Github user chtyim commented on a diff in the pull request:
https://github.com/apache/incubator-twill/pull/52#discussion_r34399921
--- Diff:
twill-yarn/src/main/java/org/apache/twill/internal/appmaster/ApplicationMasterService.java
---
@@ -787,4 +804,80 @@ private Resource
createCapability(ResourceSpecification resourceSpec) {
capability.setMemory(resourceSpec.getMemorySize());
return capability;
}
+
+ /**
+ * Attempt to restart some instances from a runnable or some runnables.
+ * @return {@code true} if the message requests restarting some
instances and {@code false} otherwise.
+ */
+ private boolean handleRestartRunnablesInstances(final Message message,
final Runnable completion) {
+ LOG.debug("Check if it should process a restart runnable instances.");
+
+ if (message.getType() != Message.Type.SYSTEM) {
+ return false;
+ }
+
+ Message.Scope messageScope = message.getScope();
+ if (messageScope != Message.Scope.RUNNABLE && messageScope !=
Message.Scope.RUNNABLES) {
+ return false;
+ }
+
+ Command requestCommand = message.getCommand();
+ if
(!Constants.RESTART_ALL_RUNNABLE_INSTANCES.equals(requestCommand.getCommand())
&&
+
!Constants.RESTART_RUNNABLES_INSTANCES.equals(requestCommand.getCommand())) {
+ return false;
+ }
+
+ LOG.debug("Processing restart runnable instances message {}.",
message);
+
+ if (!Strings.isNullOrEmpty(message.getRunnableName()) &&
message.getScope() == Message.Scope.RUNNABLE) {
+ // ... for a runnable ...
+ String runnableName = message.getRunnableName();
+ LOG.debug("Start restarting all runnable {} instances.",
runnableName);
+ restartRunnableInstances(runnableName, null);
+ } else {
+ // ... or maybe some runnables
+ for (Map.Entry<String, String> option :
requestCommand.getOptions().entrySet()) {
+ String runnableName = option.getKey();
+ Set<Integer> restartedInstanceIds =
GSON.fromJson(option.getValue(),
+ new
TypeToken<Set<Integer>>() {}.getType());
+
+ LOG.debug("Start restarting runnable {} instances {}",
runnableName,
+ Arrays.toString(restartedInstanceIds.toArray()));
+ restartRunnableInstances(runnableName, new
LinkedList<>(restartedInstanceIds));
+ }
+ }
+
+ completion.run();
+ return true;
+ }
+
+ /**
+ * Helper method to restart instances of runnables.
+ */
+ private void restartRunnableInstances(String runnableName, @Nullable
Queue<Integer> instanceIds) {
+ LOG.debug("Begin restart runnable {} instances.", runnableName);
+
+ int oldCount = expectedContainers.getExpected(runnableName);
+ LOG.debug("Old instances for runnable {} is {}", runnableName,
oldCount);
+
+ if (instanceIds == null) {
+ LOG.debug("Instance ids is null so stopping all instances for
runnable {}", runnableName);
+
+ // restart all containers for a runnable
+ for (int i = (oldCount - 1); i >= 0; i--) {
+ LOG.debug("Remove last instance {} for runnable {}", i,
runnableName);
+ runningContainers.removeLast(runnableName);
+ }
+ } else {
+ LOG.debug("Stopping instances {} for runnable {}",
instanceIds.toArray(), runnableName);
+
+ for (int instanceId : instanceIds) {
+ LOG.debug("Remove instance {} for runnable {}", instanceId,
runnableName);
+ runningContainers.removeById(runnableName, instanceId);
--- End diff --
`removeById` will throw exception if the instanceId is not running. I think
it's better to just log if that happens, instead of breaking the restart loop.
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