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From "Dave Latham (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9133) Use table dir modtime to avoid scanning table dir to check cached table descriptor
Date Mon, 05 Aug 2013 23:57:47 GMT
Dave Latham created HBASE-9133:
----------------------------------

             Summary: 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
             Fix For: 0.94.12


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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