Incorrect support for process CAS error threshold count and threshold window
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Key: UIMA-838
URL: https://issues.apache.org/jira/browse/UIMA-838
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Burn Lewis
The thresholdAction should be taken when the number of CAS errors reaches the
thresholdCount value within the last thresholdWindow CASes. A thresholdWindow
of 0 means an infinite window, so the action is taken when the total number of
errors reaches the thresholdCount. A thresholdCount of 0 means an infinite
limit, errors are ignored. A thresholdCount of 1 means that the first error
triggers the action, hence the action must be taken when the threshold is
REACHED, not exceeded as stated in the current docs. (Although thresholds
usually apply when exceeded, making the thresholdCount be the number permitted
would require using a value such as -1 for no threshold, in contrast to our use
of 0 to mean no timeout and no window)
It should be an error to specify a (non-zero) thresholdWindow that is smaller
than the thresholdCount ... an impossible situation.
Note that if thresholdCount = 1 the thresholdWindow value is irrelevant, and if
thresholdCount = thresholdWindow the action is taken when that many consecutive
errors occur.
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