问题描述
我正在尝试在 Zookeeper 中创建一个“目录”,如下所示:
curatorFramework = CuratorFrameworkFactory.newClient(
"ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181",zkInfo.getSessionTimeoutMs(),zkInfo.getConnectionTimeoutMs(),new RetryNTimes(zkInfo.getRetryAttempts(),zkInfo.getRetryIntervalMs())
);
curatorFramework.start();
byte[] byteArray = new byte[1];
byteArray[0] = (byte) 7;
curatorFramework.create()
.withMode(CreateMode.PERSISTENT)
.withACL(ZooDefs.Ids.OPEN_ACL_UNSAFE)
.forPath("/my_node",byteArray);
令人困惑的是,它在我试图创建的节点上给了我一个“NoNodeException”。
Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /my_node
at org.apache.zookeeper.KeeperException.create(KeeperException.java:111) ~[stormjar.jar:?]
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) ~[stormjar.jar:?]
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783) ~[stormjar.jar:?]
at org.apache.curator.framework.imps.CreateBuilderImpl$17.call(CreateBuilderImpl.java:1176) ~[stormjar.jar:?]
at org.apache.curator.framework.imps.CreateBuilderImpl$17.call(CreateBuilderImpl.java:1156) ~[stormjar.jar:?]
at org.apache.curator.connection.StandardConnectionHandlingPolicy.callWithRetry(StandardConnectionHandlingPolicy.java:64) ~[stormjar.jar:?]
at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:100) ~[stormjar.jar:?]
at org.apache.curator.framework.imps.CreateBuilderImpl.pathInForeground(CreateBuilderImpl.java:1153) ~[stormjar.jar:?]
at org.apache.curator.framework.imps.CreateBuilderImpl.protectedPathInForeground(CreateBuilderImpl.java:607) ~[stormjar.jar:?]
at org.apache.curator.framework.imps.CreateBuilderImpl.forPath(CreateBuilderImpl.java:597) ~[stormjar.jar:?]
at org.apache.curator.framework.imps.CreateBuilderImpl$3.forPath(CreateBuilderImpl.java:362) ~[stormjar.jar:?]
at org.apache.curator.framework.imps.CreateBuilderImpl$3.forPath(CreateBuilderImpl.java:310) ~[stormjar.jar:?]
请注意,我可以连接到 Zookeeper:
Socket connection established to ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181,initiating session
Session establishment complete on server ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181,sessionid = 0x100000363b13354,negotiated timeout = 20000
请注意,Zookeeper 服务器在远程机器上,并且此帖子中的 ip(“111.11.111.1”)已更改。
解决方法
所以我尝试用 zkCli 连接,发现是我的 connectString 有问题:
/opt/zookeeper-3.6.1/bin/zkCli.sh -server ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181
Welcome to ZooKeeper!
[myid:ip-111-11-111-1.us-west-2.compute.internal:2181] - INFO [main-SendThread(ip-111-11-111-1.us-west-2.compute.internal:2181):ClientCnxn$SendThread@1154] - Opening socket connection to server ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181.
[myid:ip-111-11-111-1.us-west-2.compute.internal:2181] - INFO [main-SendThread(ip-111-11-111-1.us-west-2.compute.internal:2181):ClientCnxn$SendThread@986] - Socket connection established,initiating session,client: /111.11.111.2:43736,server: ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181
[myid:ip-111-11-111-1.us-west-2.compute.internal:2181] - INFO [main-SendThread(ip-111-11-111-1.us-west-2.compute.internal:2181):ClientCnxn$SendThread@1420] - Session establishment complete on server ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181,session id = 0x100000363b1d2e8,negotiated timeout = 30000
[zk: ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181(CONNECTED) 0] ls /
Node does not exist: /
[zk: ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181(CONNECTED) 1] create /my_node
Node does not exist: /my_node
如您所见,在 zkCli 中尝试创建节点会导致 NoNode 错误。
事实证明 ip-111-11-111-1.us-west-2.compute.internal/111.11.111.1:2181
不是一个正确的连接字符串,但我很困惑,因为 zkCli 允许我连接到它。
似乎与 ACL 相关,可以肯定的是,您可以手动创建它。
找到您本地的 zk 二进制文件(不需要在远程主机上)并启动指向您的服务器的客户端 (zkCli
)。连接后,创建新的 znode:
bin/zkCli.sh -server 111.11.111.1:2181
[zkshell:x] create /my_node
>>Created /mynode
shell 应该输出最后一句,以保证节点已经创建。完成后,再次启动 Curator 进程。
查看 here 以了解有关 zk 客户端的更多详细信息。