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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-9133) Use table dir modtime to avoid scanning table dir to check cached table descriptor
Date Tue, 06 Aug 2013 03:48:48 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-9133:
---------------------------------

    Fix Version/s:     (was: 0.94.12)
    
> Use table dir modtime to avoid scanning table dir to check cached table descriptor
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-9133
>                 URL: https://issues.apache.org/jira/browse/HBASE-9133
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Dave Latham
>            Assignee: Dave Latham
>
> As described in HBASE-8778, anything that needs to read table descriptors (such as region
assignments) currently results in a table directory scan which is slow on tables with many
regions.  HBASE-8778 moved the table descriptors to a subdir for 0.96+.  For 0.94 a smaller
change that is safe with rolling restarts is to cache the directory modtime and use the cached
table descriptor if the directory modtime has not changed since a table descriptor change
always changes the directory.

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