HDFS-13210. Fix the typo in MiniDFSCluster class. Contributed by fang zhenyi.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/MiniDFSCluster.java

@@ -2745,7 +2745,8 @@ public class MiniDFSCluster implements AutoCloseable {
     final DataNode dn = dataNodes.get(dataNodeIndex).datanode;
     final FsDatasetSpi<?> dataSet = DataNodeTestUtils.getFSDataset(dn);
     if (!(dataSet instanceof SimulatedFSDataset)) {
-      throw new IOException("injectBlocks is valid only for SimilatedFSDataset");
+      throw new IOException("injectBlocks is valid only for" +
+          " SimulatedFSDataset");
     }
     if (bpid == null) {
       bpid = getNamesystem().getBlockPoolId();
@@ -2766,7 +2767,8 @@ public class MiniDFSCluster implements AutoCloseable {
     final DataNode dn = dataNodes.get(dataNodeIndex).datanode;
     final FsDatasetSpi<?> dataSet = DataNodeTestUtils.getFSDataset(dn);
     if (!(dataSet instanceof SimulatedFSDataset)) {
-      throw new IOException("injectBlocks is valid only for SimilatedFSDataset");
+      throw new IOException("injectBlocks is valid only for" +
+          " SimulatedFSDataset");
     }
     String bpid = getNamesystem(nameNodeIndex).getBlockPoolId();
     SimulatedFSDataset sdataset = (SimulatedFSDataset) dataSet;