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From "Paulo Motta (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-13657) Materialized Views: Index MV on TTL'ed column produces orphanized view entry if another column keeps entry live
Date Tue, 05 Sep 2017 07:59:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-13657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paulo Motta resolved CASSANDRA-13657.
-------------------------------------
    Resolution: Duplicate

Fixed on CASSANDRA-11500, closing as duplicate.

> Materialized Views: Index MV on TTL'ed column produces orphanized view entry if another
column keeps entry live
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-13657
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13657
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Materialized Views
>            Reporter: Fridtjof Sander
>            Assignee: Krishna Dattu Koneru
>              Labels: materializedviews, ttl
>
> {noformat}
> CREATE TABLE t (k int, a int, b int, PRIMARY KEY (k));
> CREATE MATERIALIZED VIEW mv AS SELECT * FROM t WHERE k IS NOT NULL AND a IS NOT NULL
PRIMARY KEY (a, k);
> INSERT INTO t (k) VALUES (1);
> UPDATE t USING TTL 5 SET a = 10 WHERE k = 1;
> UPDATE t SET b = 100 WHERE k = 1;
> SELECT * from t; SELECT * from mv;
>  k | a  | b
> ---+----+-----
>  1 | 10 | 100
> (1 rows)
>  a  | k | b
> ----+---+-----
>  10 | 1 | 100
> (1 rows)
> -- 5 seconds later
> SELECT * from t; SELECT * from mv;
>  k | a    | b
> ---+------+-----
>  1 | null | 100
> (1 rows)
>  a  | k | b
> ----+---+-----
>  10 | 1 | 100
> (1 rows)
> -- that view entry's liveness-info is (probably) dead, but the entry is kept alive by
b=100
> DELETE b FROM t WHERE k=1;
> SELECT * from t; SELECT * from mv;
>  k | a    | b
> ---+------+------
>  1 | null | null
> (1 rows)
>  a  | k | b
> ----+---+-----
>  10 | 1 | 100
> (1 rows)
> DELETE FROM t WHERE k=1;
> cqlsh:test> SELECT * from t; SELECT * from mv;
>  k | a | b
> ---+---+---
> (0 rows)
>  a  | k | b
> ----+---+-----
>  10 | 1 | 100
> (1 rows)
> -- deleting the base-entry doesn't help, because the view-key can not be constructed
anymore (a=10 already expired)
> {noformat}
> The problem here is that although the view-entry's liveness-info (probably) expired correctly
a regular column (`b`) keeps the view-entry live. It should have disappeared since it's indexed
column (`a`) expired in the corresponding base-row. This is pretty severe, since that view-entry
is now orphanized.



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