我正在运行一个简单的演示，使用java zookeeper客户端连接zookeeper服务器。在windows上连接成功需要很长时间（至少10秒），但在linux上连接成功非常快。原因是什么？如何处理？非常感谢。

软件版本：

OS：win11有两个虚拟机，一个是ubuntu服务器，另一个是ubuntu桌面，
Java：开放式JDK11，
zookeeper服务器：版本3.7.0，部署在ubuntu虚拟机上
演示代码：

public static void main(String[] args) throws Exception {
    log.info("begin connect to zookeeper ================================>>");
    ZooKeeper zooKeeper = new ZooKeeper("192.168.1.16", 30000, watchedEvent -> {
    });
    log.info("connect zookeeper success =================================>>");
    zooKeeper.close();
    log.info("zookeeper is closed...");
}

结果和日志：

1.在Win11上运行演示代码：

[04-04-22 11:57:32:013 CST] main  INFO provider.ProviderStartup: begin connect to zookeeper ================================>>
[04-04-22 11:57:41:087 CST] main  INFO zookeeper.ZooKeeper: Client environment:zookeeper.version=3.7.0-e3704b390a6697bfdf4b0bef79e3da7a4f6bac4b, built on 2021-03-17 09:46 UTC
[04-04-22 11:57:41:087 CST] main  INFO zookeeper.ZooKeeper: Client environment:java.version=11
[04-04-22 11:57:41:088 CST] main  INFO zookeeper.ZooKeeper: Client environment:java.home=D:\jdk-11
[04-04-22 11:57:41:088 CST] main  INFO zookeeper.ZooKeeper: Client environment:os.name=Windows 10
[04-04-22 11:57:41:088 CST] main  INFO zookeeper.ZooKeeper: Client environment:os.arch=amd64
[04-04-22 11:57:41:088 CST] main  INFO zookeeper.ZooKeeper: Client environment:os.version=10.0
[04-04-22 11:57:41:096 CST] main  INFO zookeeper.ZooKeeper: Initiating client connection, connectString=192.168.1.16 sessionTimeout=30000 watcher=com.gonnaup.dubbo.provider.ProviderStartup$$Lambda$29/0x00000008000dc840@799d4f69
[04-04-22 11:57:41:102 CST] main  INFO common.X509Util: Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation
[04-04-22 11:57:41:384 CST] main  INFO zookeeper.ClientCnxnSocket: jute.maxbuffer value is 1048575 Bytes
[04-04-22 11:57:41:393 CST] main  INFO zookeeper.ClientCnxn: zookeeper.request.timeout value is 0. feature enabled=false
[04-04-22 11:57:41:393 CST] main  INFO provider.ProviderStartup: connect zookeeper success =================================>>
[04-04-22 11:57:59:472 CST] main-SendThread(192.168.1.16:2181)  INFO zookeeper.ClientCnxn: Opening socket connection to server 192.168.1.16/192.168.1.16:2181.
[04-04-22 11:57:59:473 CST] main-SendThread(192.168.1.16:2181)  INFO zookeeper.ClientCnxn: SASL config status: Will not attempt to authenticate using SASL (unknown error)
[04-04-22 11:57:59:476 CST] main-SendThread(192.168.1.16:2181)  INFO zookeeper.ClientCnxn: Socket connection established, initiating session, client: /192.168.1.8:2474, server: 192.168.1.16/192.168.1.16:2181
[04-04-22 11:57:59:596 CST] main  INFO provider.ProviderStartup: zookeeper is closed...
[04-04-22 11:57:59:596 CST] main-EventThread  INFO zookeeper.ClientCnxn: EventThread shut down for session: 0x100001dd5b40058

