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From "Rick Whitesel (rwhitese)" <>
Subject RE: Update of column sometimes takes 10 seconds
Date Mon, 26 Sep 2011 20:27:59 GMT
Thank you to all for the quick response. The test that fails is doing a
insert, another insert (to update data) and then a get to validate. If I
make multiple copies of the same test and execute them in succession,
different copies will fail on successive runs. Each test only has a
single get, so one would assume the get in testN must be causing testN+1
to fail.  It is going to take me a little bit to dig down deep enough
into our code to see if that is the issue.




From: Jonathan Ellis [] 
Sent: Monday, September 26, 2011 3:34 PM
Subject: Re: Update of column sometimes takes 10 seconds


Sounds a lot like this to me:

On Mon, Sep 26, 2011 at 1:55 PM, Rick Whitesel (rwhitese) <> wrote:

Hi All:


We have a simple junit test that inserts a column, immediately updates
that column and then validates that the data updated. Cassandra is run
embedded in the unit test. Sometimes the test will pass, i.e. the
updated data is correct, and sometimes the test will fail. The
configuration is set to:


<CommitLogSync>periodic</CommitLogSync> and


We are running version 0.6.9. We plan to update to the latest version
but cannot until after the release we are wrapping up. We are using the
client batch mutate to create and update the data. From what I
understand, the commit log write will return immediately and the data
will be store in memory. If that is the case, then why would our test
sometimes fail?


-Rick Whitesel



Simplify, Standardize and Conserve





Rick Whitesel
Technical Lead
Customer Contact Business Unit <> 
Phone :978-936-0479

500 Beaver Brook Road
Boxboro, MA 01719
Mailing address:
1414 Massachusetts Avenue
Boxboro, MA 01719
United States <> 



Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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