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Posted to commits@cassandra.apache.org by "David Capwell (Jira)" <ji...@apache.org> on 2020/02/04 18:33:00 UTC

[jira] [Commented] (CASSANDRA-14740) BlockingReadRepair does not maintain monotonicity during range movements

    [ https://issues.apache.org/jira/browse/CASSANDRA-14740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17030047#comment-17030047 ] 

David Capwell commented on CASSANDRA-14740:
-------------------------------------------

spoke to sam about this; MessageForwardingTest is a regression and not an existing issue.

This test used to fail on java 11 (was stable on java 8) because of a change in behavior of java Streams; Blake fixed that in 1f7e3c2835c79363025a01a8470ee85d17457cf8 and since then the test has been stable.

The test is now failing in both java 8 and java 11 and isn't flaky, fails 100% of the time.

> BlockingReadRepair does not maintain monotonicity during range movements
> ------------------------------------------------------------------------
>
>                 Key: CASSANDRA-14740
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14740
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Legacy/Coordination
>            Reporter: Benedict Elliott Smith
>            Assignee: Benedict Elliott Smith
>            Priority: Urgent
>              Labels: correctness
>             Fix For: 4.0, 4.0-alpha
>
>
> The BlockingReadRepair code introduced by CASSANDRA-10726 requires that each of the queried nodes are written to, but pending nodes are not considered.  If there is a pending range movement, one of these writes may be ‘lost’ when the range movement completes.



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