Example usage for org.apache.hadoop.fs Path hashCode

Introduction

In this page you can find the example usage for org.apache.hadoop.fs Path hashCode.

Prototype

@Override
    public int hashCode() 

Source Link

Usage

From source file:oracle.kv.hadoop.hive.table.TableHiveInputSplit.java

License:Open Source License

@Override
public int hashCode() {

    int hc = 0;//from w  w w. j  a v a 2s .co m
    final Path filePath = getPath();
    if (filePath != null) {
        hc = filePath.hashCode();
    }

    return hc + v2Split.hashCode();
}

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From source file:org.apache.jena.hadoop.rdf.io.input.util.RdfIOUtils.java

License:Apache License

/**
 * Selects a seed for use in generating blank node identifiers
 * //from w w  w  .j  ava  2 s . com
 * @param context
 *            Job Context
 * @param path
 *            File path
 * @return Seed
 */
public static UUID getSeed(JobContext context, Path path) {
    // This is to ensure that blank node allocation policy is constant when
    // subsequent MapReduce jobs need that
    String jobId = context.getJobID().toString();
    if (jobId == null) {
        jobId = String.valueOf(System.currentTimeMillis());
        LOGGER.warn(
                "Job ID was not set, using current milliseconds of {}. Sequence of MapReduce jobs must carefully handle blank nodes.",
                jobId);
    }

    if (!context.getConfiguration().getBoolean(RdfIOConstants.GLOBAL_BNODE_IDENTITY, false)) {
        // Using normal file scoped blank node allocation
        LOGGER.debug("Generating Blank Node Seed from Job Details (ID={}, Input Path={})", jobId, path);

        // Form a reproducible seed for the run
        return new UUID(jobId.hashCode(), path.hashCode());
    } else {
        // Using globally scoped blank node allocation
        LOGGER.warn(
                "Using globally scoped blank node allocation policy from Job Details (ID={}) - this is unsafe if your RDF inputs did not originate from a previous job",
                jobId);

        return new UUID(jobId.hashCode(), 0);
    }
}

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