Lou DeGenaro created UIMA-2689:
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Summary: DUCC webserver (WS) auto-cancel feature should not be
enabled for "shadows"
Key: UIMA-2689
URL: https://issues.apache.org/jira/browse/UIMA-2689
Project: UIMA
Issue Type: Bug
Reporter: Lou DeGenaro
Assignee: Lou DeGenaro
Priority: Minor
The auto-cancel feature is enabled when --cancel_on_interrupt flag is specified
at submit time. When this flag is specified, the WS expects to receive regular
pings from the submitter, which are automatically supplied by the associated
monitor. If pings are absent for too long (config'd in ducc.properties via
ducc.ws.job.automatic.cancel.minutes) the WS proceeds to cancel the job.
It is possible to run multiple WS instances (aka "shadows"). Since only one is
ping'd, the other(s) will detect a ping timeout and incorrectly cancel the job.
The solution is to have only the "primary" WS as the monitor+canceler. This is
determined by matching the specification in ducc.properties for WS host:port
with that of the actual host:port of the WS. Only if these match will the
auto-cancel code be enabled in the WS.
To bypass this problem until fix is delivered, run only a single WS.
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