HDFS-12289. [READ] HDFS-12091 breaks the tests for provided block reads

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

@@ -147,6 +147,9 @@ public class MiniDFSCluster implements AutoCloseable {
       GenericTestUtils.SYSPROP_TEST_DATA_DIR;
   /** Configuration option to set the data dir: {@value} */
   public static final String HDFS_MINIDFS_BASEDIR = "hdfs.minidfs.basedir";
+  /** Configuration option to set the provided data dir: {@value} */
+  public static final String HDFS_MINIDFS_BASEDIR_PROVIDED =
+      "hdfs.minidfs.basedir.provided";
   public static final String  DFS_NAMENODE_SAFEMODE_EXTENSION_TESTING_KEY
       = DFS_NAMENODE_SAFEMODE_EXTENSION_KEY + ".testing";
   public static final String  DFS_NAMENODE_DECOMMISSION_INTERVAL_TESTING_KEY
@@ -1397,7 +1400,12 @@ public class MiniDFSCluster implements AutoCloseable {
       if ((storageTypes != null) && (j >= storageTypes.length)) {
         break;
       }
-      File dir = getInstanceStorageDir(dnIndex, j);
+      File dir;
+      if (storageTypes != null && storageTypes[j] == StorageType.PROVIDED) {
+        dir = getProvidedStorageDir(dnIndex, j);
+      } else {
+        dir = getInstanceStorageDir(dnIndex, j);
+      }
       dir.mkdirs();
       if (!dir.isDirectory()) {
         throw new IOException("Mkdirs failed to create directory for DataNode " + dir);
@@ -2846,6 +2854,26 @@ public class MiniDFSCluster implements AutoCloseable {
     return new File(base_dir, getStorageDirPath(dnIndex, dirIndex));
   }
 
+  /**
+   * Get a storage directory for PROVIDED storages.
+   * The PROVIDED directory to return can be set by using the configuration
+   * parameter {@link #HDFS_MINIDFS_BASEDIR_PROVIDED}. If this parameter is
+   * not set, this function behaves exactly the same as
+   * {@link #getInstanceStorageDir(int, int)}. Currently, the two parameters
+   * are ignored as only one PROVIDED storage is supported in HDFS-9806.
+   *
+   * @param dnIndex datanode index (starts from 0)
+   * @param dirIndex directory index
+   * @return Storage directory
+   */
+  public File getProvidedStorageDir(int dnIndex, int dirIndex) {
+    String base = conf.get(HDFS_MINIDFS_BASEDIR_PROVIDED, null);
+    if (base == null) {
+      return getInstanceStorageDir(dnIndex, dirIndex);
+    }
+    return new File(base);
+  }
+
   /**
    * Get a storage directory for a datanode.
    * <ol>

hadoop-tools/hadoop-fs2img/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeProvidedImplementation.java

@@ -74,7 +74,7 @@ public class TestNameNodeProvidedImplementation {
   final Random r = new Random();
   final File fBASE = new File(MiniDFSCluster.getBaseDirectory());
   final Path BASE = new Path(fBASE.toURI().toString());
-  final Path NAMEPATH = new Path(BASE, "providedDir");;
+  final Path NAMEPATH = new Path(BASE, "providedDir");
   final Path NNDIRPATH = new Path(BASE, "nnDir");
   final Path BLOCKFILE = new Path(NNDIRPATH, "blocks.csv");
   final String SINGLEUSER = "usr1";
@@ -116,6 +116,8 @@ public class TestNameNodeProvidedImplementation {
         BLOCKFILE.toString());
     conf.set(DFSConfigKeys.DFS_PROVIDED_BLOCK_MAP_DELIMITER, ",");
 
+    conf.set(MiniDFSCluster.HDFS_MINIDFS_BASEDIR_PROVIDED,
+        new File(NAMEPATH.toUri()).toString());
     File imageDir = new File(NAMEPATH.toUri());
     if (!imageDir.exists()) {
       LOG.info("Creating directory: " + imageDir);