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https://issues.apache.org/jira/browse/CASSANDRA-15071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcus Eriksson updated CASSANDRA-15071:
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Bug Category: Parent values: Correctness(12982)
Complexity: Challenging
Discovered By: User Report
Status: Open (was: Triage Needed)
> Materialized View Inconsistent With Base Table Update After Migrating To New
> DC
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-15071
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15071
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Bootstrap and Decommission,
> Feature/Materialized Views
> Reporter: Avraham Kalvo
> Priority: High
> Labels: cassandra, materializedviews, rebuilding
>
> We've recently completed a successful migration between two data centers in
> our Cassandra cluster.
> After adding the new DC nodes onto the existing cluster, and setting the
> keyspaces to replicate to both DCs and rebuilding the new DC nodes from the
> old one, we've cut-over the applications using those keyspaces o start using
> the new DC exclusively by connecting to its end-points and performing
> `LOCAL_` consistency level requests there (DCAwareRoundRobinPolicy on LOCAL
> DC).
> We noticed that once the apps started to read data from the materialized
> views in the new DC, that an inconsistency emerged, which wasn't there in the
> original DC from which we've migrated.
> I.e - source/old DC had the materialized view reflecting the column update on
> the base table, while target/new DC didn't (the column value in the MV
> remained the same as it was in the base table, prior to the update).
> We only found out about it being logged with a support ticket, and for now,
> mitigated it by simply recreating the materialized view.
> Looking for a root cause for such behavior, is this expected, is this
> somewhat of a requirement which wasn't fulfilled yet for the MV mechanism,
> such as the ones mentioned in CASSANDRA-13826?
> Thanks,
> Avi K
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