[rest/stargate] Improve error response when trying to create a scanner on a
nonexistant table
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Key: HBASE-2907
URL: https://issues.apache.org/jira/browse/HBASE-2907
Project: HBase
Issue Type: Improvement
Components: rest
Reporter: Kieron Briggs
Priority: Minor
Since 0.20.4, an attempt to create a scanner for a nonexistant table receives a
"400 Bad Request" response with no furthur information. Prior to 0.20.4 it
would receive a "500 org.apache.hadoop.hbase.TableNotFoundException: <table>"
response with a stack trace in the body.
Neither of these is ideal - the 400 fails to identify what aspect of the
request was bad, and the 500 incorrectly suggests that the error was internal.
Ideally the error should be a 400 error with information in the body
identifying the nature of the problem.
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