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What exception does com.google.appengine.api.datastore.Transaction.commit() throw when there is a concurrency problem?
I want to retry if there is a concurrency issue, but I don’t know what exception to catch.
As per the docs, it raises a TransactionFailedError. Retrying is a bad idea, though: The error gets thrown when there’s too much contention, and retrying will simply increase the contention. If you want to change the number of retries, use run_in_transaction_custom_retries, documented here.