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From "honghua zhu (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5492) Caching StartKeys and EndKeys of Regions
Date Wed, 29 Feb 2012 16:21:58 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

honghua zhu updated HBASE-5492:
-------------------------------

    Attachment: HBASE-5492.patch
    
> Caching StartKeys and EndKeys of Regions
> ----------------------------------------
>
>                 Key: HBASE-5492
>                 URL: https://issues.apache.org/jira/browse/HBASE-5492
>             Project: HBase
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 0.92.0
>         Environment: all
>            Reporter: honghua zhu
>             Fix For: 0.92.1
>
>         Attachments: HBASE-5492.patch
>
>
> Each call for HTable.getStartEndKeys will read meta table.
> In particular, 
> in the case of client side multi-threaded concurrency statistics, 
> we must call HTable.coprocessorExec== > getStartKeysInRange ==> getStartEndKeys,
> resulting in the need to always scan the meta table.
> This is not necessary,
> we can implement the HConnectionManager.HConnectionImplementation.locateRegions(byte[]
tableName) method,
> then, get the StartKeys and EndKeys from the cachedRegionLocations of HConnectionImplementation.
> Combined with https://issues.apache.org/jira/browse/HBASE-5491, can improve the performance
of statistical

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