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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6312) Make BlockCache eviction thresholds configurable
Date Thu, 19 Jul 2012 21:51:37 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Daniel Cryans updated HBASE-6312:
--------------------------------------

      Resolution: Fixed
    Release Note: 
>From now on, the block cache will use all the memory it's given as its upper bound was
raised from 85% to 99%. The lower bound for evictions, called "minimum factor", was raised
from 75% to 95% and is now configurable via "hbase.lru.blockcache.min.factor". This means
that 4% of the block cache is evicted at a time instead of 10%, so evictions may run more
often but each will be less disruptive.

    Hadoop Flags: Reviewed
          Status: Resolved  (was: Patch Available)

Closed the jira and added a release note.
                
> 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
>            Assignee: Jie Huang
>            Priority: Minor
>             Fix For: 0.96.0
>
>         Attachments: hbase-6312.patch, hbase-6312_v2.patch, hbase-6312_v3.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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