开源客户端curator
(true re de)
curator是Netflix公司开源的一个zookeeper客户端,后捐献给apache,curator框架在zookeeper原生API接口上进行了包装,解决了很多zooKeeper客户端非常底层的细节开发。提供zooKeeper各种应用场景(比如:分布式锁服务、集群领导选举、共享计数器、缓存机制、分布式队列等)的抽象封装,实现了Fluent风格的API接口,是最好用,最流行的zookeeper的客户端。
原生zookeeperAPI的不足:
- 连接对象异步创建,需要开发人员自行编码等待
- 连接没有自动重连超时机制
- watcher一次注册生效一次
- 不支持递归创建树形节点
curator特点:
- 解决session会话超时重连
- watcher反复注册
- 简化开发api
- 遵循Fluent风格的API
- 提供了分布式锁服务、共享计数器、缓存机制等机制
连接
依赖:
<zookeeper.version>3.4.14</zookeeper.version>
<curator.version>2.6.0</curator.version>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
</exclusions>
<version>${zookeeper.version}</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>${curator.version}</version>
<type>jar</type>
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>${curator.version}</version>
<type>jar</type>
</dependency>
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;
public class CuratorConnection {
public static void main(String[] args) {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
CuratorFramework client = CuratorFrameworkFactory.builder()
.connectString("192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:21 83")
.sessionTimeoutMs(5000)
.retryPolicy(retryPolicy)
.namespace("create")
.build();
client.start();
System.out.println(client.isStarted());
client.close();
}
}
新增节点
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.data.Id;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
public class CuratorCreate {
String IP = "192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:2183";
CuratorFramework client;
@Before
public void before() {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
client = CuratorFrameworkFactory
.builder()
.connectString(IP)
.sessionTimeoutMs(5000)
.retryPolicy(retryPolicy)
.namespace("create")
.build();
client.start();
}
@After
public void after() {
client.close();
}
@Test
public void create1() throws Exception {
client.create()
.withMode(CreateMode.PERSISTENT)
.withACL(ZooDefs.Ids.OPEN_ACL_UNSAFE)
.forPath("/node1", "node1".getBytes());
System.out.println("结束");
}
@Test
public void create2() throws Exception {
List<ACL> list = new ArrayList<ACL>();
Id id = new Id("ip", "192.168.60.130");
list.add(new ACL(ZooDefs.Perms.ALL, id));
client.create().withMode(CreateMode.PERSISTENT)
.withACL(list)
.forPath("/node2", "node2".getBytes());
System.out.println("结束");
}
@Test
public void create3() throws Exception {
client.create()
.creatingParentsIfNeeded()
.withMode(CreateMode.PERSISTENT)
.withACL(ZooDefs.Ids.OPEN_ACL_UNSAFE)
.forPath("/node3/node31", "node31".getBytes());
System.out.println("结束");
}
@Test
public void create4() throws Exception {
client.create()
.creatingParentsIfNeeded()
.withMode(CreateMode.PERSISTENT)
.withACL(ZooDefs.Ids.OPEN_ACL_UNSAFE)
.inBackground(new BackgroundCallback() {
@Override
public void processResult(CuratorFramework curatorFramework, CuratorEvent curatorEvent) throws Exception {
System.out.println(curatorEvent.getPath());
System.out.println(curatorEvent.getType());
}
})
.forPath("/node4", "node4".getBytes());
Thread.sleep(5000);
System.out.println("结束");
}
}
更新节点
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class CuratorSet {
String IP = "192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:2183";
CuratorFramework client;
@Before
public void before() {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
client = CuratorFrameworkFactory.builder()
.connectString(IP)
.sessionTimeoutMs(5000)
.retryPolicy(retryPolicy)
.namespace("set")
.build();
client.start();
}
@After
public void after() {
