Example usage for org.apache.hadoop.ha HAServiceTarget getProxy

Introduction

In this page you can find the example usage for org.apache.hadoop.ha HAServiceTarget getProxy.

Prototype

public HAServiceProtocol getProxy(Configuration conf, int timeoutMs) throws IOException 

Source Link

Usage

From source file:co.cask.cdap.operations.hdfs.HDFSInfo.java

License:Apache License

@Nullable
private URL getHAWebURL() throws IOException {
    String activeNamenode = null;
    String nameService = getNameService();
    HdfsConfiguration hdfsConf = new HdfsConfiguration(conf);
    String nameNodePrincipal = conf.get(DFSConfigKeys.DFS_NAMENODE_USER_NAME_KEY, "");

    hdfsConf.set(CommonConfigurationKeys.HADOOP_SECURITY_SERVICE_USER_NAME_KEY, nameNodePrincipal);

    for (String nnId : DFSUtil.getNameNodeIds(conf, nameService)) {
        HAServiceTarget haServiceTarget = new NNHAServiceTarget(hdfsConf, nameService, nnId);
        HAServiceProtocol proxy = haServiceTarget.getProxy(hdfsConf, 10000);
        HAServiceStatus serviceStatus = proxy.getServiceStatus();
        if (HAServiceProtocol.HAServiceState.ACTIVE != serviceStatus.getState()) {
            continue;
        }/*from   w ww .  j a  v a  2s . c  om*/
        activeNamenode = DFSUtil.getNamenodeServiceAddr(hdfsConf, nameService, nnId);
    }
    if (activeNamenode == null) {
        throw new IllegalStateException("Could not find an active namenode");
    }
    return rpcToHttpAddress(URI.create(activeNamenode));
}

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