HCatalog startup script dies silently if pid file exists
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Key: HCATALOG-24
URL: https://issues.apache.org/jira/browse/HCATALOG-24
Project: HCatalog
Issue Type: Improvement
Reporter: Mac Yang
Possible solutions,
1. If the pid file exists, exit after printing the reason to the screen.
2. (preferred) If the pid file exists, check to see if a process is running at
that pid. If not, remove the pid file
and continue. If process is running at that pid, exit after printing the
reason to the screen.
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