for (Map.Entry<Node, List<ByteArray>> entry: pipelineData.getNodeToKeysMap().entrySet()) {
final Node node = entry.getKey();
final Collection<ByteArray> keys = entry.getValue();
NonblockingStoreCallback callback = new NonblockingStoreCallback() {
public void requestComplete(Object result, long requestTime) {
if (logger.isTraceEnabled())
logger.trace(pipeline.getOperation().getSimpleName()
+ " response received (" + requestTime + " ms.) from node "