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Type:
Improvement
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Resolution: Won't Do
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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Labels:
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Sharding EMEA
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Sharding EMEA 2023-03-20, Sharding EMEA 2023-04-03, Sharding EMEA 2023-06-26, Sharding EMEA 2023-07-10, Sharding EMEA 2023-07-24, Sharding EMEA 2023-08-07, Sharding EMEA 2023-08-21, Sharding EMEA 2023-09-04, Sharding EMEA 2023-09-18, Sharding EMEA 2023-10-02, Sharding EMEA 2023-10-16, Sharding EMEA 2023-10-30
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1
When populating DocumentSourceMergeCursors we extract the TaskExecutor from the MongoProcessInterface of the given epression context. This is not always safe because the MongoProcessInterface could be built with a null executor.
In case a null executor is used the underlying BlockingResultsMerger will through a Segfault on first execution of getNext, that is difficult to debug.
In order to ease the debug process and early detect those programming errors I would suggest to use invariants to ensure the TaskExecutor is valid when populating the DocumentSourceMergeCursor stage.
Additionally we should ask similar invariant in the constructor of AsyncResultsMerger.