/**
* Whether this app has containers requests that could be satisfied on the given node, if the node
* had full space.
*/
public boolean hasContainerForNode(Priority prio, FSSchedulerNode node) {
ResourceRequest anyRequest = app.getResourceRequest(prio, ResourceRequest.ANY);
ResourceRequest rackRequest = app.getResourceRequest(prio, node.getRackName());
ResourceRequest nodeRequest = app.getResourceRequest(prio, node.getNodeName());
return
// There must be outstanding requests at the given priority:
anyRequest != null
&& anyRequest.getNumContainers() > 0
&&
// If locality relaxation is turned off at *-level, there must be a
// non-zero request for the node's rack:
(anyRequest.getRelaxLocality()
|| (rackRequest != null && rackRequest.getNumContainers() > 0))
&&
// If locality relaxation is turned off at rack-level, there must be a
// non-zero request at the node:
(rackRequest == null
|| rackRequest.getRelaxLocality()
|| (nodeRequest != null && nodeRequest.getNumContainers() > 0))
&&
// The requested container must be able to fit on the node:
Resources.lessThanOrEqual(
RESOURCE_CALCULATOR,
null,
anyRequest.getCapability(),
node.getRMNode().getTotalCapability());
}
private Resource assignContainer(
FSSchedulerNode node, boolean reserved, TransactionState transactionState) {
if (LOG.isDebugEnabled()) {
LOG.debug("Node offered to app: " + getName() + " reserved: " + reserved);
}
if (reserved) {
RMContainer rmContainer = node.getReservedContainer();
Priority priority = rmContainer.getReservedPriority();
// Make sure the application still needs requests at this priority
if (app.getTotalRequiredResources(priority) == 0) {
unreserve(priority, node);
return Resources.none();
}
}
Collection<Priority> prioritiesToTry =
(reserved)
? Arrays.asList(node.getReservedContainer().getReservedPriority())
: app.getPriorities();
// For each priority, see if we can schedule a node local, rack local
// or off-switch request. Rack of off-switch requests may be delayed
// (not scheduled) in order to promote better locality.
synchronized (app) {
for (Priority priority : prioritiesToTry) {
if (app.getTotalRequiredResources(priority) <= 0 || !hasContainerForNode(priority, node)) {
continue;
}
app.addSchedulingOpportunity(priority);
ResourceRequest rackLocalRequest = app.getResourceRequest(priority, node.getRackName());
ResourceRequest localRequest = app.getResourceRequest(priority, node.getNodeName());
if (localRequest != null && !localRequest.getRelaxLocality()) {
LOG.warn("Relax locality off is not supported on local request: " + localRequest);
}
NodeType allowedLocality;
if (scheduler.isContinuousSchedulingEnabled()) {
allowedLocality =
app.getAllowedLocalityLevelByTime(
priority,
scheduler.getNodeLocalityDelayMs(),
scheduler.getRackLocalityDelayMs(),
scheduler.getClock().getTime());
} else {
allowedLocality =
app.getAllowedLocalityLevel(
priority,
scheduler.getNumClusterNodes(),
scheduler.getNodeLocalityThreshold(),
scheduler.getRackLocalityThreshold());
}
if (rackLocalRequest != null
&& rackLocalRequest.getNumContainers() != 0
&& localRequest != null
&& localRequest.getNumContainers() != 0) {
return assignContainer(
node, priority, localRequest, NodeType.NODE_LOCAL, reserved, transactionState);
}
if (rackLocalRequest != null && !rackLocalRequest.getRelaxLocality()) {
continue;
}
if (rackLocalRequest != null
&& rackLocalRequest.getNumContainers() != 0
&& (allowedLocality.equals(NodeType.RACK_LOCAL)
|| allowedLocality.equals(NodeType.OFF_SWITCH))) {
return assignContainer(
node, priority, rackLocalRequest, NodeType.RACK_LOCAL, reserved, transactionState);
}
ResourceRequest offSwitchRequest = app.getResourceRequest(priority, ResourceRequest.ANY);
if (offSwitchRequest != null && !offSwitchRequest.getRelaxLocality()) {
continue;
}
if (offSwitchRequest != null
&& offSwitchRequest.getNumContainers() != 0
&& allowedLocality.equals(NodeType.OFF_SWITCH)) {
return assignContainer(
node, priority, offSwitchRequest, NodeType.OFF_SWITCH, reserved, transactionState);
}
}
}
return Resources.none();
}
