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https://issues.apache.org/jira/browse/CASSANDRA-4885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13606144#comment-13606144
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Sylvain Lebresne commented on CASSANDRA-4885:
---------------------------------------------
bq. If we were writing Cassandra from scratch today
But we're not. I do think that providing an option and removing it is different
from never implementing it in the first place because in the former case some
people may have start relying on it. I also don't share your confidence that
row-level BF are only ever useful in some niche workloads that we don't care
about (I do suspect that's largely true but I'm not totally confident). Anyway,
I can agree to disagree so do go on. After all, I don't disagree they should be
disabled by default, I just disagree that it's not worth keeping them as an
option just in case we had under-evaluated how useful they can be.
bq. you can come up with workloads that row cache benefits too.
Well, I happen to disagree about the removal of the row cache (until we have
something better that is), so I guess I'm coherent here.
> Remove or rework per-row bloom filters
> --------------------------------------
>
> Key: CASSANDRA-4885
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4885
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Jason Brown
> Fix For: 2.0
>
> Attachments: 0001-CASSANRDA-4885-Remove-per-row-bloom-filter.patch,
> 0002-CASSANRDA-4885-update-test.patch, 4885-v1.patch
>
>
> Per-row bloom filters may be a misfeature.
> On small rows we don't create them.
> On large rows we essentially only do slice queries that can't take advantage
> of it.
> And on very large rows if we ever did deserialize it, the performance hit of
> doing so would outweigh the benefit of skipping the actual read.
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