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From "Caleb Rackliffe (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (CASSANDRA-16721) Repaired data tracking on a read coordinator is susceptible to races between local and remote requests
Date Wed, 18 Aug 2021 16:08:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-16721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Caleb Rackliffe reassigned CASSANDRA-16721:
-------------------------------------------

    Assignee: Caleb Rackliffe  (was: Sam Tunnicliffe)

> 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: Caleb Rackliffe
>            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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