Esteban Gutierrez created HBASE-12219:
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Summary: Use optionally a TTL based cache for
FSTableDescriptors#getAll() and FSTableDescriptors#TableDescriptorAndModtime()
Key: HBASE-12219
URL: https://issues.apache.org/jira/browse/HBASE-12219
Project: HBase
Issue Type: Bug
Components: master
Affects Versions: 0.98.6.1, 0.94.24, 0.99.1
Reporter: Esteban Gutierrez
Assignee: Esteban Gutierrez
Currently table descriptors and tables are cached once they are accessed for
the first time. Next calls to the master only require a trip to HDFS to lookup
the modified time in order to reload the table descriptors if modified. However
in clusters with a large number of tables or concurrent clients and this can be
too aggressive to HDFS and the master causing contention to process other
requests. A simple solution is to have a TTL based cached for
FSTableDescriptors#getAll() and FSTableDescriptors#TableDescriptorAndModtime()
that can allow the master to process those calls faster without causing
contention without having to perform a trip to HDFS for every call. to
listtables() or getTableDescriptor()
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