我省略了一些无用的日志，以减少字数，从日志记录时间可以看出，从连接到结束需要很长时间（参见'====〉〉'标志）。
1.在ubuntu桌面虚拟机上运行演示代码：

[04-04-22 11:57:03:739 CST] main  INFO simple.ZookeeperCli: begin connect to zookeeper ================================>>
[04-04-22 11:57:03:785 CST] main  INFO zookeeper.ZooKeeper: Client environment:zookeeper.version=3.7.0-e3704b390a6697bfdf4b0bef79e3da7a4f6bac4b, built on 2021-03-17 09:46 UTC
[04-04-22 11:57:03:786 CST] main  INFO zookeeper.ZooKeeper: Client environment:java.version=11.0.14.1
[04-04-22 11:57:03:788 CST] main  INFO zookeeper.ZooKeeper: Client environment:os.name=Linux
[04-04-22 11:57:03:788 CST] main  INFO zookeeper.ZooKeeper: Client environment:os.arch=amd64
[04-04-22 11:57:03:788 CST] main  INFO zookeeper.ZooKeeper: Client environment:os.version=5.13.0-39-generic
[04-04-22 11:57:03:800 CST] main  INFO zookeeper.ZooKeeper: Initiating client connection, connectString=192.168.1.16 sessionTimeout=30000 watcher=cn.gonnaup.simple.ZookeeperCli$$Lambda$31/0x0000000840083040@47f37ef1
[04-04-22 11:57:03:808 CST] main  INFO common.X509Util: Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation
[04-04-22 11:57:03:818 CST] main  INFO zookeeper.ClientCnxnSocket: jute.maxbuffer value is 1048575 Bytes
[04-04-22 11:57:03:838 CST] main  INFO zookeeper.ClientCnxn: zookeeper.request.timeout value is 0. feature enabled=false
[04-04-22 11:57:03:849 CST] main  INFO simple.ZookeeperCli: connect zookeeper success =================================>>
[04-04-22 11:57:03:941 CST] main-SendThread(192.168.1.16:2181)  INFO zookeeper.ClientCnxn: Opening socket connection to server 192.168.1.16/192.168.1.16:2181.
[04-04-22 11:57:03:943 CST] main-SendThread(192.168.1.16:2181)  INFO zookeeper.ClientCnxn: SASL config status: Will not attempt to authenticate using SASL (unknown error)
[04-04-22 11:57:03:964 CST] main-SendThread(192.168.1.16:2181)  INFO zookeeper.ClientCnxn: Socket connection established, initiating session, client: /10.0.2.15:56596, server: 192.168.1.16/192.168.1.16:2181
[04-04-22 11:57:04:109 CST] main  INFO zookeeper.ZooKeeper: Session: 0x100001dd5b40057 closed
[04-04-22 11:57:04:109 CST] main  INFO simple.ZookeeperCli: zookeeper is closed...
[04-04-22 11:57:04:109 CST] main-EventThread  INFO zookeeper.ClientCnxn: EventThread shut down for session: 0x100001dd5b40057

可以看到连接Zookeeper和关闭连接是立即完成。

2条答案

按热度按时间

1tuwyuhd1#

我不能说这是你的问题，但你有某种类型的防病毒软件运行在Windows机器上，扫描jar文件的访问？我遇到过这个问题在过去的一个服务器上，其中一个防病毒更新导致所有Zookeeper连接从不到一秒的连接到大约60秒，而按访问扫描程序正在检查所有的jar文件被接触/加载，包括Zookeeper和JVM库。如果你有防病毒软件，你可以在运行连接测试时暂时禁用它，至少排除这种可能性。

赞(0）回复(0）举报 2022-12-09

7cwmlq892#

通过调试Zookeeper的源代码，我终于发现了这个问题。在JVM示例化Zookeeper对象之前，它执行了Zookeeper.class中的静态块，加载了您的环境。有一个方法InetAddress.getLocalHost().getCanonicalHostName()使代码运行缓慢。我在getcanonicalhostname-is-very-slow中找到了解决方法。这就是Npcap Loopback Adapter导致执行缓慢的原因。

为什么连接Zookeeper要花很长时间在窗口上？

2条答案

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