Example usage for org.apache.hadoop.yarn.conf YarnConfiguration getStrings

Introduction

In this page you can find the example usage for org.apache.hadoop.yarn.conf YarnConfiguration getStrings.

Prototype

public String[] getStrings(String name) 

Source Link

Document

Get the comma delimited values of the name property as an array of Strings.

Usage

From source file:org.apache.slider.core.launch.CredentialUtils.java

License:Apache License

/**
 * Look up and return the resource manager's principal. This method
 * automatically does the <code>_HOST</code> replacement in the principal and
 * correctly handles HA resource manager configurations.
 *
 * From: YARN-4629//w  ww  .java  2  s. c om
 * @param conf the {@link Configuration} file from which to read the
 * principal
 * @return the resource manager's principal string
 * @throws IOException thrown if there's an error replacing the host name
 */
public static String getRMPrincipal(Configuration conf) throws IOException {
    String principal = conf.get(RM_PRINCIPAL, "");
    String hostname;
    Preconditions.checkState(!principal.isEmpty(), "Not set: " + RM_PRINCIPAL);

    if (HAUtil.isHAEnabled(conf)) {
        YarnConfiguration yarnConf = new YarnConfiguration(conf);
        if (yarnConf.get(RM_HA_ID) == null) {
            // If RM_HA_ID is not configured, use the first of RM_HA_IDS.
            // Any valid RM HA ID should work.
            String[] rmIds = yarnConf.getStrings(RM_HA_IDS);
            Preconditions.checkState((rmIds != null) && (rmIds.length > 0), "Not set " + RM_HA_IDS);
            yarnConf.set(RM_HA_ID, rmIds[0]);
        }

        hostname = yarnConf.getSocketAddr(RM_ADDRESS, DEFAULT_RM_ADDRESS, DEFAULT_RM_PORT).getHostName();
    } else {
        hostname = conf.getSocketAddr(RM_ADDRESS, DEFAULT_RM_ADDRESS, DEFAULT_RM_PORT).getHostName();
    }
    return SecurityUtil.getServerPrincipal(principal, hostname);
}

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