subprojects/parseq/src/main/java/com/linkedin/parseq/Engine.java
public boolean tryRun(final Task<?> task, final String planClass) {
    if (tryAcquirePermit(planClass)) {
      runWithPermit(task, planClass);
      return true;
    } else {
      return false;
    }
  }
public boolean tryRun(final Task<?> task, final String planClass) {
    if (tryAcquirePermit(planClass)) {
      runWithPermit(task, planClass);
      return true;
    } else {
      return false;
    }
  }
Runs the given task if Engine has a capacity to start new plan as specified by
{@value #MAX_CONCURRENT_PLANS} configuration parameter.
For the sake of backwards compatibility default value for a {@value #MAX_CONCURRENT_PLANS} is
{@value #DEFUALT_MAX_CONCURRENT_PLANS} which essentially means "unbounded capacity".
Task passed in as a parameter becomes a root on a new Plan.
All tasks created and started as a consequence of a root task will belong to that plan and will share a Trace.
This method returns immediately and does not block. It returns {@code true} if Plan was successfully started.
@param task the task to run
@param planClass string that identifies a "class" of the Plan
@return true if Plan was started