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In thisĀ 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) $changeStream cannot run with a readConcern other than 'majority', or in a multi-document transaction. Current readConcern: { readConcern: { level: "local" } }
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Here is the mongodb source code in document_source_change_stream.h
void assertSupportsReadConcern(const repl::ReadConcernArgs& readConcern) const {
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// Only "majority" is allowed for change streams.
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uassert(ErrorCodes::InvalidOptions,
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str::stream() << "$changeStream cannot run with a readConcern other than "
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<< "'majority', or in a multi-document transaction. Current "
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"readConcern: "
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<< readConcern.toString(),
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!readConcern.hasLevel() ||
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readConcern.getLevel() == repl::ReadConcernLevel::kMajorityReadConcern);
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}
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It looks like the majority read concern is not disabled.
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