Example usage for org.apache.hadoop.hdfs.server.namenode FSNamesystem FSNamesystem

Introduction

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

Prototype

FSNamesystem(Configuration conf, FSImage fsImage) throws IOException 

Source Link

Usage

From source file:common.NameNode.java

License:Apache License

/**
 * Verify that configured directories exist, then
 * Interactively confirm that formatting is desired 
 * for each existing directory and format them.
 * //from  www  .ja  v  a2s .c om
 * @param conf
 * @param isConfirmationNeeded
 * @return true if formatting was aborted, false otherwise
 * @throws IOException
 */
private static boolean format(Configuration conf, boolean isConfirmationNeeded) throws IOException {
    Collection<URI> dirsToFormat = FSNamesystem.getNamespaceDirs(conf);
    Collection<URI> editDirsToFormat = FSNamesystem.getNamespaceEditsDirs(conf);
    for (Iterator<URI> it = dirsToFormat.iterator(); it.hasNext();) {
        File curDir = new File(it.next().getPath());
        if (!curDir.exists())
            continue;
        if (isConfirmationNeeded) {
            System.err.print("Re-format filesystem in " + curDir + " ? (Y or N) ");
            if (!(System.in.read() == 'Y')) {
                System.err.println("Format aborted in " + curDir);
                return true;
            }
            while (System.in.read() != '\n')
                ; // discard the enter-key
        }
    }

    FSNamesystem nsys = new FSNamesystem(new FSImage(dirsToFormat, editDirsToFormat), conf);
    nsys.dir.fsImage.format();
    return false;
}

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From source file:common.NameNode.java

License:Apache License

private static boolean finalize(Configuration conf, boolean isConfirmationNeeded) throws IOException {
    Collection<URI> dirsToFormat = FSNamesystem.getNamespaceDirs(conf);
    Collection<URI> editDirsToFormat = FSNamesystem.getNamespaceEditsDirs(conf);
    FSNamesystem nsys = new FSNamesystem(new FSImage(dirsToFormat, editDirsToFormat), conf);
    System.err.print("\"finalize\" will remove the previous state of the files system.\n"
            + "Recent upgrade will become permanent.\n" + "Rollback option will not be available anymore.\n");
    if (isConfirmationNeeded) {
        System.err.print("Finalize filesystem state ? (Y or N) ");
        if (!(System.in.read() == 'Y')) {
            System.err.println("Finalize aborted.");
            return true;
        }/*  w w  w .  j  a  v a 2s .c o m*/
        while (System.in.read() != '\n')
            ; // discard the enter-key
    }
    nsys.dir.fsImage.finalizeUpgrade();
    return false;
}

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