Field Detail

• LOG

  private static final org.apache.commons.logging.Log LOG

• CLIENT_FINALIZER_DATA_METHOD

  private static final String CLIENT_FINALIZER_DATA_METHOD

  See Also:

  Constant Field Values

• RUN_SHUTDOWN_HOOK

  public static final String RUN_SHUTDOWN_HOOK

  Key for boolean configuration whose default is true.

  See Also:

  Constant Field Values

• FS_SHUTDOWN_HOOK_WAIT

  public static final String FS_SHUTDOWN_HOOK_WAIT

  Key for a long configuration on how much time to wait on the fs shutdown hook. Default is 30 seconds.

  See Also:

  Constant Field Values

• fsShutdownHooks

  private static final Map<Runnable,Integer> fsShutdownHooks

  A place for keeping track of all the filesystem shutdown hooks that need to be executed after the last regionserver referring to a given filesystem stops. We keep track of the # of regionserver references in values of the map.

Constructor Detail

• ShutdownHook

  public ShutdownHook()

Method Detail

• install

  public static void install(org.apache.hadoop.conf.Configuration conf,
             org.apache.hadoop.fs.FileSystem fs,
             Stoppable stop,
             Thread threadToJoin)

  Install a shutdown hook that calls stop on the passed Stoppable and then thread joins against the passed threadToJoin. When this thread completes, it then runs the hdfs thread (This install removes the hdfs shutdown hook keeping a handle on it to run it after threadToJoin has stopped).

  To suppress all shutdown hook handling -- both the running of the regionserver hook and of the hdfs hook code -- set RUN_SHUTDOWN_HOOK in Configuration to false. This configuration value is checked when the hook code runs.

  Parameters:

  conf -

  fs - Instance of Filesystem used by the RegionServer

  stop - Installed shutdown hook will call stop against this passed Stoppable instance.

  threadToJoin - After calling stop on stop will then join this thread.

• suppressHdfsShutdownHook

  private static Runnable suppressHdfsShutdownHook(org.apache.hadoop.fs.FileSystem fs)

• main

  public static void main(String[] args)
                   throws IOException

  Main to test basic functionality. Run with clean hadoop 0.20 and hadoop 0.21 and cloudera patched hadoop to make sure our shutdown hook handling works for all compbinations. Pass '-Dhbase.shutdown.hook=false' to test turning off the running of shutdown hooks.

  Parameters:

  args -

  Throws:

  IOException