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

Introduction

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

Prototype

public String[] getTrimmedStrings(String name) 

Source Link

Document

Get the comma delimited values of the name property as an array of Strings, trimmed of the leading and trailing whitespace.

Usage

From source file:org.apache.reef.runtime.yarn.YarnClasspathProvider.java

License:Apache License

@Inject
YarnClasspathProvider(final YarnConfiguration yarnConfiguration) {
    boolean needsLegacyClasspath = false; // will be set to true below whenever we encounter issues with the YARN Configuration
    final ClassPathBuilder builder = new ClassPathBuilder();

    try {//from ww w  . j a va  2s . c o m
        // Add the classpath actually configured on this cluster
        final String[] yarnClassPath = yarnConfiguration
                .getTrimmedStrings(YarnConfiguration.YARN_APPLICATION_CLASSPATH);
        if (null == yarnClassPath || yarnClassPath.length == 0) {
            needsLegacyClasspath = true;
        } else {
            builder.addAll(yarnClassPath);
        }
        final String[] yarnDefaultClassPath = YarnConfiguration.DEFAULT_YARN_CROSS_PLATFORM_APPLICATION_CLASSPATH;
        if (null == yarnDefaultClassPath || yarnDefaultClassPath.length == 0) {
            LOG.log(Level.SEVERE,
                    "YarnConfiguration.DEFAULT_YARN_CROSS_PLATFORM_APPLICATION_CLASSPATH is empty. This indicates a broken cluster configuration");
            needsLegacyClasspath = true;
        } else {
            builder.addAll(yarnDefaultClassPath);
        }
    } catch (final NoSuchFieldError e) {
        // This means that one of the static fields above aren't actually in YarnConfiguration.
        // The reason for that is most likely that we encounter a really old version of YARN.
        needsLegacyClasspath = true;
        LOG.log(Level.SEVERE, YARN_TOO_OLD_MESSAGE);
    }

    if (needsLegacyClasspath) {
        builder.addAll(LEGACY_CLASSPATH_LIST);
    }

    this.classPathPrefix = builder.getPrefixAsImmutableList();
    this.classPathSuffix = builder.getSuffixAsImmutableList();
    this.logClasspath();
}

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