client.close();
}
@Test
public void set1() throws Exception {
client.setData()
.forPath("/node1", "node11".getBytes());
System.out.println("结束");
}
@Test
public void set2() throws Exception {
client.setData()
.withVersion(2)
.forPath("/node1", "node1111".getBytes());
System.out.println("结束");
}
@Test
public void set3() throws Exception {
client.setData()
.withVersion(-1)
.inBackground(new BackgroundCallback() {
@Override
public void processResult(CuratorFramework curatorFramework, CuratorEvent curatorEvent) throws Exception {
System.out.println(curatorEvent.getPath());
System.out.println(curatorEvent.getType());
}
})
.forPath("/node1", "node1".getBytes());
Thread.sleep(5000);
System.out.println("结束");
}
}
删除节点
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class CuratorDelete {
String IP = "192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:2183";
CuratorFramework client;
@Before
public void before() {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
client = CuratorFrameworkFactory.builder().connectString(IP).sessionTimeoutMs(10000).retryPolicy(retryPolicy).namespace("delete").build();
client.start();
}
@After
public void after() {
client.close();
}
@Test
public void delete1() throws Exception {
client.delete()
.forPath("/node1");
System.out.println("结束");
}
@Test
public void delete2() throws Exception {
client.delete()
.withVersion(0)
.forPath("/node1");
System.out.println("结束");
}
@Test
public void delete3() throws Exception {
client.delete()
.deletingChildrenIfNeeded()
.withVersion(-1)
.forPath("/node1");
System.out.println("结束");
}
@Test
public void delete4() throws Exception {
client.delete()
.deletingChildrenIfNeeded()
.withVersion(-1)
.inBackground(new BackgroundCallback() {
@Override
public void processResult(CuratorFramework curatorFramework, CuratorEvent curatorEvent) throws Exception {
System.out.println(curatorEvent.getPath());
System.out.println(curatorEvent.getType());
}
})
.forPath("/node1");
Thread.sleep(5000);
System.out.println("结束");
}
}
查看节点
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.zookeeper.data.Stat;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class CuratorGet {
String IP = "192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:2183";
CuratorFramework client;
@Before
public void before() {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
client = CuratorFrameworkFactory.builder().connectString(IP).sessionTimeoutMs(10000).retryPolicy(retryPolicy).namespace("get").build();
client.start();
}
@After
public void after() {
client.close();
}
@Test
public void get1() throws Exception {
byte[] bys = client.getData()
.forPath("/node1");
System.out.println(new String(bys));
}
@Test
public void get2() throws Exception {
Stat stat = new Stat();
byte[] bys = client.getData()
.storingStatIn(stat)
.forPath("/node1");
System.out.println(new String(bys));
System.out.println(stat.getVersion());
}
@Test
public void get3() throws Exception {
client.getData()
.inBackground(new BackgroundCallback() {
@Override
public void processResult(CuratorFramework curatorFramework, CuratorEvent curatorEvent) throws Exception {
System.out.println(curatorEvent.getPath());
System.out.println(curatorEvent.getType());
System.out.println(new String(curatorEvent.getData()));
}
})
.forPath("/node1");
Thread.sleep(5000);
System.out.println("结束");
}
}
查看子节点
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.zookeeper.data.Stat;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.util.List;
public class CuratorGetChild {
