move to low priority thread

fdbclient/ServerKnobs.cpp

@@ -609,7 +609,7 @@ void ServerKnobs::initialize(Randomize randomize, ClientKnobs* clientKnobs, IsSi
 	init( SHARDED_ROCKSDB_MAX_OPEN_FILES,                      50000 ); // Should be smaller than OS's fd limit.
 	init (SHARDED_ROCKSDB_READ_ASYNC_IO,                       false ); if (isSimulated) SHARDED_ROCKSDB_READ_ASYNC_IO = deterministicRandom()->coinflip();
 	init( SHARDED_ROCKSDB_PREFIX_LEN,                              0 ); if( randomize && BUGGIFY )  SHARDED_ROCKSDB_PREFIX_LEN = deterministicRandom()->randomInt(1, 20);
-
+	init ( SHARDED_ROCKSDB_CLEAR_RANGE_COMPACTION_LIMIT,          10 ); if (isSimulated) SHARDED_ROCKSDB_CLEAR_RANGE_COMPACTION_LIMIT = deterministicRandom()->randomInt(0, 100); 
 
 	// Leader election
 	bool longLeaderElection = randomize && BUGGIFY;

fdbclient/include/fdbclient/IKeyValueStore.actor.h

@@ -85,6 +85,11 @@ class IKeyValueStore : public IClosable {
 	// Adds key range to a physical shard.
 	virtual Future<Void> addRange(KeyRangeRef range, std::string id, bool active = true) { return Void(); }
 
+	// Creates new physical shards for key ranges.
+	virtual Future<Void> addRanges(std::vector<std::pair<KeyRange, std::string>> ranges, bool active = true) {
+		return Void();
+	}
+
 	// Removes a key range from KVS and returns a list of empty physical shards after the removal.
 	virtual std::vector<std::string> removeRange(KeyRangeRef range) { return std::vector<std::string>(); }
 

fdbclient/include/fdbclient/ServerKnobs.h

@@ -573,6 +573,7 @@ class SWIFT_CXX_IMMORTAL_SINGLETON_TYPE ServerKnobs : public KnobsImpl<ServerKno
 	int SHARDED_ROCKSDB_MAX_OPEN_FILES;
 	bool SHARDED_ROCKSDB_READ_ASYNC_IO;
 	int SHARDED_ROCKSDB_PREFIX_LEN;
+	int SHARDED_ROCKSDB_CLEAR_RANGE_COMPACTION_LIMIT;
 
 	// Leader election
 	int MAX_NOTIFICATIONS;