ClusterSpec clusterSpec = entry.getValue().getClusterSpec();
final StatementBuilder statementBuilder = entry.getValue().getStatementBuilder();
ComputeServiceContext computeServiceContext = getCompute().apply(clusterSpec);
final ComputeService computeService = computeServiceContext.getComputeService();
Credentials credentials = new Credentials(clusterSpec.getIdentity(), clusterSpec.getCredential());
if (numberAllocated == 0) {
for (ComputeMetadata compute : computeService.listNodes()) {
if (!(compute instanceof NodeMetadata)) {
throw new IllegalArgumentException("Not an instance of NodeMetadata: " + compute);