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From "Stefan Miklosovic (Jira)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14309) Make hint window persistent across restarts
Date Wed, 18 Aug 2021 07:17:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17400853#comment-17400853
] 

Stefan Miklosovic commented on CASSANDRA-14309:
-----------------------------------------------

branch: https://github.com/apache/cassandra/pull/1152
dtest: https://github.com/apache/cassandra-dtest/pull/153
CI build with dtest: https://ci-cassandra.apache.org/view/patches/job/Cassandra-devbranch/1034/

[~aleksey] would you take a look please?

> Make hint window persistent across restarts
> -------------------------------------------
>
>                 Key: CASSANDRA-14309
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14309
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Consistency/Hints
>            Reporter: Kurt Greaves
>            Assignee: Stefan Miklosovic
>            Priority: Low
>              Labels: 4.0-feature-freeze-review-requested
>             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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