is met, consider the batch replayed and discard it, but not account
> the hints towards CL (as per usual write patch), unless CL.ANY is being used
> 4. If CL is *not* met, write a new batch with contents of the current one,
> but with timeuuid set in the future, for later replay (delayed by fixed
> configurable time or exponentially backed off). With that new batch store the
> list of nodes we've delivered the hint to, so that next time we replay it we
> don't waste writes.
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