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Type:
Improvement
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Resolution: Community Answered
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Priority:
Major - P3
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None
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Affects Version/s: 4.2.3
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Component/s: Querying
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Labels:None
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Server Triage
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Fully Compatible
In this change stream post, the read concern majority option can be disabled in v4.2. So I try to use "read concern=local" to build the change stream in golang but failed:
(InvalidOptions) $changeStream cannot run with a readConcern other than 'majority', or in a multi-document transaction. Current readConcern: { readConcern: { level: "local" } }
Here is the mongodb source code in document_source_change_stream.h
void assertSupportsReadConcern(const repl::ReadConcernArgs& readConcern) const {
// Only "majority" is allowed for change streams.
uassert(ErrorCodes::InvalidOptions,
str::stream() << "$changeStream cannot run with a readConcern other than "
<< "'majority', or in a multi-document transaction. Current "
"readConcern: "
<< readConcern.toString(),
!readConcern.hasLevel() ||
readConcern.getLevel() == repl::ReadConcernLevel::kMajorityReadConcern);
}
It looks like the majority read concern is not disabled.