String IP = "192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:2183";
CuratorFramework client;
@Before
public void before() {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
client = CuratorFrameworkFactory.builder().connectString(IP).sessionTimeoutMs(10000).retryPolicy(retryPolicy).build();
client.start();
}
@After
public void after() {
client.close();
}
@Test
public void getChild1() throws Exception {
List<String> list = client.getChildren()
.forPath("/get");
for (String str : list) {
System.out.println(str);
}
}
@Test
public void getChild2() throws Exception {
client.getChildren()
.inBackground(new BackgroundCallback() {
@Override
public void processResult(CuratorFramework curatorFramework, CuratorEvent curatorEvent) throws Exception {
System.out.println(curatorEvent.getPath());
System.out.println(curatorEvent.getType());
List<String> list = curatorEvent.getChildren();
for (String str : list) {
System.out.println(str);
}
}
})
.forPath("/get");
Thread.sleep(5000);
System.out.println("结束");
}
}
检查节点是否存在
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.zookeeper.data.Stat;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class CuratorExists {
String IP = "192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:2183";
CuratorFramework client;
@Before
public void before() {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
client = CuratorFrameworkFactory.builder().connectString(IP).sessionTimeoutMs(10000).retryPolicy(retryPolicy).namespace("get").build();
client.start();
}
@After
public void after() {
client.close();
}
@Test
public void exists1() throws Exception {
Stat stat = client.checkExists()
.forPath("/node2");
System.out.println(stat.getVersion());
}
@Test
public void exists2() throws Exception {
client.checkExists()
.inBackground(new BackgroundCallback() {
@Override
public void processResult(CuratorFramework curatorFramework, CuratorEvent curatorEvent) throws Exception {
System.out.println(curatorEvent.getPath());
System.out.println(curatorEvent.getType());
System.out.println(curatorEvent.getStat().getVersion());
}
})
.forPath("/node2");
Thread.sleep(5000);
System.out.println("结束");
}
}
watcher API
curator提供了两种Watcher(Cache)来监听结点的变化
- Node Cache : 只是监听某一个特定的节点,监听节点的新增和修改
- PathChildren Cache : 监控一个ZNode的子节点. 当一个子节点增加, 更新,删除时, Path Cache会改变它的状态, 会包含最新的子节点, 子节点的数据和状态
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.cache.*;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class CuratorWatcher {
String IP = "192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:2183";
CuratorFramework client;
@Before
public void before() {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
client = CuratorFrameworkFactory.builder().connectString(IP).sessionTimeoutMs(10000).retryPolicy(retryPolicy).build();
client.start();
}
@After
public void after() {
client.close();
}
@Test
public void watcher1() throws Exception {
final NodeCache nodeCache = new NodeCache(client, "/watcher1");
nodeCache.start();
nodeCache.getListenable().addListener(new NodeCacheListener() {
@Override
public void nodeChanged() throws Exception {
System.out.println(nodeCache.getCurrentData().getPath());
System.out.println(new String(nodeCache.getCurrentData().getData()));
}
});
Thread.sleep(100000);
System.out.println("结束");
nodeCache.close();
}
@Test
public void watcher2() throws Exception {
PathChildrenCache pathChildrenCache = new PathChildrenCache(client, "/watcher1", true);
pathChildrenCache.start();
pathChildrenCache.getListenable().addListener(new PathChildrenCacheListener() {
@Override
