SERVER-19212 Hide indexes and collections from stale majority concern reads

Reading from a collection will error out if the snapshot used by the query is
older than the collection creation or the point when the last index was
dropped from a collection.

New indexes do not cause reads to fail, but reads cannot use the new indexes
since they may be incomplete in the snapshot.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/mongo/db/db_raii.cpp b/src/mongo/db/db_raii.cpp
index 9cf314c7b76..dabc86ad475 100644
--- a/src/mongo/db/db_raii.cpp
+++ b/src/mongo/db/db_raii.cpp
@@ -31,6 +31,7 @@
 #include "mongo/db/db_raii.h"
 
 #include "mongo/db/catalog/database_holder.h"
+#include "mongo/db/catalog/collection.h"
 #include "mongo/db/client.h"
 #include "mongo/db/curop.h"
 #include "mongo/db/stats/top.h"
@@ -97,6 +98,18 @@ void AutoGetCollectionForRead::_init(const std::string& ns, StringData coll) {
 
         _coll = _db.getDb()->getCollection(ns);
     }
+
+    if (_coll) {
+        if (auto minSnapshot = _coll->getMinimumVisibleSnapshot()) {
+            if (auto mySnapshot = _txn->recoveryUnit()->getMajorityCommittedSnapshot()) {
+                uassert(ErrorCodes::ReadConcernMajorityNotAvailableYet,
+                        str::stream()
+                            << "Majority read concern is not currently available for collection "
+                            << ns,
+                        mySnapshot >= minSnapshot);
+            }
+        }
+    }
 }
 
 AutoGetCollectionForRead::~AutoGetCollectionForRead() {