Hi Shalom,


so not sure, but probably excessive memory consumption by this SELECT causes C* 
to flush tables to free memory. 


Best regards, Vladimir Yudovin, 

Winguzone - Hosted Cloud Cassandra
Launch your cluster in minutes.





---- On Thu, 10 Nov 2016 03:36:59 -0500Shalom Sagges 
<shal...@liveperson.com> wrote ----




Hi There!



I'm using C* 2.0.14. 

I experienced a scenario where a "select count(*)" that ran every minute on a 
table with practically no results limit (yes, this should definitely be 
avoided), caused a huge increase in Cassandra writes to around 150 thousand 
writes per second for that particular table.



Can anyone explain this behavior? Why would a Select query significantly 
increase write count in Cassandra?



Thanks!

 


 
Shalom Sagges
 

 

 
 
 
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