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From "Marcus Eriksson (Jira)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-15461) Legacy counter shards can cause false positives in repaired data tracking
Date Thu, 16 Jan 2020 15:38:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-15461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marcus Eriksson updated CASSANDRA-15461:
----------------------------------------
    Reviewers: Marcus Eriksson, Marcus Eriksson  (was: Marcus Eriksson)
               Marcus Eriksson, Marcus Eriksson  (was: Marcus Eriksson)
       Status: Review In Progress  (was: Patch Available)

> Legacy counter shards can cause false positives in repaired data tracking
> -------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15461
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15461
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Observability/Metrics
>            Reporter: Sam Tunnicliffe
>            Assignee: Sam Tunnicliffe
>            Priority: Normal
>             Fix For: 4.0-beta
>
>
> It is expected that the serialization of legacy (pre-2.1) counter cells may differ across
replicas due to the remote vs local designation of the shards. This will cause the repaired
data digests calculated at read time to differ where certain legacy shards are encountered.
This does not, however, indicate corruption of the repaired dataset and there isn't any action
that operators can take in this scenario. Excluding counter cells which contain legacy shards
from the digest calculation will avoid false positives.



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