tillrohrmann commented on a change in pull request #10089: [FLINK-12342][yarn]
Remove container requests in order to reduce excess containers
URL: https://github.com/apache/flink/pull/10089#discussion_r343226103
##########
File path:
flink-yarn/src/main/java/org/apache/flink/yarn/YarnResourceManager.java
##########
@@ -370,45 +370,24 @@ public void onContainersCompleted(final
List<ContainerStatus> statuses) {
@Override
public void onContainersAllocated(List<Container> containers) {
runAsync(() -> {
+ log.info("Received {} containers with {} pending
container requests.", containers.size(), numPendingContainerRequests);
final Collection<AMRMClient.ContainerRequest>
pendingRequests = getPendingRequests();
final Iterator<AMRMClient.ContainerRequest>
pendingRequestsIterator = pendingRequests.iterator();
- for (Container container : containers) {
- log.info(
- "Received new container: {} - Remaining
pending container requests: {}",
- container.getId(),
- numPendingContainerRequests);
+ final int numAcceptedContainers =
Math.min(containers.size(), numPendingContainerRequests);
+ final List<Container> requiredContainers =
containers.subList(0, numAcceptedContainers);
+ final List<Container> excessContainers =
containers.subList(numAcceptedContainers, containers.size());
- if (numPendingContainerRequests > 0) {
-
removeContainerRequest(pendingRequestsIterator.next());
-
- final String containerIdStr =
container.getId().toString();
- final ResourceID resourceId = new
ResourceID(containerIdStr);
-
- workerNodeMap.put(resourceId, new
YarnWorkerNode(container));
-
- try {
- // Context information used to
start a TaskExecutor Java process
- ContainerLaunchContext
taskExecutorLaunchContext = createTaskExecutorLaunchContext(
- container.getResource(),
- containerIdStr,
-
container.getNodeId().getHost());
+ for (int i = 0; i < requiredContainers.size(); i++) {
+
removeContainerRequest(pendingRequestsIterator.next());
+ }
-
nodeManagerClient.startContainer(container, taskExecutorLaunchContext);
- } catch (Throwable t) {
- log.error("Could not start
TaskManager in container {}.", container.getId(), t);
+ for (Container excessContainer : excessContainers) {
+ returnExcessContainer(excessContainer);
+ }
- // release the failed container
-
workerNodeMap.remove(resourceId);
-
resourceManagerClient.releaseAssignedContainer(container.getId());
- // and ask for a new one
-
requestYarnContainerIfRequired();
- }
- } else {
- // return the excessive containers
- log.info("Returning excess container
{}.", container.getId());
-
resourceManagerClient.releaseAssignedContainer(container.getId());
- }
+ for (Container requiredContainer : requiredContainers) {
+ startTaskExecutorInContainer(requiredContainer);
Review comment:
I don't think that this happens too often. If this should become a problem,
then I would suggest to apply this optimization. At the moment it would only
complicate the implementation.
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