Dave Latham created HBASE-9132:
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Summary: Use table dir modtime to avoid scanning table dir to
check cached table descriptor
Key: HBASE-9132
URL: https://issues.apache.org/jira/browse/HBASE-9132
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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