Kurt Greaves updated CASSANDRA-14309:
    Fix Version/s: 4.x

> Make hint window persistent across restarts
> -------------------------------------------
>                 Key: CASSANDRA-14309
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14309
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hints
>            Reporter: Kurt Greaves
>            Assignee: Kurt Greaves
>            Priority: Minor
>             Fix For: 4.x
> The current hint system stores a window of hints as defined by 
> {{max_hint_window_in_ms}}, however this window is not persistent across 
> restarts.
> Examples (cluster with RF=3 and 3 nodes, A, B, and C):
>  # A goes down
>  # X ms of hints are stored for A on B and C
>  # A is restarted
>  # A goes down again without hints replaying from B and C
>  # B and C will store up to another {{max_hint_window_in_ms}} of hints for A
>  # A goes down
>  # X ms of hints are stored for A on B and C
>  # B is restarted
>  # B will store up to another {{max_hint_window_in_ms}} of hints for A
> Note that in both these scenarios they can continue forever. If A or B keeps 
> getting restarted hints will continue to pile up.
> Idea of this ticket is to stop this behaviour from happening and only ever 
> store up to {{max_hint_window_in_ms}} of hints for a particular node.

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