Impala实践之六：使用Rest Api

JerryXia 发表于 2017-12-20 23:57:57 , 阅读 (23)

前言

上次的impala状况出现后，决定自己做一套impala的管理系统，那么首先面临的一个问题就是获取impala的各种状态，比如任务执行状态。经过一天多的尝试，总结一下。

hue：可以使用hue的脚本，hue使用python编写，其中有一个beeswax模块，负责任务的执行等。缺点是没发现java的api。
cloudera manager java api：java可以调用cm原生的api，需要导入jar包。跑是跑通了，但是资料太说，目前只能通过这个接口获取集群的基本情况，不想再折腾impala那快了。
cloudera manager 的api：cm提供了rest的api供别人调用，经过接近一天的折腾，跑通了这一块。

Cloudera Manager API

impala相关

和impala相关的api有下面这几个，能用上的主要是最下面带queries的几个接口：

/clusters/{clusterName}/services/{serviceName}/commands/hueSyncDb
/clusters/{clusterName}/services/{serviceName}/commands/impalaCreateCatalogDatabase
/clusters/{clusterName}/services/{serviceName}/commands/impalaCreateCatalogDatabaseTables
/clusters/{clusterName}/services/{serviceName}/commands/impalaCreateUserDir
/clusters/{clusterName}/services/{serviceName}/commands/impalaDisableLlamaHa
/clusters/{clusterName}/services/{serviceName}/commands/impalaDisableLlamaRm
/clusters/{clusterName}/services/{serviceName}/commands/impalaEnableLlamaHa
/clusters/{clusterName}/services/{serviceName}/commands/impalaEnableLlamaRm
/clusters/{clusterName}/services/{serviceName}/impalaQueries
/clusters/{clusterName}/services/{serviceName}/impalaQueries/{queryId}
/clusters/{clusterName}/services/{serviceName}/impalaQueries/{queryId}/cancel
/clusters/{clusterName}/services/{serviceName}/impalaQueries/attributes

调用示例

接口说明：

GET

Returns details about the query. Not all queries have details, check the detailsAvailable field from the getQueries response.

/api/v9/clusters/{clusterName}/services/{serviceName}/impalaQueries/{queryId}

注意：

username:password：是指登录cm的账号和密码
Cluster1：是你的集群的名字
impala：是你的impala服务的名字
364e76f05cdffsdf802b0:3a499cc3fb86bf8afsd：是query的id

curl例子：

curl -u username:password 'clouderamanager.zhdd.com/api/v9/clusters/Cluster1/services/impala/impalaQueries/364e76f05cdffsdf802b0:3a499cc3fb86bf8afsd'

结果：

结果是一个大的json串

java示例：

import org.apache.http.auth.AuthScope;import org.apache.http.auth.UsernamePasswordCredentials;import org.apache.http.client.CredentialsProvider;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.BasicCredentialsProvider;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public class ClientAuthentication {    public static void main(String[] args) throws Exception {        String username = "username";        String password = "password";        CredentialsProvider credsProvider = new BasicCredentialsProvider();        credsProvider.setCredentials(                new AuthScope("clouderamanager.zhdd.com", AuthScope.ANY_PORT),                new UsernamePasswordCredentials(username, password));        CloseableHttpClient httpclient = HttpClients.custom()                .setDefaultCredentialsProvider(credsProvider)                .build();        try {            HttpGet httpget = new HttpGet("http://clouderamanager.zhdd.com/api/v9/clusters/Cluster1/services/impala/impalaQueries/364e76f05cdffsdf802b0:3a499cc3fb86bf8afsd");            System.out.println("Executing request " + httpget.getRequestLine());            CloseableHttpResponse response = httpclient.execute(httpget);            try {                System.out.println("----------------------------------------");                System.out.println(response.getStatusLine());                System.out.println(EntityUtils.toString(response.getEntity()));            } finally {                response.close();            }        } finally {            httpclient.close();        }

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