The attached Jenkinsfile can be used to reproduce this issue.

Running the Pipeline the first time, everything works as expected:

run a)
------

[Pipeline] {
[Pipeline] timestamps
[Pipeline] {

[Pipeline] stage
[Pipeline] { (one)

[Pipeline] script
[Pipeline]

{ [Pipeline] echo 00:00:06.159 simpletest-17 [Pipeline] }

[Pipeline] // script

[Pipeline] }
[Pipeline] // stage

[Pipeline] stage
[Pipeline] { (two)
[Pipeline] script
[Pipeline]

{ [Pipeline] echo 00:00:09.465 simpletest-17 [Pipeline] echo 00:00:10.274 simpletest-17 [Pipeline] }

[Pipeline] // script

[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // timestamps

[Pipeline] }
[Pipeline] // node

[Pipeline] End of Pipeline
Finished: SUCCESS

 

If it is restarted from stage 'two', the value of the global Map member is null. I would expect to have the value from the last run there:

 

run b) - restart from stage two
-------------------------------
[Pipeline] timestamps
[Pipeline] {
[Pipeline] stage
[Pipeline]

{ (one) Stage "one" skipped due to this build restarting at stage "two" [Pipeline] }

[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (two)
[Pipeline] script
[Pipeline]

{ [Pipeline] echo 00:00:07.975 simpletest-18 [Pipeline] echo 00:00:08.408 null --8<-- i would expect to get 'simpletest-17' instead of 'null' --8<-- [Pipeline] }

[Pipeline] // script
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // timestamps
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
Finished: SUCCESS