zhijiangW commented on a change in pull request #11408: 
[FLINK-15989][FLINK-16225] Improve direct and metaspace out-of-memory error 
handling
URL: https://github.com/apache/flink/pull/11408#discussion_r394328761
 
 

 ##########
 File path: 
flink-core/src/main/java/org/apache/flink/core/memory/MemorySegmentFactory.java
 ##########
 @@ -94,7 +99,15 @@ public static MemorySegment 
allocateUnpooledOffHeapMemory(int size) {
         * @return A new memory segment, backed by unpooled off-heap memory.
         */
        public static MemorySegment allocateUnpooledOffHeapMemory(int size, 
Object owner) {
-               ByteBuffer memory = ByteBuffer.allocateDirect(size);
+               ByteBuffer memory;
+               try {
+                       memory = ByteBuffer.allocateDirect(size);
+               } catch (OutOfMemoryError e) {
+                       if (ExceptionUtils.isDirectOutOfMemoryError(e)) {
+                               
LOG.error(ExceptionUtils.TM_DIRECT_OOM_ERROR_MESSAGE, e);
+                       }
+                       throw e;
+               }
 
 Review comment:
   > But if the receiver sees the exception, then the user will see it in the 
logs, right?
   Yes.

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