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From "Caleb Rackliffe (Jira)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-16721) Repaired data tracking on a read coordinator is susceptible to races between local and remote requests
Date Fri, 27 Aug 2021 17:04:00 GMT

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

Caleb Rackliffe updated CASSANDRA-16721:
----------------------------------------
          Fix Version/s:     (was: 4.0.x)
                             (was: 4.x)
                         4.1
                         4.0.1
          Since Version: 4.0.0
    Source Control Link: https://github.com/apache/cassandra/commit/585bc692918deea2b8c4b1098ee7e7478881f138
             Resolution: Fixed
                 Status: Resolved  (was: Ready to Commit)

Committed in {{cassandra-4.0}} as https://github.com/apache/cassandra/commit/585bc692918deea2b8c4b1098ee7e7478881f138
and merged up via https://github.com/apache/cassandra/commit/33979e3c916b2006e75a042fa4c806364dbbe5c1

> 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: 4.0.1, 4.1
>
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> 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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