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Azkaban使用示例
1、Web端管理工作流
Azkaban提供了易操作的Web管理界面，具体操作可参考：http://azkaban.github.io/azkaban/docs/2.5/#ajax-api
值得注意的是，可以使用Azkaban提供的Web界面，定义或覆盖工作流的具体执行参数，操作界面如下：
2.1、登录认证
命令：curl -k -X POST --data "action=login&username=azkaban&password=azkaban" https://localhost:8443
返回json格式：
<span style="white-space:pre"> </span>{
"status" : "success",
"session.id" : "c001aba5-a90f-4daf-8f11-62330d034c0a"
}2.2、创建一个Project
命令：curl -k -X POST --data "session.id=9089beb2-576d-47e3-b040-86dbdc7f523e&name=aaaa&description=11" https://localhost:8443/manager?action=create
返回json格式：
<span style="white-space:pre"> </span>{
"status":"success",
"path":"manager?project=aaaa",
"action":"redirect"
} 2.3、上传一个Project的zip文件
命令：curl -k -i -H "Content-Type: multipart/mixed" -X POST --form ‘session.id=e7a29776-5783-49d7-afa0-b0e688096b5e‘ --form ‘ajax=upload‘ --form ‘file=@myproject.zip;type=application/zip‘ --form ‘project=MyProject‘ https://localhost:8443/manager
注意：在zip文件的目录下执行该命令，否则无法找到zip文件
返回json格式：
<span style="white-space:pre"> </span>{
"error" : "Installation Failed.\nError unzipping file.",
"projectId" : "192",
"version" : "1"
}2.4、执行工作流
命令：curl -k --get --data ‘session.id=189b956b-f39f-421e-9a95-e3117e7543c9‘ --data ‘ajax=executeFlow‘ --data ‘project=azkaban-test-project‘ --data ‘flow=test‘ https://localhost:8443/executor
返回json格式：
<span style="white-space:pre"> </span>{
message: "Execution submitted successfully with exec id 295",
project: "foo-demo",
flow: "test",
execid: 295
}3、使用Ajax API操作工作流
在程序中执行工作流的话，则需要使用Azkaban提供的ajax api了，以下是使用Java模拟https请求的代码：
AzkabanHttpsPost类
package hadoop.azkaban;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.util.Properties;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManagerFactory;
import net.sf.json.JSONObject;
public class AzkabanHttpsPost {
static String keystorePassword;
static String keystore;
static String truststore;
static{
InputStream is=Thread.currentThread().getContextClassLoader().
getResourceAsStream("azkaban.properties");
Properties p=new Properties();
try{
p.load(is);
keystorePassword = p.getProperty("PASSWORD");
keystore = p.getProperty("KEYSTORE");
truststore = p.getProperty("TRUSTSTORE");
}catch(Exception e){
e.printStackTrace();
}
}
/**
* 获得KeyStore.
*
* @param storePath
* 密钥库路径
* @param password
* 密码
* @return 密钥库
* @throws Exception
*/
public static KeyStore getKeyStore(String password, String storePath)
throws Exception {
// 实例化密钥库
KeyStore ks = KeyStore.getInstance("JKS");
// 获得密钥库文件流
FileInputStream is = new FileInputStream(storePath);
// 加载密钥库
ks.load(is, password.toCharArray());
// 关闭密钥库文件流
is.close();
return ks;
}
/**
* 获得SSLSocketFactory.
*
* @param password
* 密码
* @param keyStorePath
* 密钥库路径
* @param trustStorePath
* 信任库路径
* @return SSLSocketFactory
* @throws Exception
*/
public static SSLContext getSSLContext() throws Exception {
// 实例化密钥库
KeyManagerFactory keyManagerFactory = KeyManagerFactory
.getInstance(KeyManagerFactory.getDefaultAlgorithm());
// 获得密钥库
KeyStore keyStore = getKeyStore(AzkabanHttpsPost.keystorePassword, AzkabanHttpsPost.keystore);
// 初始化密钥工厂
keyManagerFactory.init(keyStore, AzkabanHttpsPost.keystorePassword.toCharArray());
// 实例化信任库
TrustManagerFactory trustManagerFactory = TrustManagerFactory
.getInstance(TrustManagerFactory.getDefaultAlgorithm());
// 获得信任库
KeyStore trustStore = getKeyStore(AzkabanHttpsPost.keystorePassword, AzkabanHttpsPost.truststore);
// 初始化信任库
trustManagerFactory.init(trustStore);
// 实例化SSL上下文
SSLContext ctx = SSLContext.getInstance("TLS");
// 初始化SSL上下文
ctx.init(keyManagerFactory.getKeyManagers(),
trustManagerFactory.getTrustManagers(), null);
// 获得SSLSocketFactory
return ctx;
}
/**
* 初始化HttpsURLConnection.
