HBASE-23635 Reduced number of Checkstyle violations in hbase-mapreduce

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/TestPerformanceEvaluation.java

@@ -18,6 +18,7 @@
 package org.apache.hadoop.hbase;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
@@ -53,7 +54,6 @@
 
 @Category({MiscTests.class, SmallTests.class})
 public class TestPerformanceEvaluation {
-
   @ClassRule
   public static final HBaseClassTestRule CLASS_RULE =
       HBaseClassTestRule.forClass(TestPerformanceEvaluation.class);
@@ -64,19 +64,19 @@ public class TestPerformanceEvaluation {
   public void testDefaultInMemoryCompaction() {
     PerformanceEvaluation.TestOptions defaultOpts =
         new PerformanceEvaluation.TestOptions();
-    assertEquals(CompactingMemStore.COMPACTING_MEMSTORE_TYPE_DEFAULT.toString(),
+    assertEquals(CompactingMemStore.COMPACTING_MEMSTORE_TYPE_DEFAULT,
         defaultOpts.getInMemoryCompaction().toString());
     HTableDescriptor htd = PerformanceEvaluation.getTableDescriptor(defaultOpts);
     for (HColumnDescriptor hcd: htd.getFamilies()) {
-      assertEquals(CompactingMemStore.COMPACTING_MEMSTORE_TYPE_DEFAULT.toString(),
+      assertEquals(CompactingMemStore.COMPACTING_MEMSTORE_TYPE_DEFAULT,
           hcd.getInMemoryCompaction().toString());
     }
   }
 
   @Test
-  public void testSerialization() throws IOException {
+  public void testSerialization() {
     PerformanceEvaluation.TestOptions options = new PerformanceEvaluation.TestOptions();
-    assertTrue(!options.isAutoFlush());
+    assertFalse(options.isAutoFlush());
     options.setAutoFlush(true);
     Gson gson = GsonUtil.createGson().create();
     String optionsString = gson.toJson(options);
@@ -101,8 +101,7 @@ public void testWriteInputFile() throws IOException {
     long len = fs.getFileStatus(p).getLen();
     assertTrue(len > 0);
     byte[] content = new byte[(int) len];
-    FSDataInputStream dis = fs.open(p);
-    try {
+    try (FSDataInputStream dis = fs.open(p)) {
       dis.readFully(content);
       BufferedReader br = new BufferedReader(
         new InputStreamReader(new ByteArrayInputStream(content), StandardCharsets.UTF_8));
@@ -111,8 +110,6 @@ public void testWriteInputFile() throws IOException {
         count++;
       }
       assertEquals(clients, count);
-    } finally {
-      dis.close();
     }
   }
 
@@ -170,9 +167,8 @@ public void testRandomReadCalculation() {
   }
 
   @Test
-  public void testZipfian()
-  throws NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException,
-      IllegalArgumentException, InvocationTargetException {
+  public void testZipfian() throws NoSuchMethodException, SecurityException, InstantiationException,
+      IllegalAccessException, IllegalArgumentException, InvocationTargetException {
     TestOptions opts = new PerformanceEvaluation.TestOptions();
     opts.setValueZipf(true);
     final int valueSize = 1024;
@@ -197,10 +193,10 @@ public void testZipfian()
   public void testSetBufferSizeOption() {
     TestOptions opts = new PerformanceEvaluation.TestOptions();
     long bufferSize = opts.getBufferSize();
-    assertEquals(bufferSize, 2l * 1024l * 1024l);
-    opts.setBufferSize(64l * 1024l);
+    assertEquals(bufferSize, 2L * 1024L * 1024L);
+    opts.setBufferSize(64L * 1024L);
     bufferSize = opts.getBufferSize();
-    assertEquals(bufferSize, 64l * 1024l);
+    assertEquals(bufferSize, 64L * 1024L);
   }
 
   @Test
@@ -265,7 +261,7 @@ public void testParseOptsMultiPuts() {
     assertNotNull(options);
     assertNotNull(options.getCmdName());
     assertEquals(cmdName, options.getCmdName());
-    assertTrue(options.getMultiPut() == 10);
+    assertEquals(10, options.getMultiPut());
   }
 
   @Test
@@ -288,6 +284,6 @@ public void testParseOptsConnCount() {
     assertNotNull(options);
     assertNotNull(options.getCmdName());
     assertEquals(cmdName, options.getCmdName());
-    assertTrue(options.getConnCount() == 10);
+    assertEquals(10, options.getConnCount());
   }
 }

