Example usage for org.apache.hadoop.fs FileSystem enableSymlinks

Introduction

In this page you can find the example usage for org.apache.hadoop.fs FileSystem enableSymlinks.

Prototype

@VisibleForTesting
    public static void enableSymlinks() 

Source Link

Usage

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

License:Apache License

private void initMiniDFSCluster(Configuration conf, int numDataNodes, StorageType storageType, boolean format,
        boolean manageNameDfsDirs, boolean manageNameDfsSharedDirs, boolean enableManagedDfsDirsRedundancy,
        boolean manageDataDfsDirs, StartupOption startOpt, StartupOption dnStartOpt, String[] racks,
        String[] hosts, long[] simulatedCapacities, String clusterId, boolean waitSafeMode,
        boolean setupHostsFile, MiniDFSNNTopology nnTopology, boolean checkExitOnShutdown,
        boolean checkDataNodeAddrConfig, boolean checkDataNodeHostConfig, Configuration[] dnConfOverlays)
        throws IOException {
    ExitUtil.disableSystemExit();/*from w w  w  .  j a  v  a2s. c  om*/

    // Re-enable symlinks for tests, see HADOOP-10020 and HADOOP-10052
    FileSystem.enableSymlinks();

    synchronized (MiniDFSCluster.class) {
        instanceId = instanceCount++;
    }

    this.conf = conf;
    base_dir = new File(determineDfsBaseDir());
    data_dir = new File(base_dir, "data");
    this.waitSafeMode = waitSafeMode;
    this.checkExitOnShutdown = checkExitOnShutdown;

    int replication = conf.getInt(DFS_REPLICATION_KEY, 3);
    conf.setInt(DFS_REPLICATION_KEY, Math.min(replication, numDataNodes));
    int safemodeExtension = conf.getInt(DFS_NAMENODE_SAFEMODE_EXTENSION_TESTING_KEY, 0);
    conf.setInt(DFS_NAMENODE_SAFEMODE_EXTENSION_KEY, safemodeExtension);
    conf.setInt(DFS_NAMENODE_DECOMMISSION_INTERVAL_KEY, 3); // 3 second
    conf.setClass(NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY, StaticMapping.class, DNSToSwitchMapping.class);

    // In an HA cluster, in order for the StandbyNode to perform checkpoints,
    // it needs to know the HTTP port of the Active. So, if ephemeral ports
    // are chosen, disable checkpoints for the test.
    if (!nnTopology.allHttpPortsSpecified() && nnTopology.isHA()) {
        LOG.info("MiniDFSCluster disabling checkpointing in the Standby node "
                + "since no HTTP ports have been specified.");
        conf.setBoolean(DFS_HA_STANDBY_CHECKPOINTS_KEY, false);
    }
    if (!nnTopology.allIpcPortsSpecified() && nnTopology.isHA()) {
        LOG.info("MiniDFSCluster disabling log-roll triggering in the "
                + "Standby node since no IPC ports have been specified.");
        conf.setInt(DFS_HA_LOGROLL_PERIOD_KEY, -1);
    }

    federation = nnTopology.isFederated();
    try {
        createNameNodesAndSetConf(nnTopology, manageNameDfsDirs, manageNameDfsSharedDirs,
                enableManagedDfsDirsRedundancy, format, startOpt, clusterId, conf);
    } catch (IOException ioe) {
        LOG.error("IOE creating namenodes. Permissions dump:\n" + createPermissionsDiagnosisString(data_dir));
        throw ioe;
    }
    if (format) {
        if (data_dir.exists() && !FileUtil.fullyDelete(data_dir)) {
            throw new IOException(
                    "Cannot remove data directory: " + data_dir + createPermissionsDiagnosisString(data_dir));
        }
    }

    if (startOpt == StartupOption.RECOVER) {
        return;
    }

    // Start the DataNodes
    startDataNodes(conf, numDataNodes, storageType, manageDataDfsDirs,
            dnStartOpt != null ? dnStartOpt : startOpt, racks, hosts, simulatedCapacities, setupHostsFile,
            checkDataNodeAddrConfig, checkDataNodeHostConfig, dnConfOverlays);
    waitClusterUp();
    // make sure ProxyUsers uses the latest conf
    ProxyUsers.refreshSuperUserGroupsConfiguration(conf);
}

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