HBASE-24755 [LOG][RSGroup]Error message is confusing while adding a o…

…ffline RS to rsgroup (apache#2847) (apache#2846)

Signed-off-by: Viraj Jasani <vjasani@apache.org>
Signed-off-by: Wellington Chevreuil <wchevreuil@apache.org>
(cherry picked from commit 821f422)

Change-Id: Iaf5eafc91f2b12dc931f80a40954e4cefe026f7a

hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServer.java

@@ -160,9 +160,9 @@ private void checkServersAndTables(Set<Address> servers, Set<TableName> tables,
     Address firstServer = servers.iterator().next();
     RSGroupInfo tmpSrcGrp = rsGroupInfoManager.getRSGroupOfServer(firstServer);
     if (tmpSrcGrp == null) {
-      // Be careful. This exception message is tested for in TestRSGroupsBase...
-      throw new ConstraintException("Source RSGroup for server " + firstServer
-              + " does not exist.");
+      // Be careful. This exception message is tested for in TestRSGroupsAdmin2...
+      throw new ConstraintException("Server " + firstServer
+        + " is either offline or it does not exist.");
     }
     RSGroupInfo srcGrp = new RSGroupInfo(tmpSrcGrp);
     if (srcGrp.getName().equals(targetGroupName)) {
@@ -292,9 +292,9 @@ public void moveServers(Set<Address> servers, String targetGroupName) throws IOE
       Address firstServer = servers.iterator().next();
       RSGroupInfo srcGrp = rsGroupInfoManager.getRSGroupOfServer(firstServer);
       if (srcGrp == null) {
-        // Be careful. This exception message is tested for in TestRSGroupsBase...
-        throw new ConstraintException("Source RSGroup for server " + firstServer
-            + " does not exist.");
+        // Be careful. This exception message is tested for in TestRSGroupsAdmin2...
+        throw new ConstraintException("Server " + firstServer
+          + " is either offline or it does not exist.");
       }
       if (srcGrp.getName().equals(targetGroupName)) {
         throw new ConstraintException("Target RSGroup " + targetGroupName +

hbase-rsgroup/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin2.java

@@ -181,7 +181,7 @@ public void testMoveServers() throws Exception {
       rsGroupAdmin.moveServers(Sets.newHashSet(Address.fromString("foo:9999")), "foo");
       fail("Bogus servers shouldn't have been successfully moved.");
     } catch (IOException ex) {
-      String exp = "Source RSGroup for server foo:9999 does not exist.";
+      String exp = "Server foo:9999 is either offline or it does not exist.";
       String msg = "Expected '" + exp + "' in exception message: ";
       assertTrue(msg + " " + ex.getMessage(), ex.getMessage().contains(exp));
     }
@@ -329,7 +329,7 @@ public boolean evaluate() throws Exception {
         Sets.newHashSet(tableName), newGroup.getName());
       fail("Bogus servers shouldn't have been successfully moved.");
     } catch (IOException ex) {
-      String exp = "Source RSGroup for server foo:9999 does not exist.";
+      String exp = "Server foo:9999 is either offline or it does not exist.";
       String msg = "Expected '" + exp + "' in exception message: ";
       assertTrue(msg + " " + ex.getMessage(), ex.getMessage().contains(exp));
     }