Example usage for org.apache.hadoop.hdfs.server.namenode NameNode isInSafeMode

Introduction

In this page you can find the example usage for org.apache.hadoop.hdfs.server.namenode NameNode isInSafeMode.

Prototype

public boolean isInSafeMode() 

Source Link

Document

Is the cluster currently in safe mode?

Usage

From source file:backup.integration.MiniClusterTestBase.java

License:Apache License

@Test
public void testIntegrationBasicFullRestoreFromShutdown() throws Exception {
    File hdfsDir = setupHdfsLocalDir();
    Configuration conf = setupConfig(hdfsDir);
    {/*from  w w w . j a v  a  2s  .  c om*/
        MiniDFSCluster hdfsCluster = new MiniDFSCluster.Builder(conf).build();
        try {
            DistributedFileSystem fileSystem = hdfsCluster.getFileSystem();
            for (int i = 0; i < 5; i++) {
                Path path = new Path("/testing." + i + ".txt");
                System.out.println("Adding path " + path);
                writeFile(fileSystem, path);
            }

            Thread.sleep(TimeUnit.SECONDS.toMillis(3));

            hdfsCluster.stopDataNode(0);

            // Remove data
            FileUtils.deleteDirectory(new File(hdfsDir, "data"));

            hdfsCluster.startDataNodes(conf, 1, true, null, null);

            NameNode nameNode = hdfsCluster.getNameNode();
            for (int i = 0; i < 90; i++) {
                if (!nameNode.isInSafeMode()) {
                    return;
                }
                System.out.println(nameNode.getState() + " " + nameNode.isInSafeMode());
                Thread.sleep(1000);
            }
            fail();
        } finally {
            hdfsCluster.shutdown();
            destroyBackupStore(conf);
        }
    }
}

---

From source file:com.mellanox.r4h.MiniDFSCluster.java

License:Apache License

/**
 * Returns true if the NameNode is running and is out of Safe Mode
 * or if waiting for safe mode is disabled.
 *///w w  w  .  ja  va2  s . c  o m
public boolean isNameNodeUp(int nnIndex) {
    NameNode nameNode = nameNodes[nnIndex].nameNode;
    if (nameNode == null) {
        return false;
    }
    long[] sizes;
    sizes = NameNodeAdapter.getStats(nameNode.getNamesystem());
    boolean isUp = false;
    synchronized (this) {
        isUp = ((!nameNode.isInSafeMode() || !waitSafeMode)
                && sizes[ClientProtocol.GET_STATS_CAPACITY_IDX] != 0);
    }
    return isUp;
}

---