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我们目前正在评估用于分布式锁定用例的 apache-curator。下面是我们的测试用例：

public class Test { 
    private static CuratorFramework client = CuratorFrameworkFactory.newClient("zook.company.com", new ExponentialBackoffRetry(10,5));

    public static void main(String[] args) {
        client.start();
        int numLocks = 50000;
        int numThreads = 200;
        String[] keyPool = new String[numLocks];
        for (int i = 1; i <= numLocks; i++) {
            keyPool[i - 1] = String.valueOf(100 + i);
        }
        for (int i = 0; i < numThreads; i++) {
            Thread t = new Thread(new Job(numLocks, keyPool));
            t.setName("T" + (i + 1));
            t.start();
        }
    }

    private static class Job implements Runnable {
        private int      numLocks;
        private String[] keyPool;

        public Job(int numLocks, String[] keyPool) {
            this.numLocks = numLocks;
            this.keyPool = keyPool;
        }

        @Override
        public void run() {
            while (true) {
                int l = 0;
                int h = numLocks;
                String lockKey = keyPool[(new Random().nextInt(h - l) + l)];
                InterProcessMutex lock = new InterProcessMutex(client, "/"+lockKey);
                boolean acquired = false;
                String threadName = Thread.currentThread().getName();
                try {
                    long start = System.currentTimeMillis();
                    acquired = lock.acquire(0, TimeUnit.NANOSECONDS);
                    if (acquired) {
                        long end = System.currentTimeMillis();
                        System.out.println("lock acquired in "+ (end - start) + " ms");
                    } else {
                        System.out.println("failed to get lock");
                    }
                } catch (Exception e) {
                    System.out.println(e);
                } finally {
                    if (acquired) {
                        long start = System.currentTimeMillis();
                        lock.release();
                        long end = System.currentTimeMillis();
                        System.out.println("lock released in "+(end - start)+" ms");
                    }
                }
            }
        }
    }
}

该测试在 2G Xmx 的 2 核/7.5G RAM 机器上运行。Zookeeper 实例 ( zook.company.com) 在 4 核/15G RAM 服务器上运行，Xmx 为 12G，maxClientCnxns=5000，tickTime=2000，initLimit=10 和 syncLimit=5。

两台服务器都位于同一个 AWS VPC 中。

在运行 10 分钟的测试时，我们获得80 ms了超过 95% 的锁定尝试的锁定获取时间。虽然获取锁的最大时间是340 ms. 一直在尝试线程数和锁数的不同组合，但时间总是偏高。

无法找到任何地方是否有问题？因为时代似乎太高了。有什么线索吗？？

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