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/NMapInputFormat.java

@@ -20,7 +20,6 @@
 
 import java.io.DataInput;
 import java.io.DataOutput;
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -44,14 +43,12 @@ public class NMapInputFormat extends InputFormat<NullWritable, NullWritable> {
 
   @Override
   public RecordReader<NullWritable, NullWritable> createRecordReader(
-      InputSplit split,
-      TaskAttemptContext tac) throws IOException, InterruptedException {
+      InputSplit split, TaskAttemptContext tac) {
     return new SingleRecordReader<>(NullWritable.get(), NullWritable.get());
   }
 
   @Override
-  public List<InputSplit> getSplits(JobContext context) throws IOException,
-      InterruptedException {
+  public List<InputSplit> getSplits(JobContext context) {
     int count = getNumMapTasks(context.getConfiguration());
     List<InputSplit> splits = new ArrayList<>(count);
     for (int i = 0; i < count; i++) {
@@ -70,21 +67,21 @@ public static int getNumMapTasks(Configuration conf) {
 
   private static class NullInputSplit extends InputSplit implements Writable {
     @Override
-    public long getLength() throws IOException, InterruptedException {
+    public long getLength() {
       return 0;
     }
 
     @Override
-    public String[] getLocations() throws IOException, InterruptedException {
+    public String[] getLocations() {
       return new String[] {};
     }
 
     @Override
-    public void readFields(DataInput in) throws IOException {
+    public void readFields(DataInput in) {
     }
 
     @Override
-    public void write(DataOutput out) throws IOException {
+    public void write(DataOutput out) {
     }
   }
 
@@ -125,10 +122,12 @@ public void initialize(InputSplit split, TaskAttemptContext tac) {
 
     @Override
     public boolean nextKeyValue() {
-      if (providedKey) return false;
+      if (providedKey) {
+        return false;
+      }
+
       providedKey = true;
       return true;
     }
-
   }
 }

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TableSnapshotInputFormatTestBase.java

@@ -15,7 +15,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package org.apache.hadoop.hbase.mapreduce;
 
 import static org.junit.Assert.assertFalse;
@@ -80,8 +79,8 @@ protected abstract void testWithMockedMapReduce(HBaseTestingUtility util, String
     throws Exception;
 
   protected abstract void testWithMapReduceImpl(HBaseTestingUtility util, TableName tableName,
-    String snapshotName, Path tableDir, int numRegions, int numSplitsPerRegion, int expectedNumSplits,
-    boolean shutdownCluster) throws Exception;
+    String snapshotName, Path tableDir, int numRegions, int numSplitsPerRegion,
+    int expectedNumSplits, boolean shutdownCluster) throws Exception;
 
   protected abstract byte[] getStartRow();
 
@@ -158,7 +157,8 @@ public abstract void testRestoreSnapshotDoesNotCreateBackRefLinksInit(TableName
       String snapshotName, Path tmpTableDir) throws Exception;
 
   protected void testWithMapReduce(HBaseTestingUtility util, String snapshotName,
-      int numRegions, int numSplitsPerRegion, int expectedNumSplits, boolean shutdownCluster) throws Exception {
+      int numRegions, int numSplitsPerRegion, int expectedNumSplits, boolean shutdownCluster)
+      throws Exception {
     setupCluster();
     try {
       Path tableDir = util.getDataTestDirOnTestFS(snapshotName);
@@ -182,10 +182,11 @@ protected static void verifyRowFromMap(ImmutableBytesWritable key, Result result
         cell.getRowArray(), cell.getRowOffset(), cell.getRowLength()));
     }
 
-    for (int j = 0; j < FAMILIES.length; j++) {
-      byte[] actual = result.getValue(FAMILIES[j], FAMILIES[j]);
-      Assert.assertArrayEquals("Row in snapshot does not match, expected:" + Bytes.toString(row)
-        + " ,actual:" + Bytes.toString(actual), row, actual);
+    for (byte[] family : FAMILIES) {
+      byte[] actual = result.getValue(family, family);
+      Assert.assertArrayEquals(
+        "Row in snapshot does not match, expected:" + Bytes.toString(row) + " ,actual:" + Bytes
+          .toString(actual), row, actual);
     }
   }
 
@@ -226,5 +227,4 @@ protected static void createTableAndSnapshot(HBaseTestingUtility util, TableName
     admin.flush(tableName);
     table.close();
   }
-
 }