Re: Changing bloom filter false positive ratio

2012-09-14 Thread Peter Schuller
> I have a hunch that the SSTable selection based on the Min and Max keys in > ColumnFamilyStore.markReferenced() means that a higher false positive has > less of an impact. > > it's just a hunch, i've not tested it. For leveled compaction, yes. For non-leveled, I can't see how it would since each

Re: Changing bloom filter false positive ratio

2012-09-14 Thread aaron morton
I have a hunch that the SSTable selection based on the Min and Max keys in ColumnFamilyStore.markReferenced() means that a higher false positive has less of an impact. it's just a hunch, i've not tested it. Cheers - Aaron Morton Freelance Developer @aaronmorton http://www.the

Re: Changing bloom filter false positive ratio

2012-09-13 Thread Eric Czech
Thanks Peter. On Thu, Sep 13, 2012 at 12:52 PM, Peter Schuller wrote: >> changing it on some of them. Can I just change that value through the >> cli and restart or are there any concerns I should have before trying >> to tweak that parameter? > > You can change it, you don't have to restart. It

Changing bloom filter false positive ratio

2012-09-12 Thread Eric Czech
Hi everyone, I'm running into heap pressure issues and I seem to have traced the problem to very large bloom filters. The bloom_filter_fp_chance is set to the default value on all my column families but I'd like to try changing it on some of them. Can I just change that value through the cli and