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    <p>I'm going to provisionally answer my own question with a "no" -- and the hopes that someone more knowledgeable than me will come back with a solution.</p> <p>After looking more closely at the Celery documentation, I'm thinking that there simply isn't a way to access the arguments with which a parent task was called. According to the <a href="http://docs.celeryproject.org/en/latest/userguide/tasks.html#states" rel="nofollow">documentation</a>:</p> <blockquote> <p>During its lifetime a task will transition through several possible states, and each state may have arbitrary metadata attached to it. When a task moves into a new state the previous state is forgotten about..</p> </blockquote> <p>A task can be in one of the following states: Pending, Started, Success, Failure, Retry, and Revoked. For my scenario, the key here would, it seems, be the Success state. What I want to do is, for a given succeessful task, locate the id of (one of its) parent task(s), and then view the arguments with which the parent was called. However, according to the documentation, a task in the SUCCESS state will not contain this sort of data (since the parent task itself will have been successful insofar as it has spawned a child task):</p> <blockquote> <p>SUCCESS Task has been successfully executed.</p> <p>metadata: result contains the return value of the task. propagates: Yes ready: Yes</p> </blockquote> <p>In other words, it would seem that there's a hard limit here. Even if I can locate the ID of the parent task I'm interested in, because it has successfully executed, I will by definition not be able to access the arguments with which it was called because it only contains the return value (no longer its arguments).</p>
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    1. USBenjamin White
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