public void childEvent(CuratorFramework curatorFramework, PathChildrenCacheEvent pathChildrenCacheEvent) throws Exception {
System.out.println(pathChildrenCacheEvent.getType());
System.out.println(pathChildrenCacheEvent.getData().getPath());
System.out.println(new String(pathChildrenCacheEvent.getData().getData()));
}
});
Thread.sleep(100000);
System.out.println("结束");
pathChildrenCache.close();
}
}
事务
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class CuratorTransaction {
String IP = "192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:2183";
CuratorFramework client;
@Before
public void before() {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
client = CuratorFrameworkFactory.builder().connectString(IP).sessionTimeoutMs(10000).retryPolicy(retryPolicy).namespace("create").build();
client.start();
}
@After
public void after() {
client.close();
}
@Test
public void tra1() throws Exception {
client.inTransaction()
.create()
.forPath("node1", "node1".getBytes())
.and()
.create()
.forPath("node2", "node2".getBytes())
.and()
.commit();
}
}
分布式锁
InterProcessMutex:分布式可重入排它锁
InterProcessReadWriteLock:分布式读写锁
import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.cache.*;
import org.apache.curator.framework.recipes.locks.InterProcessLock;
import org.apache.curator.framework.recipes.locks.InterProcessMutex;
import org.apache.curator.framework.recipes.locks.InterProcessReadWriteLock;
import org.apache.curator.framework.recipes.locks.InterProcessSemaphoreMutex;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class CuratorLock {
String IP = "192.168.60.130:2181,192.168.60.130:2182,192.168.60.130:2183";
CuratorFramework client;
@Before
public void before() {
RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
client = CuratorFrameworkFactory.builder().connectString(IP).sessionTimeoutMs(10000).retryPolicy(retryPolicy).build();
client.start();
}
@After
public void after() {
client.close();
}
@Test
public void lock1() throws Exception {
InterProcessLock interProcessLock = new InterProcessMutex(client, "/lock1");
System.out.println("等待获取锁对象!");
interProcessLock.acquire();
for (int i = 1; i <= 10; i++) {
Thread.sleep(3000);
System.out.println(i);
}
interProcessLock.release();
System.out.println("等待释放锁!");
}
@Test
public void lock2() throws Exception {
InterProcessReadWriteLock interProcessReadWriteLock = new InterProcessReadWriteLock(client, "/lock1");
InterProcessLock interProcessLock = interProcessReadWriteLock.readLock();
System.out.println("等待获取锁对象!");
interProcessLock.acquire();
for (int i = 1; i <= 10; i++) {
Thread.sleep(3000);
System.out.println(i);
}
interProcessLock.release();
System.out.println("等待释放锁!");
}
@Test
public void lock3() throws Exception {
InterProcessReadWriteLock interProcessReadWriteLock = new InterProcessReadWriteLock(client, "/lock1");
InterProcessLock interProcessLock = interProcessReadWriteLock.writeLock();
System.out.println("等待获取锁对象!");
interProcessLock.acquire();
for (int i = 1; i <= 10; i++) {
Thread.sleep(3000);
System.out.println(i);
}
interProcessLock.release();
System.out.println("等待释放锁!");
}
}
四字监控命令
zooKeeper支持某些特定的四字命令与其的交互。它们大多是查询命令,用来获取 zooKeeper服务的当前状态及相关信息。用户在客户端可以通过 telnet 或 nc 向zooKeeper提交相应的命令。 zooKeeper常用四字命令见下表所示:
命令 | 描述 |
---|
conf | 输出相关服务配置的详细信息。比如端口、zk数据及日志配置路径、最大连接数,session超时时间、serverId等 |
cons | 列出所有连接到这台服务器的客户端连接/会话的详细信息。包括“接受/发送”的包数量、session id 、操作延迟、最后的操作执行等信息 |
crst | 重置当前这台服务器所有连接/会话的统计信息 |
dump | 列出未经处理的会话和临时节点 |
envi | 输出关于服务器的环境详细信息 |
ruok | 测试服务是否处于正确运行状态。如果正常返回"imok",否则返回空 |
stat | 输出服务器的详细信息:接收/发送包数量、连接数、模式(leader/follower)、节点总数、延迟。 所有客户端的列表 |
