BIGTOP-627. Add HBase balancer test (Stephen Chu via rvs)

git-svn-id: https://svn.apache.org/repos/asf/incubator/bigtop/trunk@1351430 13f79535-47bb-0310-9956-ffa450edef68

bigtop-tests/test-artifacts/hbase/src/main/groovy/org/apache/bigtop/itest/hbase/smoke/TestHBaseBalancer.groovy

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+/**
+ * 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.bigtop.itest.hbase.smoke
+
+import org.junit.Test
+import org.apache.bigtop.itest.shell.Shell
+import static org.apache.bigtop.itest.LogErrorsUtils.logError
+import static org.junit.Assert.assertTrue
+
+/**
+ * Tests the HBase balancer tool via the HBase shell.
+ */
+class TestHBaseBalancer {
+  private static Shell sh = new Shell("hbase shell")
+  private static String balancer = "balancer"
+  private static String balanceSwitchTrue = "balance_switch true"
+  private static String balanceSwitchFalse = "balance_switch false"
+
+  @Test
+  void testBalancer() {
+    // Enable the balancer.
+    sh.exec(balanceSwitchTrue)
+    logError(sh)
+    assertTrue(sh.getRet() == 0)
+
+    /* Record the original state of the balancer switch. HBASE-5953
+     * should allow us to get the state in an easier manner. */
+    String origState = balanceSwitchTrue
+    if (sh.getOut().toString().indexOf("false") != -1) {
+      origState = balanceSwitchFalse
+    }
+
+    // Run the balancer.
+    sh.exec(balancer)
+    logError(sh)
+    assertTrue(sh.getRet() == 0)
+
+    // Disable the balancer, and verify its previous state to be true.
+    sh.exec(balanceSwitchFalse)
+    logError(sh)
+    assertTrue(sh.getRet() == 0)
+    assertTrue("balance_switch failed switching to true",
+               sh.getOut().toString().indexOf("true") != -1)
+
+    // Return balancer switch to original state, and verify its
+    // previous state to be false.
+    sh.exec(origState)
+    logError(sh)
+    assertTrue(sh.getRet() == 0)
+    assertTrue("balance_switch failed switching to false",
+               sh.getOut().toString().indexOf("false") != -1)
+  }
+}