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https://issues.apache.org/jira/browse/HBASE-6312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407732#comment-13407732
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Jason Dai commented on HBASE-6312:
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It is a fairly simple scenario:
1) The customer set hfile.block.cache.size to 2GB, and finds out his ~1.8GB of
data can never completely fit in cache
2) He asked how to fix this, and basically we can say that you need to set
hfile.block.cache.size to ~2.35GB
3) And then he asked why and what's the guideline for setting
hfile.block.cache.size, and we need to explain about the acceptable factor,
which is considered to be implementation details and not exposed.
This does not seem to be a very good user experience IMO.
> Make BlockCache eviction thresholds configurable
> ------------------------------------------------
>
> Key: HBASE-6312
> URL: https://issues.apache.org/jira/browse/HBASE-6312
> Project: HBase
> Issue Type: Improvement
> Components: io
> Affects Versions: 0.94.0
> Reporter: Jie Huang
> Priority: Minor
> Attachments: hbase-6312.patch
>
>
> Some of our customers found that tuning the BlockCache eviction thresholds
> made test results different in their test environment. However, those
> thresholds are not configurable in the current implementation. The only way
> to change those values is to re-compile the HBase source code. We wonder if
> it is possible to make them configurable.
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