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From "Arya Goudarzi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5412) Lots of deleted rows came back to life after upgrade from 1.1.6 to 1.1.10
Date Tue, 02 Apr 2013 02:03:15 GMT
Arya Goudarzi created CASSANDRA-5412:
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             Summary: Lots of deleted rows came back to life after upgrade from 1.1.6 to 1.1.10
                 Key: CASSANDRA-5412
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5412
             Project: Cassandra
          Issue Type: Bug
         Environment: Ubuntu 10.04 LTS
Sun Java 6 u39
1.1.6 and 1.1.10
            Reporter: Arya Goudarzi


Also per discussion here:  http://www.mail-archive.com/user@cassandra.apache.org/msg28905.html

I was not able to find any answers as to why a simple upgrade process could bring back a lot
of (millions) of deleted rows to life. We have successful repairs running on our cluster every
night. Unless repair is not doing its job, it is not possible to the best of my knowledge
that the deleted rows come back unless there is a bug. I have previously experienced this
issue when I upgraded our sandbox cluster. I failed at every single attempt to reproduce the
issue by restoring a fresh cluster from snapshot, and performing the upgrade from 1.1.6 to
1.1.10. I even exercised this with the snapshot of our production cluster before upgrading
and was not successful. So, I finally made the decision to upgrade, and guess what?! Millions
of deleted rows came back after the upgrade. 

This time I confirmed the timestamps of the deleted rows that came back; they were actually
before the time there were deleted. So, this is just like when tombstones get purged before
they get propagated. We use nanosecond precision timestamps (19 digits).

My discussion on the mailing list did not lead anywhere, though Aaron helped me find one another
possible way of this happening by Hinted Handoff which I filed a separate ticket for. I don't
believe this is an issue for us as we don't have nodes down for a long period of time. 


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