I have a workflow that should only need one workspace but consumes 2 
workspaces (1 for those steps that run on the dockerHostNode agent and 1 
for those steps that run on a 'dockerHost' docker container agent).  At one 
time the build only consumed one workspace but at some point (after 
triggering 2 jobs simultaneously, I think) the build started using multiple 
workspaces per a single job execution.  

Jenkins version 1.609.3
workflow version is 1.12

Here is a simplified example of how my workflow looks:

stage name: 'sync workspace', concurrency: 2
   node(dockerHostNode) {
      checkout ...
   }
stage name: 'Build Source', concurrency: 2
   node(dockerHostNode) {
      sh  make ...
   }

stage name: 'Run unittest', concurrency: 2

   parallel( 
       unittest-a : { 
           node('dockerNode'){
               sh ...  // run unittest-a
           }
       },
       unittest-b : { 
           node('dockerNode'){
               sh ...  // run unittest-b
           }
       }
   )

stage name: 'Post Build Task', concurrency: 2
   node(hostNode) {
      sh  make ...  // collect artifacts, scan logs, etc
   }

Does anyone have any idea why my workflow is creating multiple workspaces 
during a single workflow job execution?  For now I am using ws() to force 
all job steps to use the same workspace, but I can still see that a second 
workspace is unnecessarily created during some of the allocate node start 
steps.

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