Details
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Task
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Status: Closed
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Major - P3
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Resolution: Fixed
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None
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None
Description
Description
Description:
Document the changed behavior in adding a 4.0 mongos to a 4.2 cluster
Engineering Ticket Description:
As part ofÂ
SERVER-32635, a last-stable binary version mongos will crash upon attempting to connect to a latest featureCompatibilityVersion cluster. However, since this behavior was added for 4.0 mongos and FCV 4.2 was not present at the time, some special testing behavior was necessary to simulate a 4.0 mongos crashing. As part of the 4.2 upgrade/downgrade work, the crash_mongos_against_upgraded_cluster.js test should be updated to no longer rely on these failpoints and just directly use a 4.0 mongos and FCV 4.2 cluster. The failpoints/wireVersion added as part ofSERVER-32635solely for simulation of the crash should also be removed.
Scope of changes
- Add note to:
- mongos ref and conceptual pages
- sharded cluster update page
- the 4.0 version already mentions the fcv/mongos in 4.0 compatibility:
- for now, won't add to 4.0 mongos ref and conceptual pages
Impact to Other Docs
MVP (Work and Date)
Resources (Scope or Design Docs, Invision, etc.)
Attachments
Issue Links
- documents
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SERVER-35656 Ensure a 4.0 mongos crashes upon attempting to connect to an FCV 4.2 cluster
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- Closed
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