hi,

appengine docs says -

*"*When implementing the code for tasks (as worker URLs within your app), it
is important to consider whether the task is
idempotent<http://en.wikipedia.org/wiki/idempotent>.
App Engine's Task Queue API is designed to only invoke a given task once,
however *it is possible in exceptional circumstances that a task may execute
multiple times* (e.g. in the unlikely case of major system failure). Thus,
your code must ensure that there are no harmful side-effects of repeated
execution.*"*


my doubt is -

in exceptional circumstances, is it possible that repeated task executions
happen in parallel (i.e. multiple invocations of same task on same or
different systems at the same time) ?

--
Prashant

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