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From "Jason Dai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6312) Make BlockCache eviction thresholds configurable
Date Thu, 05 Jul 2012 23:31:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407600#comment-13407600
] 

Jason Dai commented on HBASE-6312:
----------------------------------

I think there are two different questions here:

1) Performance - whether the current values of acceptable & minimum factors make sense.
It seems nobody has definitive answers, and maybe we should make these more aggressive and
at least make the minimum configurable for people to experiment, just as J-D proposed.

2) User experience - whether the hfile.block.cache.size parameter provides the proper behaviors
as the user would expect. It seems that most of the time the user can only use the memory
size of hfile.block.cache.size * acceptable factor, which could be very confusing as the user
is not aware of acceptable factor at all. What I proposed above is to evict when the cache
size > hfile.block.cache.size, and block if cache size > hfile.block.cache.size * (1
+ acceptable factor).

                
> 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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