Options for Tracking Object Migration

• Option 1: do nothing at migration time
  • object fault occurs at next invocation through each reference
  • object must be located through the use of search
• Option 2: replace migrated object with forward reference
  • invocations are redirected transparently to the new location
  • references are updated through piggy-backed information
• Option 3: callback to all references at migration time
  • no further work necessary at invocation time
• Option 4: update name-server(s) at migration time
  • object fault occurs at next invocation through each reference
  • name-server query to determine new location of object
  • reference invokes object at new location