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| author | Lingzhi Deng <lingzhi.deng@mongodb.com> | 2020-04-22 15:41:26 -0400 |
|---|---|---|
| committer | Evergreen Agent <no-reply@evergreen.mongodb.com> | 2020-04-23 14:17:43 +0000 |
| commit | 578e8b9e39048c6bf7b47846603b246abc007adc (patch) | |
| tree | 76f2989b47976c92f7ac81387c7171682ee0c180 | |
| parent | 8210db607c1e9c9f6e675d425c29f3b93c9f36f3 (diff) | |
| download | mongo-578e8b9e39048c6bf7b47846603b246abc007adc.tar.gz | |
SERVER-47056: Do not use readOnce cursors for collection scan in initial sync
| -rw-r--r-- | src/mongo/db/repl/collection_cloner.cpp | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/src/mongo/db/repl/collection_cloner.cpp b/src/mongo/db/repl/collection_cloner.cpp index a19c1c694d3..80efca4571e 100644 --- a/src/mongo/db/repl/collection_cloner.cpp +++ b/src/mongo/db/repl/collection_cloner.cpp @@ -543,18 +543,13 @@ void CollectionCloner::_runQuery(const executor::TaskExecutor::CallbackArgs& cal return; } - // readOnce is available on 4.2 sync sources only. Initially we don't know FCV, so - // we won't use the readOnce feature, but once the admin database is cloned we will use it. - // The admin database is always cloned first, so all user data should use readOnce. - const bool readOnceAvailable = serverGlobalParams.featureCompatibility.getVersionUnsafe() == - ServerGlobalParams::FeatureCompatibility::Version::kFullyUpgradedTo42; try { _clientConnection->query( [this, onCompletionGuard](DBClientCursorBatchIterator& iter) { _handleNextBatch(onCompletionGuard, iter); }, NamespaceStringOrUUID(_sourceNss.db().toString(), *_options.uuid), - readOnceAvailable ? QUERY("query" << BSONObj() << "$readOnce" << true) : Query(), + Query(), nullptr /* fieldsToReturn */, QueryOption_NoCursorTimeout | QueryOption_SlaveOk | (collectionClonerUsesExhaust ? QueryOption_Exhaust : 0), |