Example usage for org.apache.hadoop.hdfs DFSConfigKeys DFS_HEARTBEAT_INTERVAL_DEFAULT

Introduction

In this page you can find the example usage for org.apache.hadoop.hdfs DFSConfigKeys DFS_HEARTBEAT_INTERVAL_DEFAULT.

Prototype

long DFS_HEARTBEAT_INTERVAL_DEFAULT

To view the source code for org.apache.hadoop.hdfs DFSConfigKeys DFS_HEARTBEAT_INTERVAL_DEFAULT.

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Usage

From source file:mzb.Balancer.java

License:Apache License

/**
 * Balance all namenodes./* w w w .  ja v a2 s.  co m*/
 * For each iteration,
 * for each namenode,
 * execute a {@link Balancer} to work through all datanodes once.  
 */
static int run(Collection<URI> namenodes, Configuration conf) throws IOException, InterruptedException {
    final long sleeptime = 2000 * conf.getLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY,
            DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_DEFAULT);
    LOG.info("namenodes = " + namenodes);
    //    LOG.info("p         = " + p);

    final Formatter formatter = new Formatter(System.out);
    System.out.println(
            "Time Stamp               Iteration#  Bytes Already Moved  Bytes Left To Move  Bytes Being Moved");

    final List<NameNodeConnector> connectors = new ArrayList<NameNodeConnector>(namenodes.size());
    try {
        for (URI uri : namenodes) {
            connectors.add(new NameNodeConnector(uri, conf));
        }

        boolean done = false;
        for (int iteration = 0; !done; iteration++) {
            done = true;
            Collections.shuffle(connectors);
            for (NameNodeConnector nnc : connectors) {
                final Balancer b = new Balancer(nnc, conf);
                final ReturnStatus r = b.run(iteration, formatter, conf);
                // clean all lists
                b.resetData(conf);
                if (r == ReturnStatus.IN_PROGRESS) {
                    done = false;
                } else if (r != ReturnStatus.SUCCESS) {
                    //must be an error statue, return.
                    return r.code;
                }
            }

            if (!done) {
                Thread.sleep(sleeptime);
            }
        }
    } finally {
        for (NameNodeConnector nnc : connectors) {
            nnc.close();
        }
    }
    return ReturnStatus.SUCCESS.code;
}

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