HBASE-24831 : Addendum for source compatibility

Closes #2403

Signed-off-by: Nick Dimiduk <[email protected]>

Author: virajjasani

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/TableRecordReaderImpl.java

@@ -18,6 +18,7 @@
 package org.apache.hadoop.hbase.mapreduce;
 
 import java.io.IOException;
+import java.lang.reflect.Method;
 import java.util.Map;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.DoNotRetryIOException;
@@ -95,6 +96,27 @@ public void restart(byte[] firstRow) throws IOException {
     }
   }
 
+  /**
+   * In new mapreduce APIs, TaskAttemptContext has two getCounter methods
+   * Check if getCounter(String, String) method is available.
+   * @return The getCounter method or null if not available.
+   * @deprecated since 2.4.0 and 2.3.2, will be removed in 4.0.0
+   */
+  @Deprecated
+  protected static Method retrieveGetCounterWithStringsParams(TaskAttemptContext context)
+    throws IOException {
+    Method m = null;
+    try {
+      m = context.getClass().getMethod("getCounter",
+        new Class [] {String.class, String.class});
+    } catch (SecurityException e) {
+      throw new IOException("Failed test for getCounter", e);
+    } catch (NoSuchMethodException e) {
+      // Ignore
+    }
+    return m;
+  }
+
   /**
    * Sets the HBase table.
    * @param htable The table to scan.
@@ -267,6 +289,16 @@ private void updateCounters() {
     updateCounters(scanMetrics, numRestarts, context, numStale);
   }
 
+  /**
+   * @deprecated since 2.4.0 and 2.3.2, will be removed in 4.0.0
+   *   Use {@link #updateCounters(ScanMetrics, long, TaskAttemptContext, long)} instead.
+   */
+  @Deprecated
+  protected static void updateCounters(ScanMetrics scanMetrics, long numScannerRestarts,
+      Method getCounter, TaskAttemptContext context, long numStale) {
+    updateCounters(scanMetrics, numScannerRestarts, context, numStale);
+  }
+
   protected static void updateCounters(ScanMetrics scanMetrics, long numScannerRestarts,
       TaskAttemptContext context, long numStale) {
     // we can get access to counters only if hbase uses new mapreduce APIs