SERVER-13951 Split index building in to UnitOfWork-sized stages

All index builds now go through the MultiIndexBuilder as its API was already
close to ideal. The following tickets have also been addressed by this commit:

SERVER-14710 Remove dropDups
SERVER-12309 Cloner build indexes in parallel
SERVER-14737 Initial sync uses bg index building
SERVER-9135 fast index build for initial sync
SERVER-2747 can't kill index in phase 2
SERVER-8917 check error code rather than assuming all errors are dups
SERVER-14820 compact enforces unique while claiming not to
SERVER-14746 IndexRebuilder should be foreground and fail fatally

1 files changed, 5 insertions, 25 deletions

diff --git a/src/mongo/db/index_rebuilder.h b/src/mongo/db/index_rebuilder.h
index 71e8bd55952..4fd59b14966 100644
--- a/src/mongo/db/index_rebuilder.h
+++ b/src/mongo/db/index_rebuilder.h
@@ -28,31 +28,11 @@
 
 #pragma once
 
-#include <list>
-#include <string>
-
-#include "mongo/util/background.h"
-
 namespace mongo {
 
-    class OperationContext;
-
-    // This is a job that's only run at startup. It finds all incomplete indices and 
-    // finishes rebuilding them. After they complete rebuilding, the thread terminates. 
-    class IndexRebuilder : public BackgroundJob {
-    public:
-        IndexRebuilder();
-
-        std::string name() const;
-        void run();
-
-    private:
-        /**
-         * Check each collection in the passed in list to see if it has any in-progress index
-         * builds that need to be retried.  If so, calls retryIndexBuild.
-         */
-        void checkNS(OperationContext* txn, const std::list<std::string>& nsToCheck);
-    };
-
-    extern IndexRebuilder indexRebuilder;
+    /**
+     * Restarts building indexes that were in progress during shutdown.
+     * Only call this at startup before taking requests.
+     */
+    void restartInProgressIndexesFromLastShutdown();
 }