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Type:
Improvement
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Status: Closed
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Priority:
Major - P3
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: 3.5.2
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Component/s: None
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Labels:
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Backwards Compatibility:Fully Compatible
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Epic Link:
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Sprint:Platforms 2017-01-23
The linter will complain if you use std::atomic<T>, suggesting AtomicWord<T> instead. However, the MONGO_EXPORT_SERVER_PARAMTER macro does not work with an AtomicWord<T> type, requiring all parameters that want to use this macro to be declared with a // NOLINT.
Here's an example of the error I got when trying to declare a server parameter with type AtomicInt32:
src/mongo/db/query/query_knobs.cpp:70:31: error: redefinition of 'internalQueryFacetBufferSizeBytes' with a different type: 'server_parameter_storage_type<AtomicInt32,
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ServerParameterType::kStartupAndRuntime>::value_type' (aka 'atomic<mongo::AtomicWord<int> >') vs 'AtomicInt32' (aka 'AtomicWord<int>')
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MONGO_EXPORT_SERVER_PARAMETER(internalQueryFacetBufferSizeBytes, AtomicInt32, 100 * 1024 * 1024);
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^
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src/mongo/db/query/query_knobs.h:113:20: note: previous declaration is here
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extern AtomicInt32 internalQueryFacetBufferSizeBytes; // NOLINT
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^
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In file included from src/mongo/db/query/query_knobs.cpp:31:
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src/mongo/db/server_parameters.h:195:5: error: static_assert failed "This type is not supported as a runtime server parameter."
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static_assert(paramType == ServerParameterType::kStartupOnly ||
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^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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src/mongo/db/query/query_knobs.cpp:70:1: note: in instantiation of template class 'mongo::ExportedServerParameter<mongo::AtomicWord<int>, mongo::ServerParameterType::kStartupAndRuntime>' requested here
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MONGO_EXPORT_SERVER_PARAMETER(internalQueryFacetBufferSizeBytes, AtomicInt32, 100 * 1024 * 1024);
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^
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src/mongo/db/server_parameters.h:246:5: note: expanded from macro 'MONGO_EXPORT_SERVER_PARAMETER'
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MONGO_EXPORT_SERVER_PARAMETER_IMPL( \
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^
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src/mongo/db/server_parameters.h:239:47: note: expanded from macro 'MONGO_EXPORT_SERVER_PARAMETER_IMPL'
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ExportedServerParameter<TYPE, PARAM_TYPE> _##NAME(ServerParameterSet::getGlobal(), #NAME, &NAME)
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^
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<scratch space>:153:1: note: expanded from here
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_internalQueryFacetBufferSizeBytes
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^
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2 errors generated.
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scons: *** [build/opt/mongo/db/query/query_knobs.os] Error 1
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scons: building terminated because of errors.
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build/opt/mongo/db/query/query_knobs.os failed: Error 1
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