/**
* Assign a container to this node to facilitate {@code request}. If node does not have enough
* memory, create a reservation. This is called once we are sure the particular request should be
* facilitated by this node.
*
* @param node The node to try placing the container on.
* @param request The ResourceRequest we're trying to satisfy.
* @param type The locality of the assignment.
* @param reserved Whether there's already a container reserved for this app on the node.
* @return If an assignment was made, returns the resources allocated to the container. If a
* reservation was made, returns FairScheduler.CONTAINER_RESERVED. If no assignment or
* reservation was made, returns an empty resource.
*/
private Resource assignContainer(
FSSchedulerNode node, ResourceRequest request, NodeType type, boolean reserved) {
// How much does this request need?
Resource capability = request.getCapability();
// How much does the node have?
Resource available = node.getAvailableResource();
Container container = null;
if (reserved) {
container = node.getReservedContainer().getContainer();
} else {
container = createContainer(node, capability, request.getPriority());
}
// Can we allocate a container on this node?
if (Resources.fitsIn(capability, available)) {
// Inform the application of the new container for this request
RMContainer allocatedContainer =
allocate(type, node, request.getPriority(), request, container);
if (allocatedContainer == null) {
// Did the application need this resource?
if (reserved) {
unreserve(request.getPriority(), node);
}
return Resources.none();
}
// If we had previously made a reservation, delete it
if (reserved) {
unreserve(request.getPriority(), node);
}
// Inform the node
node.allocateContainer(allocatedContainer);
// If this container is used to run AM, update the leaf queue's AM usage
if (getLiveContainers().size() == 1 && !getUnmanagedAM()) {
getQueue().addAMResourceUsage(container.getResource());
setAmRunning(true);
}
return container.getResource();
} else {
// The desired container won't fit here, so reserve
reserve(request.getPriority(), node, container, reserved);
return FairScheduler.CONTAINER_RESERVED;
}
}
public static ResourceRequest newResourceRequest(ResourceRequest r) {
ResourceRequest request = recordFactory.newRecordInstance(ResourceRequest.class);
request.setPriority(r.getPriority());
request.setResourceName(r.getResourceName());
request.setCapability(r.getCapability());
request.setNumContainers(r.getNumContainers());
return request;
}
/**
* Changed the return type to AllocateResponse which use to hold a reference to AMResponse.
*
* <p>AMResponse seems to have disappeared in CDH 4.6
*
* @param requestedContainers
* @param releasedContainers
* @return
* @throws YarnRemoteException
*/
public AllocateResponse allocateRequest(
List<ResourceRequest> requestedContainers, List<ContainerId> releasedContainers)
throws YarnRemoteException {
if (amResourceManager == null)
throw new IllegalStateException(
"Cannot send allocation request before connecting to the resource manager!");
LOG.info(
"Sending allocation request"
+ ", requestedSize="
+ requestedContainers.size()
+ ", releasedSize="
+ releasedContainers.size());
for (ResourceRequest req : requestedContainers)
LOG.info(
"Requesting container, host="
+ req.getHostName()
+ ", amount="
+ req.getNumContainers()
+ ", memory="
+ req.getCapability().getMemory()
+ ", priority="
+ req.getPriority().getPriority());
for (ContainerId rel : releasedContainers) LOG.info("Releasing container: " + rel.getId());
AllocateRequest request = Records.newRecord(AllocateRequest.class);
request.setResponseId(rmRequestId.incrementAndGet());
request.setApplicationAttemptId(appAttemptId);
request.addAllAsks(requestedContainers);
request.addAllReleases(releasedContainers);
AllocateResponse response = amResourceManager.allocate(request);
// response.getAllocatedContainers()
LOG.debug(
"Got an allocation response, "
+ ", responseId="
+ response.getResponseId()
+ ", numClusterNodes="
+ response.getNumClusterNodes()
+ ", headroom="
+ response.getAvailableResources().getMemory()
+ ", allocatedSize="
+ response.getAllocatedContainers().size()
+ ", updatedNodes="
+ response.getUpdatedNodes().size()
+ ", reboot="
+ response.getReboot()
+ ", completedSize="
+ response.getCompletedContainersStatuses().size());
return response;
}
@Override
public AllocateResponse allocate(float progressIndicator) throws YarnException, IOException {
Preconditions.checkArgument(
progressIndicator >= 0, "Progress indicator should not be negative");
AllocateResponse allocateResponse = null;
List<ResourceRequest> askList = null;
List<ContainerId> releaseList = null;
AllocateRequest allocateRequest = null;
List<String> blacklistToAdd = new ArrayList<String>();
List<String> blacklistToRemove = new ArrayList<String>();
try {
synchronized (this) {
askList = new ArrayList<ResourceRequest>(ask.size());
for (ResourceRequest r : ask) {
// create a copy of ResourceRequest as we might change it while the
// RPC layer is using it to send info across
askList.add(
ResourceRequest.newInstance(
r.getPriority(),
r.getResourceName(),
r.getCapability(),
r.getNumContainers(),
