YARN-8382. cgroup file leak in NM. Contributed by Hu Ziqian.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/linux/resources/CGroupsHandlerImpl.java

@@ -96,7 +96,9 @@ class CGroupsHandlerImpl implements CGroupsHandler {
         NM_LINUX_CONTAINER_CGROUPS_MOUNT_PATH, null);
     this.deleteCGroupTimeout = conf.getLong(
         YarnConfiguration.NM_LINUX_CONTAINER_CGROUPS_DELETE_TIMEOUT,
-        YarnConfiguration.DEFAULT_NM_LINUX_CONTAINER_CGROUPS_DELETE_TIMEOUT);
+        YarnConfiguration.DEFAULT_NM_LINUX_CONTAINER_CGROUPS_DELETE_TIMEOUT) +
+        conf.getLong(YarnConfiguration.NM_SLEEP_DELAY_BEFORE_SIGKILL_MS,
+            YarnConfiguration.DEFAULT_NM_SLEEP_DELAY_BEFORE_SIGKILL_MS) + 1000;
     this.deleteCGroupDelay =
         conf.getLong(YarnConfiguration.NM_LINUX_CONTAINER_CGROUPS_DELETE_DELAY,
             YarnConfiguration.DEFAULT_NM_LINUX_CONTAINER_CGROUPS_DELETE_DELAY);