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From Oleg Proudnikov <>
Subject Re: Question regarding major compaction.
Date Tue, 01 May 2012 20:00:28 GMT
Henrik Schröder <skrolle <at>> writes:

> But what's the difference between doing an extra read from that 
> One Big File, than doing an extra read from whatever SSTable 
> happen to be largest in the course of automatic minor compaction?

There is this note regarding major compaction in the tuning guide:

"once you run a major compaction, automatic minor compactions are no longer
triggered frequently forcing you to manually run major compactions on a routine

I think, this means that unless you run major compactions regularly, the number
of sstables will naturally grow leading to incremental degradation in read
performance for update workloads.


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