diff options
Diffstat (limited to 'src/mongo/db/mongod_options.cpp')
| -rw-r--r-- | src/mongo/db/mongod_options.cpp | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/mongo/db/mongod_options.cpp b/src/mongo/db/mongod_options.cpp index 0957953cf05..f0722782157 100644 --- a/src/mongo/db/mongod_options.cpp +++ b/src/mongo/db/mongod_options.cpp @@ -499,11 +499,41 @@ Status storeMongodOptions(const moe::Environment& params) { // storage engines will continue to perform regular capped collection handling for the oplog // collection, regardless of this parameter setting. storageGlobalParams.allowOplogTruncation = false; + + // Standalone mode does not currently support lock-free reads, so we disable it. If the user + // tries to explicitly enable it by specifying --disableLockFreeReads=false, log a warning + // so that the user knows the feature will not run in standalone mode. + if (!storageGlobalParams.disableLockFreeReads) { + LOGV2_WARNING( + 4788400, + "Lock-free reads is not supported in standalone mode: disabling lock-free reads."); + storageGlobalParams.disableLockFreeReads = true; + } } if (params.count("replication.enableMajorityReadConcern")) { serverGlobalParams.enableMajorityReadConcern = params["replication.enableMajorityReadConcern"].as<bool>(); + + if (!serverGlobalParams.enableMajorityReadConcern) { + // Lock-free reads are not supported with enableMajorityReadConcern=false, so we disable + // them. If the user tries to explicitly enable lock-free reads by specifying + // disableLockFreeReads=false, log a warning so that the user knows these are not + // compatible settings. + if (!storageGlobalParams.disableLockFreeReads) { + LOGV2_WARNING(4788401, + "Lock-free reads is not compatible with " + "enableMajorityReadConcern=false: disabling lock-free reads."); + storageGlobalParams.disableLockFreeReads = true; + } + } + } + + // TODO (SERVER-49464): remove this development only extra logging. + if (storageGlobalParams.disableLockFreeReads) { + LOGV2(4788402, "Lock-free reads is disabled."); + } else { + LOGV2(4788403, "Lock-free reads is enabled."); } if (params.count("replication.oplogSizeMB")) { |