wangyang0918 commented on a change in pull request #9106: [FLINK-13184][yarn]
Support launching task executors with multi-thread on YARN.
URL: https://github.com/apache/flink/pull/9106#discussion_r308663264
##########
File path:
flink-yarn/src/main/java/org/apache/flink/yarn/YarnResourceManager.java
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@@ -186,6 +197,11 @@ public YarnResourceManager(
this.slotsPerWorker =
updateTaskManagerConfigAndCreateWorkerSlotProfiles(flinkConfig,
defaultTaskManagerMemoryMB, numberOfTaskSlots);
setFailUnfulfillableRequest(true);
+
+ this.startContainerExecutor = new ThreadPoolExecutor(0,
flinkConfig.getInteger(YarnConfigOptions.CONTAINER_LAUNCHER_NUM_MAX),
+ 60L, TimeUnit.SECONDS, new LinkedBlockingQueue<>(), new
ThreadFactoryBuilder()
+ .setNameFormat("ContainerLauncher #%d")
+ .build());
Review comment:
The default size of LinkedBlockingQueue is Integer.MAX_VALUE. Only when the
queue is full, the new threads will be started. Please refer to the java doc of
ThreadPoolExecutor. So i think we should use the FixedThreadPool instead.
Also, the executor service need to be shut down in postStop().
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