wangyang0918 commented on issue #10089: [FLINK-12342][yarn] Remove container requests in order to reduce excess containers URL: https://github.com/apache/flink/pull/10089#issuecomment-550120048 Moving the `removeContainerRequest` first in `onContainersAllocated` is a reasonable fix. And it could reduce the excess containers to some extent. However, it could not solve the problem completely. Uploading a config file to hdfs will take 50ms in many production hdfs cluster. It means only 10 containers could be started. If we receive more than 10 containers, the `CallbackHandlerThread` of yarn am-rm client will be blocked. So `removeContainerRequest` may not be called timely.
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