srst | 重置server状态 |
wchs | 列出服务器watches的简洁信息:连接总数、watching节点总数和watches总数 |
wchc | 通过session分组,列出watch的所有节点,它的输出是一个与 watch 相关的会话的节点列表 |
wchp | 通过路径分组,列出所有的watch 的session id 信息 |
mntr | 列出集群的健康状态。包括“接受/发送”的包数量、操作延迟、当前服务模式(leader/follower)、节点总数、watch总数、临时节点总数 |
telnet 使用:
telnet 192.168.60.130 2181
nc命令工具安装:
wget http://vault.centos.org/6.6/os/x86_64/Packages/nc-1.84- 22.el6.x86_64.rpm
rpm -iUv nc-1.84-22.el6.x86_64.rpm
使用方式,在shell终端输入:echo mntr(具体命令) | nc localhost 2181
-
conf命令
conf:输出相关服务配置的详细信息
shell终端输入:echo conf | nc localhost 2181
属性 | 含义 |
---|
clientPort | 客户端端口号 |
dataDir | 数据快照文件目录 默认情况下100000次事务操作生成一次快照 |
dataLogDir | 事物日志文件目录,生产环境中放在独立的磁盘上 |
tickTime | 服务器之间或客户端与服务器之间维持心跳的时间间隔(以毫秒为单位) |
maxClientCnxns | 最大连接数 |
minSessionTimeout | 最小session超时 minSessionTimeout=tickTime*2 |
maxSessionTimeout | 最大session超时 maxSessionTimeout=tickTime*20 |
serverId | 服务器编号 |
initLimit | 集群中的follower服务器(F)与leader服务器(L)之间初始连接时能容忍的最多心跳数 |
syncLimit | 集群中的follower服务器(F)与leader服务器(L)之间 请求和应答之间能容忍的最多心跳数 |
electionAlg | 0:基于UDP的LeaderElection;1:基于UDP的FastLeaderElection;2:基于UDP和认证的FastLeaderElection;3: 基于TCP的FastLeaderElection 在3.4.10版本中,默认值为3另外三种算法已经被弃用,并且有计划在之后的版本中将它们彻底删除而不再支持 |
electionPort | 选举端口 |
quorumPort | 数据通信端口 |
peerType | 是否为观察者 1为观察者 |
-
cons命令
cons:列出所有连接到这台服务器的客户端连接/会话的详细信息
shell终端输入:echo cons | nc localhost 2181
属性 | 含义 |
---|
ip | ip地址 |
port | 端口号 |
queued | 等待被处理的请求数,请求缓存在队列中 |
received | 收到的包数 |
sent | 发送的包数 |
sid | 会话id |
lop | 最后的操作 GETD-读取数据 DELE-删除数据 CREA-创建数据 |
est | 连接时间戳 |
to | 超时时间 |
lcxid | 当前会话的操作id |
lzxid | 最大事务id |
lresp | 最后响应时间戳 |
llat | 最后/最新 延时 |
minlat | 最小延时 |
maxlat | 最大延时 |
avglat | 平均延时 |
-
crst命令
crst:重置当前这台服务器所有连接/会话的统计信息
shell终端输入:echo crst| nc localhost 2181
-
dump命令
dump:列出未经处理的会话和临时节点
shell终端输入:echo dump| nc localhost 2181
属性 | 含义 |
---|
session id | znode path(1对多 , 处于队列中排队的session和临时节点) |
-
envi命令
envi:输出关于服务器的环境配置信息
shell终端输入:echo envi| nc localhost 2181
属性 | 含义 |
---|
zookeeper.version | 版本 |
host.name | host 信息 |
java.version | java 版本 |
java.vendor | 供应商 |
java.home | 运行环境所在目录 |
java.class.path | classpath |
java.library.path | 第三方库指定非Java类包的为止(如:dll,so) |
java.io.tmpdir | 默认的临时文件路径 |
java.compiler | JIT 编辑器的名称 |
os.name | Linux |
os.arch | amd64 |
os.version | 3.10.0-1062.el7.x86_64 |
user.name | zookeeper |
user.home | /opt/zookeeper |
user.dir | `/opt/zookeeper/zookeeper2181/bin |
-
ruok命令
ruok:测试服务是否处于正确运行状态
shell终端输入:echo ruok| nc localhost 2181
-
stat命令
stat:输出服务器的详细信息与srvr相似,但是多了每个连接的会话信息
shell终端输入:echo stat| nc localhost 2181
属性 | 含义 |
---|
zookeeper version | 版本 |
Latency min/avg/max | 延时 |
Received | 收包 |
Sent | 发包 |
Connections | 当前服务器连接数 |
Outstanding | 服务器堆积的未处理请求数 |
Zxid | 最大事务id |
Mode | 服务器角色 |
Node count | 节点数 |
-
srst命令
srst:重置server状态
shell终端输入:echo srst| nc localhost 2181
-
wchs命令
wchs:列出服务器watches的简洁信息
shell终端输入:echo wchs| nc localhost 2181
属性 | 含义 |
---|
connectsions | 连接数 |
watch-paths | watch 节点数 |
watchers | watcher 数量 |
-
wchc命令
wchc:通过session分组,列出watch的所有节点,它的输出的是一个与 watch 相关的会话的节点列表问题:
wchc is not executed because it is not in the whitelist
解决办法
else
echo "JMX disabled by user request" >&2
ZOOMAIN="org.apache.zookeeper.server.quorum.QuorumPeerMain"
fi
ZOOMAIN="-Dzookeeper.4lw.commands.whitelist=* ${ZOOMAIN}"
每一个客户端的连接的watcher
信息都会被收集起来,并且监控的路径都会被展示出来(代价高,消耗性能)
[root@localhost bin]
0x171be6c6faf0000
/node2
/node1
0x171be6c6faf0001
/node3
shell终端输入:echo wchc| nc localhost 2181
-
wchp命令
wchp:通过路径分组,列出所有的 watch 的session id信息
问题:
wchp is not executed because it is not in the whitelist.
