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https://issues.apache.org/jira/browse/CASSANDRA-8434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-8434.
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Resolution: Later
OTOH automatically bumping up BF granularity for L0 when it's in an overload
situation could cause other kinds of badness, e.g. unexpected memory pressure.
Not sure if this is worth the cost/benefit to solve robustly, so closing as
Later.
> L0 should have a separate configurable bloom filter false positive ratio
> ------------------------------------------------------------------------
>
> Key: CASSANDRA-8434
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8434
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Benedict
> Fix For: 2.1.x
>
>
> In follow up to CASSANDRA-5371. We now perform size-tiered file selection for
> compaction if L0 gets too far behind, however as far as I can tell we stick
> with the CF configured false positive ratio, likely inflating substantially
> the number of files we visit on average until L0 is cleaned up. Having a a
> different bf fp for L0 would solve this problem without introducing any
> significant burden when L0 is not overloaded.
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