YARN-10991. Fix to ignore the grouping "[]" for resourcesStr in parseResourcesString method (#3592)

Signed-off-by: Akira Ajisaka <aajisaka@apache.org>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/Client.java

@@ -1373,7 +1373,7 @@ public class Client {
       resourcesStr = resourcesStr.substring(1);
     }
     if (resourcesStr.endsWith("]")) {
-      resourcesStr = resourcesStr.substring(0, resourcesStr.length());
+      resourcesStr = resourcesStr.substring(0, resourcesStr.length() - 1);
     }
 
     for (String resource : resourcesStr.trim().split(",")) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/TestClient.java

@@ -0,0 +1,42 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.yarn.applications.distributedshell;
+
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.Assert.assertEquals;
+
+public class TestClient {
+  @Test
+  public void testParseResourcesString() {
+    // Setup
+    final Map<String, Long> expectedResult = new HashMap<>();
+    expectedResult.put("memory-mb", 3072L);
+    expectedResult.put("vcores", 1L);
+
+    // Run the test
+    final Map<String, Long> result = Client.parseResourcesString("[memory-mb=3072,vcores=1]");
+
+    // Verify the results
+    assertEquals(expectedResult, result);
+  }
+}