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From "Jon Meredith (Jira)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-16883) Weak visibility guarantees of Accumulator can lead to failure to recognize digest mismatches
Date Mon, 30 Aug 2021 17:38:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-16883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17406872#comment-17406872
] 

Jon Meredith commented on CASSANDRA-16883:
------------------------------------------

+1 patch looks good, failures look unrelated.

> Weak visibility guarantees of Accumulator can lead to failure to recognize digest mismatches
> --------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-16883
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16883
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Consistency/Coordination
>            Reporter: Caleb Rackliffe
>            Assignee: Caleb Rackliffe
>            Priority: Normal
>             Fix For: 3.0.x, 3.11.x
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The context for this problem is largely the same as CASSANDRA-16807. The difference is
that for 4.0+, CASSANDRA-16097 added an assertion to {{DigestResolver#responseMatch()}} that
ensures the responses snapshot has at least one visible element (although of course only one
element trivially cannot generate a mismatch and short-circuits immediately). In 3.0 and 3.11,
this assertion does not exist, and when the underlying problem occurs (i.e. zero responses
are visible on {{Accumulator}} when there should be 2), we can silently avoid the digest matching
entirely. This seems like it would make it both impossible to do a potentially necessary full
data read to resolve the correct response and prevent repair.
> The fix here should be similar to the one in CASSANDRA-16807, although there might be
some test infrastructure that needs porting in order to make that work.



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