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https://issues.apache.org/jira/browse/CASSANDRA-12783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16135083#comment-16135083
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Kurt Greaves commented on CASSANDRA-12783:
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[trunk|https://github.com/apache/cassandra/compare/trunk...kgreav:trunk-11670?expand=1]
BatchlogManager is more or less done which is the main component. Haven't fixed
{{LegacyBatchlogMigrator}} yet so plz ignore (the version there is from the
last batchlog migration). Still got a bit of work to do on tests, but will
continue with that after sorting out UUID issue. For interests sake, in the
test {{testUUIDComparison}} id1 will occasionally return a UUID that is < id2,
despite id2 having a timestamp (and uuid for that matter) that is far lower.
This is a problem
[here|https://github.com/apache/cassandra/compare/trunk...kgreav:trunk-11670?expand=1#diff-c77d5f1027ee5e8a49e106903a4ca937R318]
the code will occasionally delete a batch that shouldn't be expired.
Also totally open to ideas/criticism regarding the whole design, specifically
the expiry stuff as not sure yet if that will have other implications.
cc [~pauloricardomg] if you want to have a look
> Break up large MV mutations to prevent OOMs
> -------------------------------------------
>
> Key: CASSANDRA-12783
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12783
> Project: Cassandra
> Issue Type: Bug
> Components: Local Write-Read Paths, Materialized Views
> Reporter: Carl Yeksigian
> Assignee: Kurt Greaves
> Fix For: 4.x
>
>
> We only use the code path added in CASSANDRA-12268 for the view builder
> because otherwise we would break the contract of the batchlog, where some
> mutations may be written and pushed out before the whole batch log has been
> saved.
> We would need to ensure that all of the updates make it to the batchlog
> before allowing the batchlog manager to try to replay them, but also before
> we start pushing out updates to the paired replicas.
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