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From "Chinmay Kulkarni (Jira)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-6129) Remove unnecessary HBase Admin API calls when writing and deleting mutex cells
Date Sat, 12 Sep 2020 00:45:00 GMT
Chinmay Kulkarni created PHOENIX-6129:
-----------------------------------------

             Summary: Remove unnecessary HBase Admin API calls when writing and deleting mutex
cells
                 Key: PHOENIX-6129
                 URL: https://issues.apache.org/jira/browse/PHOENIX-6129
             Project: Phoenix
          Issue Type: Improvement
    Affects Versions: 4.15.0, 5.0.0
            Reporter: Chinmay Kulkarni
             Fix For: 5.1.0, 4.16.0


Inside CQSI.writeMutexCell(), we call [getSysMutexPhysicalTableNameBytes()|https://github.com/apache/phoenix/blob/e3c7b4bdce2524eb4fd1e7eb0ccd3454fcca81ce/phoenix-core/src/main/java/org/apache/phoenix/query/ConnectionQueryServicesImpl.java#L4244]
which in turn calls HBase Admin APIs to check the existence of SYSTEM.MUTEX/SYSTEM:MUTEX [here|https://github.com/apache/phoenix/blob/e3c7b4bdce2524eb4fd1e7eb0ccd3454fcca81ce/phoenix-core/src/main/java/org/apache/phoenix/query/ConnectionQueryServicesImpl.java#L4309-L4312].

Later, we anyways try to get the HTable both inside [writeMutexCell()|https://github.com/apache/phoenix/blob/e3c7b4bdce2524eb4fd1e7eb0ccd3454fcca81ce/phoenix-core/src/main/java/org/apache/phoenix/query/ConnectionQueryServicesImpl.java#L4245]
and [deleteMutexCell()|https://github.com/apache/phoenix/blob/e3c7b4bdce2524eb4fd1e7eb0ccd3454fcca81ce/phoenix-core/src/main/java/org/apache/phoenix/query/ConnectionQueryServicesImpl.java#L4289].
Instead, we can lazily fail this getTable() call (by catching the HBase TableNotFoundException)
to avoid additional HBase Admin API calls.



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