If you had a query that went across the partitions and especially if you had 
vNodes set high, that would do it.

 

Kenneth Brotman

 

From: Subroto Barua [mailto:sbarua...@yahoo.com.INVALID] 
Sent: Friday, February 01, 2019 8:45 AM
To: User cassandra.apache.org
Subject: Help with sudden spike in read requests

 

In our production cluster, we observed sudden spike (over 160 MB/s) in read 
requests on *all* Cassandra nodes for a very short period (less than a min); 
this event happens few times a day.

 

I am not able to get to the bottom of this issue, nothing interesting in 
system.log or from app level; repair was not running

 

Does anyone have any thoughts on what could have triggered this event? Under 
what condition C* (if it is tied to c*) will trigger this type of event?

 

Thanks!

 

Subroto

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