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https://issues.apache.org/jira/browse/CASSANDRA-16721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17400123#comment-17400123
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Caleb Rackliffe edited comment on CASSANDRA-16721 at 8/17/21, 4:36 AM:
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I took a stab at it [here|https://github.com/apache/cassandra/pull/1149].
(There are still a few TODOs lying around.) Let's see if I
[broke|https://app.circleci.com/pipelines/github/maedhroz/cassandra?branch=CASSANDRA-16721-local-rdi]
anything...
was (Author: maedhroz):
I took a stab at it [here|https://github.com/apache/cassandra/pull/1149]. Let's
see if I
[broke|https://app.circleci.com/pipelines/github/maedhroz/cassandra?branch=CASSANDRA-16721-local-rdi]
anything...
> Repaired data tracking on a read coordinator is susceptible to races between
> local and remote requests
> ------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-16721
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16721
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Coordination
> Reporter: Sam Tunnicliffe
> Assignee: Sam Tunnicliffe
> Priority: Normal
> Fix For: 4.0.x
>
>
> At read time on a coordinator which is also a replica, the local and remote
> reads can race such that the remote responses are received while the local
> read is executing. If the remote responses are mismatching, triggering a
> {{DigestMismatchException}} and subsequent round of full data reads and read
> repair, the local runnable may find the {{isTrackingRepairedStatus}} flag
> flipped mid-execution. If this happens after a certain point in execution,
> it would mean
> that the RepairedDataInfo instance in use is the singleton null object
> {{RepairedDataInfo.NULL_REPAIRED_DATA_INFO}}. If this happens, it can lead to
> an NPE when calling {{RepairedDataInfo::extend}} when the local results are
> iterated.
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