An example of restarting the subapp but not the master (idaholab#6297)

test/tests/restart/restart_subapp_not_master/complete_solve_no_subapp.i

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+[Mesh]
+  type = GeneratedMesh
+  dim = 2
+  xmin = -1
+  xmax =  1
+  ymin = -1
+  ymax =  1
+  nx = 2
+  ny = 2
+  elem_type = QUAD9
+[]
+
+[Functions]
+  [./exact_fn]
+    type = ParsedFunction
+    value = t*t*(x*x+y*y)
+  [../]
+
+  [./forcing_fn]
+    type = ParsedFunction
+    value = 2*t*(x*x+y*y)-4*t*t
+  [../]
+[]
+
+[Variables]
+  [./u]
+    family = LAGRANGE
+    order = SECOND
+  [../]
+[]
+
+[ICs]
+  [./u_var]
+    type = FunctionIC
+    variable = u
+    function = exact_fn
+  [../]
+[]
+
+[Kernels]
+  [./td]
+    type = TimeDerivative
+    variable = u
+  [../]
+
+  [./diff]
+    type = Diffusion
+    variable = u
+  [../]
+
+  [./ffn]
+    type = UserForcingFunction
+    variable = u
+    function = forcing_fn
+  [../]
+[]
+
+[BCs]
+  [./all]
+    type = FunctionDirichletBC
+    variable = u
+    boundary = 'left right top bottom'
+    function = exact_fn
+  [../]
+[]
+
+[Postprocessors]
+  [./average]
+    type = ElementAverageValue
+    variable = u
+  [../]
+[]
+
+[Executioner]
+  type = Transient
+  start_time = 0.0
+  end_time = 4.0
+  dt = 1.0
+[]
+
+[Outputs]
+  file_base = complete_solve_no_subapp
+  exodus = true
+[]

test/tests/restart/restart_subapp_not_master/tests

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+[Tests]
+  # only master, 0 <= t <= 4
+  [./complete_solve_no_subapp]
+    type = 'Exodiff'
+    input = 'complete_solve_no_subapp.i'
+    exodiff = 'complete_solve_no_subapp.e'
+  [../]
+  # split into sub solve 0 <= t <= 2 && master 2 <= t <= 4
+  # also write cp files for restart case
+  [./two_step_solve_master]
+    type = 'Exodiff'
+    input = 'two_step_solve_master.i'
+    exodiff = 'two_step_solve_master.e'
+    cli_args = 'Outputs/file_base=two_step_solve_master
+                MultiApps/full_solve/input_files=two_step_solve_sub.i'
+  [../]
+  # split into sub solve 0 <= t <= 2 && master 2 <= t <= 4
+  # this time restart the sub but _not_ the master
+  [./two_step_solve_master_restart]
+    type = 'Exodiff'
+    input = 'two_step_solve_master.i'
+    exodiff = 'two_step_solve_master_restart.e'
+    cli_args = 'Outputs/file_base=two_step_solve_master_restart
+                MultiApps/full_solve/input_files=two_step_solve_sub_restart.i'
+    prereq = two_step_solve_master
+    skip = 'Segfault #6297'
+  [../]
+[]

test/tests/restart/restart_subapp_not_master/two_step_solve_master.i

@@ -0,0 +1,105 @@
+[Mesh]
+  type = GeneratedMesh
+  dim = 2
+  xmin = -1
+  xmax =  1
+  ymin = -1
+  ymax =  1
+  nx = 2
+  ny = 2
+  elem_type = QUAD9
+[]
+
+[Functions]
+  [./exact_fn]
+    type = ParsedFunction
+    value = t*t*(x*x+y*y)
+  [../]
+
+  [./forcing_fn]
+    type = ParsedFunction
+    value = 2*t*(x*x+y*y)-4*t*t
+  [../]
+[]
+
+[Variables]
+  [./u]
+    family = LAGRANGE
+    order = SECOND
+  [../]
+[]
+
+[ICs]
+  active = ''
+  [./u_var]
+    type = FunctionIC
+    variable = u
+    function = exact_fn
+  [../]
+[]
+
+[Kernels]
+  [./td]
+    type = TimeDerivative
+    variable = u
+  [../]
+
+  [./diff]
+    type = Diffusion
+    variable = u
+  [../]
+
+  [./ffn]
+    type = UserForcingFunction
+    variable = u
+    function = forcing_fn
+  [../]
+[]
+
+[BCs]
+  [./all]
+    type = FunctionDirichletBC
+    variable = u
+    boundary = 'left right top bottom'
+    function = exact_fn
+  [../]
+[]
+
+[Postprocessors]
+  [./average]
+    type = ElementAverageValue
+    variable = u
+    execute_on = 'initial timestep_end'
+  [../]
+[]
+
+[Executioner]
+  type = Transient
+  start_time = 2.0
+  end_time = 4.0
+  dt = 1.0
+[]
+
+[MultiApps]
+  [./full_solve]
+    type = FullSolveMultiApp
+    execute_on = initial
+    positions = '0 0 0'
+    ##input_files = two_step_solve_sub.i
+  [../]
+[]
+
+[Transfers]
+  [./transfer_u]
+    type = MultiAppProjectionTransfer
+    multi_app = full_solve
+    direction = FROM_MULTIAPP
+    variable = u
+    source_variable = u
+  [../]
+[]
+
+[Outputs]
+  ##file_base = two_step_solve_master
+  exodus = true
+[]

