[GitHub] [flink] shixiaogang commented on issue #8269: [FLINK-12285][test] Harden savepoint relevant test cases by explicitly canceling test job

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shixiaogang commented on issue #8269: [FLINK-12285][test] Harden savepoint relevant test cases by explicitly canceling test job
URL: https://github.com/apache/flink/pull/8269#issuecomment-486906606
 
 
   > most of these should have no positive effect since the `MiniClusterResource` is shut down at the end of the test.
   
   @zentol The problem here is that MiniCluster cannot correctly release memory when it's shutdown. When there exist tasks running in TaskExecutors, TaskExecutors will throw exceptions and will not release direct memory for network buffers and memory manager. Succeeding tests running in the same JVM process may fail due to insufficient amount of direct memory.
   
   The problem can be reproduced when changing the settings of MiniCluster, including the number of network buffers, the number of task managers, the number of slots in task managers, and slot sharing.  
   

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