QuantConnect / QuantConnect/Lean
Double OnData Call When Add Subcription in Scheduled Event
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- Dominant language
- C#
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Description
Expected Behavior
OnData is called once per period.
Actual Behavior
OnData is called more than once when we add a subscription during a scheduled event
Potential Solution
N/A
Reproducing the Problem
https://www.quantconnect.cloud/backtest/c932358231d295109bcb90e66e26fa74/?theme=chrome
Checklist
- I have completely filled out this template
- I have confirmed that this issue exists on the current
masterbranch - I have confirmed that this is not a duplicate issue by searching issues
- I have provided detailed steps to reproduce the issue
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked QuantConnect backtest and trace how adding a subscription during a scheduled event affects OnData dispatch. Compare the event flow with the expected once-per-period behavior, then add a regression test covering subscription changes during scheduled events. Done means OnData is called only once per period in that scenario.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100