Example usage for org.apache.hadoop.hdfs.security.token.delegation DelegationTokenIdentifier getIssueDate

Introduction

In this page you can find the example usage for org.apache.hadoop.hdfs.security.token.delegation DelegationTokenIdentifier getIssueDate.

Prototype

public long getIssueDate() 

Source Link

Usage

From source file:co.cask.cdap.app.runtime.spark.SparkCredentialsUpdater.java

License:Apache License

@VisibleForTesting
long getNextUpdateDelay(Credentials credentials) throws IOException {
    long now = System.currentTimeMillis();

    // This is almost the same logic as in SparkHadoopUtil.getTimeFromNowToRenewal
    for (Token<? extends TokenIdentifier> token : credentials.getAllTokens()) {
        if (DelegationTokenIdentifier.HDFS_DELEGATION_KIND.equals(token.getKind())) {
            DelegationTokenIdentifier identifier = new DelegationTokenIdentifier();
            try (DataInputStream input = new DataInputStream(new ByteArrayInputStream(token.getIdentifier()))) {
                identifier.readFields(input);

                // speed up by 2 seconds to account for any time race between driver and executor
                return Math.max(0L, (long) (identifier.getIssueDate() + 0.8 * updateIntervalMs) - now - 2000);
            }/*from   ww  w  .  ja  v a2 s  . c  om*/
        }
    }
    return 0L;
}

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