/// <summary>
/// The specified queue is preemptable if system-wide preemption is turned on
/// unless any queue in the <em>qPath</em> hierarchy has explicitly turned
/// preemption off.
/// </summary>
/// <remarks>
/// The specified queue is preemptable if system-wide preemption is turned on
/// unless any queue in the <em>qPath</em> hierarchy has explicitly turned
/// preemption off.
/// NOTE: Preemptability is inherited from a queue's parent.
/// </remarks>
/// <returns>true if queue has preemption disabled, false otherwise</returns>
private bool IsQueueHierarchyPreemptionDisabled(CSQueue q)
{
CapacitySchedulerConfiguration csConf = csContext.GetConfiguration();
bool systemWidePreemption = csConf.GetBoolean(YarnConfiguration.RmSchedulerEnableMonitors
, YarnConfiguration.DefaultRmSchedulerEnableMonitors);
CSQueue parentQ = q.GetParent();
// If the system-wide preemption switch is turned off, all of the queues in
// the qPath hierarchy have preemption disabled, so return true.
if (!systemWidePreemption)
{
return(true);
}
// If q is the root queue and the system-wide preemption switch is turned
// on, then q does not have preemption disabled (default=false, below)
// unless the preemption_disabled property is explicitly set.
if (parentQ == null)
{
return(csConf.GetPreemptionDisabled(q.GetQueuePath(), false));
}
// If this is not the root queue, inherit the default value for the
// preemption_disabled property from the parent. Preemptability will be
// inherited from the parent's hierarchy unless explicitly overridden at
// this level.
return(csConf.GetPreemptionDisabled(q.GetQueuePath(), parentQ.GetPreemptionDisabled
()));
}