*
* @param password
* 密码
* @param keyStorePath
* 密钥库路径
* @param trustStorePath
* 信任库路径
* @throws Exception
*/
public static void initHttpsURLConnection() throws Exception {
// 声明SSL上下文
SSLContext sslContext = null;
// 实例化主机名验证接口
HostnameVerifier hnv = new MyHostnameVerifier();
try {
sslContext = getSSLContext();
} catch (GeneralSecurityException e) {
e.printStackTrace();
}
if (sslContext != null) {
HttpsURLConnection.setDefaultSSLSocketFactory(sslContext
.getSocketFactory());
}
HttpsURLConnection.setDefaultHostnameVerifier(hnv);
}
/**
* 发送请求.
*
* @param httpsUrl
* 请求的地址,如https://localhost:8043
* @param xmlStr
* 请求的数据,如action=login&username=azkaban&password=azkaban
* @throws Exception
*/
public static JSONObject post(String url,String xmlStr) throws Exception {
initHttpsURLConnection();
JSONObject jsonObj = null;
HttpsURLConnection urlCon = null;
try {
urlCon = (HttpsURLConnection) (new URL(url)).openConnection();
urlCon.setDoInput(true);
urlCon.setDoOutput(true);
urlCon.setRequestMethod("POST");
// 如下设置后，azkaban才能识别出是以ajax的方式访问，从而返回json格式的操作信息
urlCon.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
urlCon.setRequestProperty("X-Requested-With", "XMLHttpRequest");
urlCon.setUseCaches(true);
// 设置为gbk可以解决服务器接收时读取的数据中文乱码问题
urlCon.getOutputStream().write(xmlStr.getBytes("gbk"));
urlCon.getOutputStream().flush();
urlCon.getOutputStream().close();
BufferedReader in = new BufferedReader(new InputStreamReader(
urlCon.getInputStream()));
String line="";
String temp;
while ((temp = in.readLine()) != null) {
line = line + temp;
}
jsonObj = JSONObject.fromObject(line);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return jsonObj;
}MyHostnameVerifier类
package hadoop.azkaban;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLSession;
/**
* 实现用于主机名验证的基接口。
* 在握手期间，如果 URL 的主机名和服务器的标识主机名不匹配，则验证机制可以回调此接口的实现程序来确定是否应该允许此连接。
*/
public class MyHostnameVerifier implements HostnameVerifier {
@Override
public boolean verify(String hostname, SSLSession session) {
if("localhost".equals(hostname)){
return true;
} else {
return false;
}
}
} 以下是调用https，操作Azkaban的示例：
package hadoop.azkaban;
import java.io.InputStream;
import java.util.Properties;
import net.sf.json.JSONObject;
/**
*
* @author hu
*
*/
public class AzkabanOperator {
public static String url;
public static String azkabanUser;
public static String azkabanPassword;
public static String GDI_Project;
public static String GDI_Workflow;
static {
InputStream is = Thread.currentThread().getContextClassLoader()
.getResourceAsStream("azkaban.properties");
Properties p = new Properties();
try {
p.load(is);
url = p.getProperty("URL");
azkabanUser = p.getProperty("AZKABANUSER");
azkabanPassword = p.getProperty("AZKABANPASSWORD");
GDI_Project = p.getProperty("GDI_Project");
GDI_Workflow = p.getProperty("GDI_Workflow");
} catch (Exception e) {
e.printStackTrace();
}
}
public JSONObject login() throws Exception {
JSONObject result = null;
String queryStr = "action=login&username=" + azkabanUser + "&password="
+ azkabanPassword;
result = AzkabanHttpsPost.post(url, queryStr);
return result;
}
public JSONObject executeGDIFlow(String sessionID, String project,
String flow, String cwParams, String smParams, String gdiParams)
throws Exception {
JSONObject result = null;
String executeStr = "session.id=" + sessionID
+ "&ajax=executeFlow&project=" + project + "&flow=" + flow
+ "&flowOverride[cw_params]=" + cwParams
+ "&flowOverride[sm_params]=" + smParams
+ "&flowOverride[gdi_params]=" + gdiParams;
String executeUrl = url + "/executor";
result = AzkabanHttpsPost.post(executeUrl, executeStr);
return result;
}
public JSONObject fetchFlow(String sessionID, String execID)
throws Exception {
JSONObject result = null;
String executeStr = "session.id=" + sessionID
+ "&ajax=fetchexecflow&execid=" + execID;
String executeUrl = url + "/executor";
result = AzkabanHttpsPost.post(executeUrl, executeStr);
return result;
}Azkaban使用示例
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