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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-5232) ALTER TABLE ADD - data loss
Date Fri, 08 Feb 2013 13:03:12 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne updated CASSANDRA-5232:
----------------------------------------

    Attachment: 5232.txt

That's a bug in DataTracker.replaceFlushed, that doesn't handle correctly the case where there
is no sstable created by the flush (and in that case one such flush is triggered by the ALTER).
Namely, it "removes" (from the DataTracker instance, not from disk) all existing sstables.
This actually comes from the CASSANDRA-4667 (the second patch committed). So in practice that
means that ALTER TABLE is just one of the thing this broke, but this also break the atomic
batch guarantees (as the batchlog sstables might be discarded wrongfully).

Trivial patch attached.

                
> ALTER TABLE ADD - data loss
> ---------------------------
>
>                 Key: CASSANDRA-5232
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5232
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.2.1
>            Reporter: Vasily V.D.
>         Attachments: 5232.txt
>
>
> cqlsh:Test> CREATE TABLE t1 (id int PRIMARY KEY, t text);
> cqlsh:Test> UPDATE t1 SET t = '111' WHERE id = 1;
> cqlsh:Test> ALTER TABLE t1 ADD l list<text>;
> cqlsh:Test> SELECT * FROM t1;
>  id | l    | t
> ----+------+-----
>   1 | null | 111
> cqlsh:Test> ALTER TABLE t1 ADD m map<int, text>;
> cqlsh:Test> SELECT * FROM t1;
> cqlsh:Test>
> Last query doesn't return any data.

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