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https://issues.apache.org/jira/browse/CASSANDRA-8272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17126726#comment-17126726
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Andres de la Peña commented on CASSANDRA-8272:
----------------------------------------------
Committed to {{cassandra-3.0}} as
[dd255ffa07d0263521a1ca863fc2192db19bc04c|https://github.com/apache/cassandra/commit/dd255ffa07d0263521a1ca863fc2192db19bc04c]
and merged up to {{cassandra-3.0}} and {{trunk}}.
Dtests committed as
[68f05b02842ccf4b2859d35a057d3be77d3313ab|https://github.com/apache/cassandra-dtest/commit/68f05b02842ccf4b2859d35a057d3be77d3313ab].
Thanks for the reviews.
> 2ndary indexes can return stale data
> ------------------------------------
>
> Key: CASSANDRA-8272
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8272
> Project: Cassandra
> Issue Type: Bug
> Components: Feature/2i Index
> Reporter: Sylvain Lebresne
> Assignee: Andres de la Peña
> Priority: Normal
> Labels: pull-request-available
> Fix For: 3.0.x, 3.11.x, 4.0-beta
>
> Time Spent: 6h 10m
> Remaining Estimate: 0h
>
> When replica return 2ndary index results, it's possible for a single replica
> to return a stale result and that result will be sent back to the user,
> potentially failing the CL contract.
> For instance, consider 3 replicas A, B and C, and the following situation:
> {noformat}
> CREATE TABLE test (k int PRIMARY KEY, v text);
> CREATE INDEX ON test(v);
> INSERT INTO test(k, v) VALUES (0, 'foo');
> {noformat}
> with every replica up to date. Now, suppose that the following queries are
> done at {{QUORUM}}:
> {noformat}
> UPDATE test SET v = 'bar' WHERE k = 0;
> SELECT * FROM test WHERE v = 'foo';
> {noformat}
> then, if A and B acknowledge the insert but C respond to the read before
> having applied the insert, then the now stale result will be returned (since
> C will return it and A or B will return nothing).
> A potential solution would be that when we read a tombstone in the index (and
> provided we make the index inherit the gcGrace of it's parent CF), instead of
> skipping that tombstone, we'd insert in the result a corresponding range
> tombstone.
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