test/tests/restart/restart_subapp_not_master/two_step_solve_sub.i

@@ -0,0 +1,86 @@
+[Mesh]
+  type = GeneratedMesh
+  dim = 2
+  xmin = -1
+  xmax =  1
+  ymin = -1
+  ymax =  1
+  nx = 2
+  ny = 2
+  elem_type = QUAD9
+[]
+
+[Functions]
+  [./exact_fn]
+    type = ParsedFunction
+    value = t*t*(x*x+y*y)
+  [../]
+
+  [./forcing_fn]
+    type = ParsedFunction
+    value = 2*t*(x*x+y*y)-4*t*t
+  [../]
+[]
+
+[Variables]
+  [./u]
+    family = LAGRANGE
+    order = SECOND
+  [../]
+[]
+
+[ICs]
+  [./u_var]
+    type = FunctionIC
+    variable = u
+    function = exact_fn
+  [../]
+[]
+
+[Kernels]
+  [./td]
+    type = TimeDerivative
+    variable = u
+  [../]
+
+  [./diff]
+    type = Diffusion
+    variable = u
+  [../]
+
+  [./ffn]
+    type = UserForcingFunction
+    variable = u
+    function = forcing_fn
+  [../]
+[]
+
+[BCs]
+  [./all]
+    type = FunctionDirichletBC
+    variable = u
+    boundary = 'left right top bottom'
+    function = exact_fn
+  [../]
+[]
+
+[Postprocessors]
+  [./average]
+    type = ElementAverageValue
+    variable = u
+  [../]
+[]
+
+[Executioner]
+  type = Transient
+  start_time = 0.0
+  end_time = 2.0
+  dt = 1.0
+[]
+
+[Outputs]
+  [./checkpoint]
+    type = Checkpoint
+    num_files = 3
+  [../]
+[]

test/tests/restart/restart_subapp_not_master/two_step_solve_sub_restart.i

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+[Mesh]
+  file = two_step_solve_master_out_full_solve0_cp/0002_mesh.cpr
+[]
+
+[Problem]
+  restart_file_base = two_step_solve_master_out_full_solve0_cp/0002
+[]
+
+[Functions]
+  [./exact_fn]
+    type = ParsedFunction
+    value = t*t*(x*x+y*y)
+  [../]
+
+  [./forcing_fn]
+    type = ParsedFunction
+    value = 2*t*(x*x+y*y)-4*t*t
+  [../]
+[]
+
+[Variables]
+  [./u]
+    family = LAGRANGE
+    order = SECOND
+  [../]
+[]
+
+[ICs]
+  [./u_var]
+    type = FunctionIC
+    variable = u
+    function = exact_fn
+  [../]
+[]
+
+[Kernels]
+  [./td]
+    type = TimeDerivative
+    variable = u
+  [../]
+
+  [./diff]
+    type = Diffusion
+    variable = u
+  [../]
+
+  [./ffn]
+    type = UserForcingFunction
+    variable = u
+    function = forcing_fn
+  [../]
+[]
+
+[BCs]
+  [./all]
+    type = FunctionDirichletBC
+    variable = u
+    boundary = 'left right top bottom'
+    function = exact_fn
+  [../]
+[]
+
+[Postprocessors]
+  [./average]
+    type = ElementAverageValue
+    variable = u
+  [../]
+[]
+
+[Executioner]
+  type = Transient
+  start_time = 0.0
+  end_time = 2.0
+  dt = 1.0
+[]
+
+[Outputs]
+  [./checkpoint]
+    type = Checkpoint
+    num_files = 3
+  [../]
+[]