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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2013/08/06 05:48:48 UTC
[jira] [Updated] (HBASE-9133) Use table dir modtime to avoid
scanning table dir to check cached table descriptor
[ 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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