[jira] [Closed] (HBASE-9133) Use table dir modtime to avoid scanning table dir to check cached table descriptor

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

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

Andrew Kyle Purtell closed HBASE-9133.
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    Assignee:     (was: Dave Latham)

> 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
>            Priority: Major
>
> 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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