presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorSplitManager.java/RaptorSplitManager/RaptorSplitManager
class RaptorSplitManager:    public RaptorSplitManager(RaptorConnectorId connectorId, NodeSupplier nodeSupplier, ShardManager shardManager, boolean backupAvailable)
    {
        this.nodeSupplier = requireNonNull(nodeSupplier, "nodeSupplier is null");
        this.shardManager = requireNonNull(shardManager, "shardManager is null");
        this.backupAvailable = backupAvailable;
        this.executor = newCachedThreadPool(daemonThreadsNamed("raptor-split-" + connectorId + "-%s"));
    }