ExecutorType.CONCRETE);
responseExecutor = new ThreadPoolExecutor(1, 1,
0L, TimeUnit.MILLISECONDS,
responseWorkQueue,
new SingleExecutorThreadFactory(node.threadGroup,
node.getConfigClassLoader(), node.getThreadNamePrefix("response")));
executingCalls = new ConcurrentHashMap<RemoteCallKey, RemoteCallKey>(1000, 0.75f, concurrencyLevel);
backupCalls = new ConcurrentHashMap<Long, BackupCompletionCallback>(1000, 0.75f, concurrencyLevel);