r.getRelaxLocality(),
r.getNodeLabelExpression()));
}
releaseList = new ArrayList<ContainerId>(release);
// optimistically clear this collection assuming no RPC failure
ask.clear();
release.clear();
blacklistToAdd.addAll(blacklistAdditions);
blacklistToRemove.addAll(blacklistRemovals);
ResourceBlacklistRequest blacklistRequest =
(blacklistToAdd != null) || (blacklistToRemove != null)
? ResourceBlacklistRequest.newInstance(blacklistToAdd, blacklistToRemove)
: null;
allocateRequest =
AllocateRequest.newInstance(
lastResponseId, progressIndicator, askList, releaseList, blacklistRequest);
// clear blacklistAdditions and blacklistRemovals before
// unsynchronized part
blacklistAdditions.clear();
blacklistRemovals.clear();
}
try {
allocateResponse = rmClient.allocate(allocateRequest);
} catch (ApplicationMasterNotRegisteredException e) {
LOG.warn("ApplicationMaster is out of sync with ResourceManager," + " hence resyncing.");
synchronized (this) {
release.addAll(this.pendingRelease);
blacklistAdditions.addAll(this.blacklistedNodes);
for (Map<String, TreeMap<Resource, ResourceRequestInfo>> rr :
remoteRequestsTable.values()) {
for (Map<Resource, ResourceRequestInfo> capabalities : rr.values()) {
for (ResourceRequestInfo request : capabalities.values()) {
addResourceRequestToAsk(request.remoteRequest);
}
}
}
}
// re register with RM
registerApplicationMaster();
allocateResponse = allocate(progressIndicator);
return allocateResponse;
}
synchronized (this) {
// update these on successful RPC
clusterNodeCount = allocateResponse.getNumClusterNodes();
lastResponseId = allocateResponse.getResponseId();
clusterAvailableResources = allocateResponse.getAvailableResources();
if (!allocateResponse.getNMTokens().isEmpty()) {
populateNMTokens(allocateResponse.getNMTokens());
}
if (allocateResponse.getAMRMToken() != null) {
updateAMRMToken(allocateResponse.getAMRMToken());
}
if (!pendingRelease.isEmpty()
&& !allocateResponse.getCompletedContainersStatuses().isEmpty()) {
removePendingReleaseRequests(allocateResponse.getCompletedContainersStatuses());
}
}
} finally {
// TODO how to differentiate remote yarn exception vs error in rpc
if (allocateResponse == null) {
// we hit an exception in allocate()
// preserve ask and release for next call to allocate()
synchronized (this) {
release.addAll(releaseList);
// requests could have been added or deleted during call to allocate
// If requests were added/removed then there is nothing to do since
// the ResourceRequest object in ask would have the actual new value.
// If ask does not have this ResourceRequest then it was unchanged and
// so we can add the value back safely.
// This assumes that there will no concurrent calls to allocate() and
// so we dont have to worry about ask being changed in the
// synchronized block at the beginning of this method.
for (ResourceRequest oldAsk : askList) {
if (!ask.contains(oldAsk)) {
ask.add(oldAsk);
}
}
blacklistAdditions.addAll(blacklistToAdd);
blacklistRemovals.addAll(blacklistToRemove);
}
}
}
return allocateResponse;
}
protected void containerFailedOnHost(String hostName) {
if (!nodeBlacklistingEnabled) {
return;
}
if (blacklistedNodes.contains(hostName)) {
if (LOG.isDebugEnabled()) {
LOG.debug("Host " + hostName + " is already blacklisted.");
}
return; // already blacklisted
}
Integer failures = nodeFailures.remove(hostName);
failures = failures == null ? Integer.valueOf(0) : failures;
failures++;
LOG.info(failures + " failures on node " + hostName);
if (failures >= maxTaskFailuresPerNode) {
blacklistedNodes.add(hostName);
// Even if blacklisting is ignored, continue to remove the host from
// the request table. The RM may have additional nodes it can allocate on.
LOG.info("Blacklisted host " + hostName);
// remove all the requests corresponding to this hostname
for (Map<String, Map<Resource, ResourceRequest>> remoteRequests :
remoteRequestsTable.values()) {
// remove from host if no pending allocations
boolean foundAll = true;
Map<Resource, ResourceRequest> reqMap = remoteRequests.get(hostName);
if (reqMap != null) {
for (ResourceRequest req : reqMap.values()) {
if (!ask.remove(req)) {
foundAll = false;
// if ask already sent to RM, we can try and overwrite it if possible.
// send a new ask to RM with numContainers
// specified for the blacklisted host to be 0.
ResourceRequest zeroedRequest =
ResourceRequest.newInstance(
req.getPriority(),
req.getResourceName(),
req.getCapability(),
req.getNumContainers(),
req.getRelaxLocality());
zeroedRequest.setNumContainers(0);
// to be sent to RM on next heartbeat
addResourceRequestToAsk(zeroedRequest);
}
}
// if all requests were still in ask queue
// we can remove this request
if (foundAll) {
remoteRequests.remove(hostName);
}
}
// TODO handling of rack blacklisting
// Removing from rack should be dependent on no. of failures within the rack
// Blacklisting a rack on the basis of a single node's blacklisting
// may be overly aggressive.
// Node failures could be co-related with other failures on the same rack
// but we probably need a better approach at trying to decide how and when
// to blacklist a rack
}
} else {
nodeFailures.put(hostName, failures);
}
}