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From "Rick Whitesel (rwhitese)" <rwhit...@cisco.com>
Subject RE: Update of column sometimes takes 10 seconds
Date Mon, 26 Sep 2011 19:08:36 GMT
Waiting 10 seconds between the update and reading the updated data seems
to always work. Not waiting the 10 seconds will cause the test to
randomly pass or fail. 

 

-Rick

 

From: Jim Ancona [mailto:jim@anconafamily.com] 
Sent: Monday, September 26, 2011 3:04 PM
To: user@cassandra.apache.org
Subject: Re: Update of column sometimes takes 10 seconds

 

Do you actually see the update occur if you wait for 10 seconds (as your
subject implies), or do you just see intermittent failures when running
the unit test? If it's the latter, are you sure that the update has a
greater timestamp than the insert? I've seen similar unit tests fail
because because the timestamp values were the same. 

 

Jim

 

On Mon, Sep 26, 2011 at 2:55 PM, Rick Whitesel (rwhitese) <
rwhitese@cisco.com> 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
<CommitLogSyncPeriodInMS>10000</CommitLogSyncPeriodInMS>

 

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

rwhitese@cisco.com <mailto:nordberg@cisco.com> 
Phone :978-936-0479


500 Beaver Brook Road
Boxboro, MA 01719
Mailing address:
1414 Massachusetts Avenue
Boxboro, MA 01719
United States
www.cisco.com <http://www.cisco.com/> 

 

 

 


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