fix remote register model / circuit breaker 500 (#2264) (#2273)

* move memory CB check into try block to catch exception and hand to listener for register remote model

Signed-off-by: Henry Lindeman <[email protected]>

* add test that memory cb exception is caught by action listener

Signed-off-by: Henry Lindeman <[email protected]>

* unthrow priviledgedExceptionAction

Signed-off-by: Henry Lindeman <[email protected]>

---------

Signed-off-by: Henry Lindeman <[email protected]>
(cherry picked from commit 30642e6)

Co-authored-by: Henry Lindeman <[email protected]>

Author: opensearch-trigger-bot[bot]

plugin/src/main/java/org/opensearch/ml/model/MLModelManager.java

@@ -345,8 +345,8 @@ public void registerMLRemoteModel(
         MLTask mlTask,
         ActionListener<MLRegisterModelResponse> listener
     ) {
-        checkAndAddRunningTask(mlTask, maxRegisterTasksPerNode);
         try (ThreadContext.StoredContext context = client.threadPool().getThreadContext().stashContext()) {
+            checkAndAddRunningTask(mlTask, maxRegisterTasksPerNode);
             mlStats.getStat(MLNodeLevelStat.ML_REQUEST_COUNT).increment();
             mlStats.createCounterStatIfAbsent(mlTask.getFunctionName(), REGISTER, ML_ACTION_REQUEST_COUNT).increment();
             mlStats.getStat(MLNodeLevelStat.ML_EXECUTING_TASK_COUNT).increment();

plugin/src/test/java/org/opensearch/ml/model/MLModelManagerTests.java

@@ -82,6 +82,7 @@
 import org.opensearch.core.action.ActionListener;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.ml.breaker.MLCircuitBreakerService;
+import org.opensearch.ml.breaker.MemoryCircuitBreaker;
 import org.opensearch.ml.breaker.ThresholdCircuitBreaker;
 import org.opensearch.ml.cluster.DiscoveryNodeHelper;
 import org.opensearch.ml.common.FunctionName;
@@ -112,6 +113,7 @@
 import org.opensearch.ml.stats.MLStats;
 import org.opensearch.ml.stats.suppliers.CounterSupplier;
 import org.opensearch.ml.task.MLTaskManager;
+import org.opensearch.monitor.jvm.JvmService;
 import org.opensearch.script.ScriptService;
 import org.opensearch.test.OpenSearchTestCase;
 import org.opensearch.threadpool.ThreadPool;
@@ -449,6 +451,23 @@ public void testRegisterMLRemoteModel() throws PrivilegedActionException {
         verify(mlTaskManager).updateMLTask(anyString(), anyMap(), anyLong(), anyBoolean());
     }
 
+    public void testRegisterMLRemoteModel_WhenMemoryCBOpen_ThenFail() {
+        ActionListener<MLRegisterModelResponse> listener = mock(ActionListener.class);
+        MemoryCircuitBreaker memCB = new MemoryCircuitBreaker(mock(JvmService.class));
+        String memCBIsOpenMessage = memCB.getName() + " is open, please check your resources!";
+        when(mlCircuitBreakerService.checkOpenCB()).thenThrow(new MLLimitExceededException(memCBIsOpenMessage));
+
+        MLRegisterModelInput pretrainedInput = mockRemoteModelInput(true);
+        MLTask pretrainedTask = MLTask.builder().taskId("pretrained").modelId("pretrained").functionName(FunctionName.REMOTE).build();
+        modelManager.registerMLRemoteModel(pretrainedInput, pretrainedTask, listener);
+
+        ArgumentCaptor<Exception> argCaptor = ArgumentCaptor.forClass(Exception.class);
+        verify(listener, times(1)).onFailure(argCaptor.capture());
+        Exception e = argCaptor.getValue();
+        assertTrue(e instanceof MLLimitExceededException);
+        assertEquals(memCBIsOpenMessage, e.getMessage());
+    }
+
     public void testIndexRemoteModel() throws PrivilegedActionException {
         ActionListener<MLRegisterModelResponse> listener = mock(ActionListener.class);
         doNothing().when(mlTaskManager).checkLimitAndAddRunningTask(any(), any());