解决方法:
else
echo "JMX disabled by user request" >&2
ZOOMAIN="org.apache.zookeeper.server.quorum.QuorumPeerMain"
fi
ZOOMAIN="-Dzookeeper.4lw.commands.whitelist=* ${ZOOMAIN}"
shell终端输入:echo wchp| nc localhost 2181
-
mntr命令
列出服务器的健康状态
shell终端输入:echo mntr| nc localhost 2181
属性 | 含义 |
---|
zk_version | 版本 |
zk_avg_latency | 平均延时 |
zk_max_latency | 最大延时 |
zk_min_latency | 最小延时 |
zk_packets_received | 收包数 |
zk_packets_sent | 发包数 |
zk_num_alive_connections | 连接数 |
zk_outstanding_requests | 堆积请求数 |
zk_server_state | leader/follower 状态 |
zk_znode_count | znode 数量 |
zk_watch_count | watch 数量 |
zk_ephemerals_count | l临时节点(znode) |
zk_approximate_data_size | 数据大小 |
zk_open_file_descriptor_count | 打开的文件描述符数量 |
zk_max_file_descriptor_count | 最大文件描述符数量 |
ZooInspector图形化工具
ZooInspector下载地址:
https://issues.apache.org/jira/secure/attachment/12436620/ZooInspector.zip
解压后进入目录ZooInspector\build,运行zookeeper-dev-ZooInspector.jar
java -jar zookeeper-dev-ZooInspector.jar
点击左上角连接按钮,输入zk服务地址:ip或者主机名:2181
之后即可查看ZK节点信息
taokeeper监控工具
基于zookeeper的监控管理工具taokeeper,由淘宝团队开源的zk管理中间件,安装前要求服务前先配置nc 和 sshd
1.下载数据库脚本
wget https://github.com/downloads/alibaba/taokeeper/taokeeper.sql
2.下载主程序
wget https://github.com/downloads/alibaba/taokeeper/taokeeper-monitor.tar.gz
3.下载配置文件
wget https://github.com/downloads/alibaba/taokeeper/taokeeper-monitor-config.properties
4.配置 taokeeper-monitor-config.properties
systemInfo.envName=DAILY
dbcp.driverClassName=com.mysql.jdbc.Driver
dbcp.username=root
dbcp.password=root
dbcp.maxActive=30
dbcp.maxIdle=10
dbcp.maxWait=10000
SystemConstant.userNameOfSSH=zookeeper
SystemConstant.passwordOfSSH=zookeeper
SystemConstant.portOfSSH=22
5.安装配置 tomcat,修改catalina.sh
JAVA_OPTS=-DconfigFilePath="/home/zookeeper/taokeeper-monitor-tomcat/webapps/ROOT/conf/taokeeper-monitor-config.properties"
6.部署工程启动
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)