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Type: Improvement
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Resolution: Fixed
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Priority: Major - P3
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Affects Version/s: None
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Component/s: Replication
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Labels:None
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Minor Change
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Repl 2020-02-24
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0
In 4.4 we introduce a "term" field to replica set configs, and include the term as a "configTerm" field in heartbeat requests and responses. A MongoDB 4.4 server will understand this field (even if it's in FCV 4.2), but older MongoDB servers will reject a heartbeat request or response that includes this new field.
If the local config lacks a term (which is expressed in the code as term -1, orĀ OpTime::kUninitializedTerm), then omit configTerm from heartbeats. This way, MongoDB 4.4 heartbeats will be compatible with 4.2, so long as the local config is in the 4.2 format and lacks a term.