Examples of org.apache.hadoop.hdfs.server.common.Storage

Package org.apache.hadoop.hdfs.server.common

Examples of org.apache.hadoop.hdfs.server.common.Storage

org.apache.hadoop.hdfs.server.common.Storage
Storage information file.
Local storage information is stored in a separate file VERSION. It contains type of the node, the storage layout version, the namespace id, and the fs state creation time.
Local storage can reside in multiple directories. Each directory should contain the same VERSION file as the others. During startup Hadoop servers (name-node and data-nodes) read their local storage information from them.
The servers hold a lock for each storage directory while they run so that other nodes were not able to startup sharing the same storage. The locks are released when the servers stop (normally or abnormally).

   *
   * @return the created version file
   */
  public static File[] createNameNodeVersionFile(Configuration conf,
      File[] parent, StorageInfo version, String bpid) throws IOException {
    Storage storage = new NNStorage(conf, 
                              Collections.<URI>emptyList(), 
                              Collections.<URI>emptyList());
    storage.setStorageInfo(version);
    File[] versionFiles = new File[parent.length];
    for (int i = 0; i < parent.length; i++) {
      versionFiles[i] = new File(parent[i], "VERSION");
      StorageDirectory sd = new StorageDirectory(parent[i].getParentFile());
      storage.writeProperties(versionFiles[i], sd);
    }
    return versionFiles;
  }

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   */
  public static File[] createVersionFile(NodeType nodeType, File[] parent,
      StorageInfo version, int namespaceId, boolean nsLayout)
      throws IOException
  {
    Storage storage = null;
    File[] versionFiles = new File[parent.length];
    for (int i = 0; i < parent.length; i++) {
      File versionFile = new File(parent[i], "VERSION");
      FileUtil.fullyDelete(versionFile);
      switch (nodeType) {

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