HADOOP-12065 Using more meaningful keys in EC schema. Contributed by Kai Zheng

hadoop-common-project/hadoop-common/CHANGES-HDFS-EC-7285.txt

@@ -64,4 +64,6 @@
     (Kai Zheng)
 
     HADOOP-12011. Allow to dump verbose information to ease debugging in raw erasure coders
-    (Kai Zheng)
+    (Kai Zheng)
+
+    HADOOP-12065. Using more meaningful keys in EC schema. (Kai Zheng)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ECSchema.java

@@ -25,8 +25,8 @@ import java.util.Map;
  * Erasure coding schema to housekeeper relevant information.
  */
 public final class ECSchema {
-  public static final String NUM_DATA_UNITS_KEY = "k";
-  public static final String NUM_PARITY_UNITS_KEY = "m";
+  public static final String NUM_DATA_UNITS_KEY = "numDataUnits";
+  public static final String NUM_PARITY_UNITS_KEY = "numParityUnits";
   public static final String CODEC_NAME_KEY = "codec";
 
   /**

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/erasurecode/TestSchemaLoader.java

@@ -40,13 +40,13 @@ public class TestSchemaLoader {
     out.println("<?xml version=\"1.0\"?>");
     out.println("<schemas>");
     out.println("  <schema name=\"RSk6m3\">");
-    out.println("    <k>6</k>");
-    out.println("    <m>3</m>");
+    out.println("    <numDataUnits>6</numDataUnits>");
+    out.println("    <numParityUnits>3</numParityUnits>");
     out.println("    <codec>RS</codec>");
     out.println("  </schema>");
     out.println("  <schema name=\"RSk10m4\">");
-    out.println("    <k>10</k>");
-    out.println("    <m>4</m>");
+    out.println("    <numDataUnits>10</numDataUnits>");
+    out.println("    <numParityUnits>4</numParityUnits>");
     out.println("    <codec>RS</codec>");
     out.println("  </schema>");
     out.println("</schemas>");