jubins commented on code in PR #28226:
URL: https://github.com/apache/flink/pull/28226#discussion_r3314516081


##########
flink-runtime/src/test/java/org/apache/flink/runtime/rest/handler/application/ApplicationExceptionsHandlerTest.java:
##########
@@ -143,6 +159,116 @@ void testExceptionWithJobId() throws Exception {
         assertThat(exceptionInfo.getJobId()).isEqualTo(jobId);
     }
 
+    @Test
+    void testMaxExceptionsLimitsHistorySize() throws Exception {
+        final List<ApplicationExceptionHistoryEntry> exceptionHistory = new 
ArrayList<>();
+        for (int i = 0; i < 5; i++) {
+            exceptionHistory.add(
+                    new ApplicationExceptionHistoryEntry(
+                            new RuntimeException("exception #" + i),
+                            System.currentTimeMillis(),
+                            null));
+        }
+
+        final ArchivedApplication applicationWithExceptions =
+                new ArchivedApplication(
+                        archivedApplication.getApplicationId(),
+                        archivedApplication.getApplicationName(),
+                        ApplicationState.FAILED,
+                        new long[] {1L, 1L, 1L, 1L, 1L, 1L, 1L},
+                        Collections.emptyMap(),
+                        exceptionHistory);
+
+        testingRestfulGateway =
+                new TestingRestfulGateway.Builder()
+                        .setRequestApplicationFunction(
+                                applicationId ->
+                                        CompletableFuture.completedFuture(
+                                                applicationWithExceptions))
+                        .build();
+
+        final HandlerRequest<EmptyRequestBody> limitedRequest =
+                createRequest(archivedApplication.getApplicationId(), 2);
+
+        final ApplicationExceptionsInfoWithHistory response =
+                handler.handleRequest(limitedRequest, 
testingRestfulGateway).get();
+
+        assertThat(response.getExceptionHistory().getEntries()).hasSize(2);
+    }
+
+    @Test
+    void testDefaultCapAppliedWhenMaxExceptionsNotProvided() throws Exception {
+        final int totalExceptions = 
ApplicationExceptionsHandler.MAX_NUMBER_EXCEPTION_TO_REPORT + 5;
+        final List<ApplicationExceptionHistoryEntry> exceptionHistory = new 
ArrayList<>();
+        for (int i = 0; i < totalExceptions; i++) {
+            exceptionHistory.add(
+                    new ApplicationExceptionHistoryEntry(
+                            new RuntimeException("exception #" + i),
+                            System.currentTimeMillis(),
+                            null));
+        }
+
+        final ArchivedApplication applicationWithExceptions =
+                new ArchivedApplication(
+                        archivedApplication.getApplicationId(),
+                        archivedApplication.getApplicationName(),
+                        ApplicationState.FAILED,
+                        new long[] {1L, 1L, 1L, 1L, 1L, 1L, 1L},
+                        Collections.emptyMap(),
+                        exceptionHistory);
+
+        testingRestfulGateway =
+                new TestingRestfulGateway.Builder()
+                        .setRequestApplicationFunction(
+                                applicationId ->
+                                        CompletableFuture.completedFuture(
+                                                applicationWithExceptions))
+                        .build();
+
+        final ApplicationExceptionsInfoWithHistory response =
+                handler.handleRequest(handlerRequest, 
testingRestfulGateway).get();
+
+        assertThat(response.getExceptionHistory().getEntries())
+                
.hasSize(ApplicationExceptionsHandler.MAX_NUMBER_EXCEPTION_TO_REPORT);
+    }
+
+    @Test
+    void testMaxExceptionsLargerThanHistorySizeReturnsAllEntries() throws 
Exception {
+        final List<ApplicationExceptionHistoryEntry> exceptionHistory = new 
ArrayList<>();
+        for (int i = 0; i < 3; i++) {

Review Comment:
   good catch, extracted to `historySize`, and derived `oversizedMaxExceptions 
= historySize + 7` so the intent is explicit in the loop bound and the 
assertion. Applied the same treatment to `testMaxExceptionsLimitsHistorySize` 
for consistency.



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