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Date: Sat, 17 Sep 2016 15:35:20 +0000 (UTC)
From: "Wei Deng (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Commented] (CASSANDRA-12659) Query in reversed order brough
 back deleted data
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archived-at: Sat, 17 Sep 2016 15:35:22 -0000


    [ https://issues.apache.org/jira/browse/CASSANDRA-12659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15499215#comment-15499215 ] 

Wei Deng commented on CASSANDRA-12659:
--------------------------------------

Can you reliably reproduce this problem? If yes, it would be very helpful if you describe the repro steps so that somebody can take a closer look.

BTW, "there are no tombstones left" doesn't mean you're safe. You may have run into a typical ["zombie resurrection"|http://thelastpickle.com/blog/2016/07/27/about-deletes-and-tombstones.html] situation when the system cleared up all of the tombstones.

> Query in reversed order brough back deleted data
> ------------------------------------------------
>
>                 Key: CASSANDRA-12659
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12659
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Cassandra 3.0.5, 6 nodes cluster
>            Reporter: Tai Khuu Tan
>
> We have and issues with our Cassandra 3.0.5. After we deleted a large amount of data in the multiple partition keys. Query those partition keys with reversed order on a clustering key return the deleted data. I have checked and there are no tombstones left. All of them are deleted. So I don't know where or how can those deleted data still exist. Is there any other place that Cassandra will read data when query in reverse order compare to normal order ?
> the schema is very simple
> {noformat}
> CREATE TABLE table ( uid varchar, version timestamp, data1 varchar, data2 varchar, data3 varchar, data4 varchar, data5 varchar, PRIMARY KEY (uid, version, data1 , data2 , data3 , data4 ) ) with compact storage;
> {noformat}
> Query are doing reverse order on column timestamp
> Ex:
> {noformat}
> select * from data where uid="uid1" order by version DESC
> {noformat}


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