void initializeDistributedUpgrade() throws IOException {
    if(! upgradeManager.initializeUpgrade())
      return;
    // write new upgrade state into disk
    writeAll();
    LOG.info("\n   Distributed upgrade for NameNode version "
             + upgradeManager.getUpgradeVersion() + " to current LV "
             + layoutVersion + " is initialized.");
  }
void initializeDistributedUpgrade ( ) throws IOException { if ( ! upgradeManager . initializeUpgrade ( ) ) return ; writeAll ( ) ; LOG . info ( "\n   Distributed upgrade for NameNode version " + upgradeManager . getUpgradeVersion ( ) + " to current LV " + layoutVersion + " is initialized." ) ; }
Initialize a distributed upgrade.