Example usage for org.apache.hadoop.hdfs.protocol BlockListAsLongs getBlockListAsLongs

Introduction

In this page you can find the example usage for org.apache.hadoop.hdfs.protocol BlockListAsLongs getBlockListAsLongs.

Prototype

abstract public long[] getBlockListAsLongs();

Source Link

Document

Convert block report to old-style list of longs.

Usage

From source file:common.DataNode.java

License:Apache License

/**
 * Report the list blocks to the Namenode
 * @throws IOException// www.j  a v a  2 s .  co  m
 */
private DatanodeCommand blockReport() throws IOException {
    // send block report
    DatanodeCommand cmd = null;
    long startTime = now();
    if (startTime - lastBlockReport > blockReportInterval) {
        //
        // Send latest block report if timer has expired.
        // Get back a list of local block(s) that are obsolete
        // and can be safely GC'ed.
        //
        long brStartTime = now();
        BlockListAsLongs bReport = data.getBlockReport();

        cmd = namenode.blockReport(dnRegistration, bReport.getBlockListAsLongs());
        long brTime = now() - brStartTime;
        myMetrics.blockReports.inc(brTime);
        LOG.info("BlockReport of " + bReport.getNumberOfBlocks() + " blocks got processed in " + brTime
                + " msecs");
        //
        // If we have sent the first block report, then wait a random
        // time before we start the periodic block reports.
        //
        if (resetBlockReportTime) {
            lastBlockReport = startTime - R.nextInt((int) (blockReportInterval));
            resetBlockReportTime = false;
        } else {
            /* say the last block report was at 8:20:14. The current report
             * should have started around 9:20:14 (default 1 hour interval).
             * If current time is :
             *   1) normal like 9:20:18, next report should be at 10:20:14
             *   2) unexpected like 11:35:43, next report should be at 12:20:14
             */
            lastBlockReport += (now() - lastBlockReport) / blockReportInterval * blockReportInterval;
        }
    }
    return cmd;
}

---