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Posted to commits@cassandra.apache.org by "Kurt Greaves (JIRA)" <ji...@apache.org> on 2018/03/13 02:58:00 UTC
[jira] [Commented] (CASSANDRA-14309) Make hint window persistent
across restarts
[ https://issues.apache.org/jira/browse/CASSANDRA-14309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16396461#comment-16396461 ]
Kurt Greaves commented on CASSANDRA-14309:
------------------------------------------
Hint window patch:
|[trunk|https://github.com/apache/cassandra/compare/trunk...kgreav:14215-trunk-2]|
|[dtest|https://github.com/apache/cassandra-dtest/compare/master...kgreav:14309]|
> 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: Major
>
> 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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