HDFS-7829. Code clean up for LocatedBlock. Contributed by Takanobu Asanuma.

(cherry picked from commit a6a5aae472d015d2ea5cd746719485dff93873a8)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -13,6 +13,8 @@ Release 2.8.0 - UNRELEASED
     HDFS-7835. make initial sleeptime in locateFollowingBlock configurable for
     DFSClient. (Zhihai Xu via Yongjun Zhang)
 
+    HDFS-7829. Code clean up for LocatedBlock. (Takanobu Asanuma via jing9)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/LocatedBlock.java

@@ -44,9 +44,9 @@ public class LocatedBlock {
   private long offset;  // offset of the first byte of the block in the file
   private final DatanodeInfoWithStorage[] locs;
   /** Cached storage ID for each replica */
-  private String[] storageIDs;
+  private final String[] storageIDs;
   /** Cached storage type for each replica, if reported. */
-  private StorageType[] storageTypes;
+  private final StorageType[] storageTypes;
   // corrupt flag is true if all of the replicas of a block are corrupt.
   // else false. If block has few corrupt replicas, they are filtered and 
   // their locations are not part of this object
@@ -62,16 +62,8 @@ public class LocatedBlock {
       new DatanodeInfoWithStorage[0];
 
   public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs) {
-    this(b, locs, -1, false); // startOffset is unknown
-  }
-
-  public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs, long startOffset, 
-                      boolean corrupt) {
-    this(b, locs, null, null, startOffset, corrupt, EMPTY_LOCS);
-  }
-
-  public LocatedBlock(ExtendedBlock b, DatanodeStorageInfo[] storages) {
-    this(b, storages, -1, false); // startOffset is unknown
+    // By default, startOffset is unknown(-1) and corrupt is false.
+    this(b, locs, null, null, -1, false, EMPTY_LOCS);
   }
 
   public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs,
@@ -170,11 +162,11 @@ public class LocatedBlock {
     return b.getNumBytes();
   }
 
-  void setStartOffset(long value) {
+  public void setStartOffset(long value) {
     this.offset = value;
   }
 
-  void setCorrupt(boolean corrupt) {
+  public void setCorrupt(boolean corrupt) {
     this.corrupt = corrupt;
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/LocatedBlocks.java

@@ -119,7 +119,7 @@ public class LocatedBlocks {
   public int findBlock(long offset) {
     // create fake block of size 0 as a key
     LocatedBlock key = new LocatedBlock(
-        new ExtendedBlock(), new DatanodeInfo[0], 0L, false);
+        new ExtendedBlock(), new DatanodeInfo[0]);
     key.setStartOffset(offset);
     key.getBlock().setNumBytes(1);
     Comparator<LocatedBlock> comp = 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -3292,7 +3292,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     final DatanodeStorageInfo[] targets = blockManager.chooseTarget4AdditionalDatanode(
         src, numAdditionalNodes, clientnode, chosen, 
         excludes, preferredblocksize, storagePolicyID);
-    final LocatedBlock lb = new LocatedBlock(blk, targets);
+    final LocatedBlock lb = new LocatedBlock(blk, targets, -1, false);
     blockManager.setBlockToken(lb, AccessMode.COPY);
     return lb;
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/BlockRecoveryCommand.java

@@ -61,7 +61,7 @@ public class BlockRecoveryCommand extends DatanodeCommand {
      * Create RecoveringBlock.
      */
     public RecoveringBlock(ExtendedBlock b, DatanodeInfo[] locs, long newGS) {
-      super(b, locs, -1, false); // startOffset is unknown
+      super(b, locs); // startOffset is unknown
       this.newGenerationStamp = newGS;
       this.recoveryBlock = null;
     }
@@ -71,7 +71,7 @@ public class BlockRecoveryCommand extends DatanodeCommand {
      */
     public RecoveringBlock(ExtendedBlock b, DatanodeInfo[] locs,
         Block recoveryBlock) {
-      super(b, locs, -1, false); // startOffset is unknown
+      super(b, locs); // startOffset is unknown
       this.newGenerationStamp = recoveryBlock.getGenerationStamp();
       this.recoveryBlock = recoveryBlock;
     }

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

@@ -489,9 +489,8 @@ public class TestDFSClientRetries {
         goodLocatedBlock.getBlock(),
         new DatanodeInfo[] {
           DFSTestUtil.getDatanodeInfo("1.2.3.4", "bogus", 1234)
-        },
-        goodLocatedBlock.getStartOffset(),
-        false);
+        });
+      badLocatedBlock.setStartOffset(goodLocatedBlock.getStartOffset());
 
 
       List<LocatedBlock> badBlocks = new ArrayList<LocatedBlock>();

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

@@ -99,11 +99,15 @@ public class TestDFSUtil {
 
     // ok
     ExtendedBlock b1 = new ExtendedBlock("bpid", 1, 1, 1);
-    LocatedBlock l1 = new LocatedBlock(b1, ds, 0, false);
+    LocatedBlock l1 = new LocatedBlock(b1, ds);
+    l1.setStartOffset(0);
+    l1.setCorrupt(false);
 
     // corrupt
     ExtendedBlock b2 = new ExtendedBlock("bpid", 2, 1, 1);
-    LocatedBlock l2 = new LocatedBlock(b2, ds, 0, true);
+    LocatedBlock l2 = new LocatedBlock(b2, ds);
+    l2.setStartOffset(0);
+    l2.setCorrupt(true);
 
     List<LocatedBlock> ls = Arrays.asList(l1, l2);
     LocatedBlocks lbs = new LocatedBlocks(10, false, ls, l2, true, null);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocolPB/TestPBHelper.java

@@ -478,10 +478,11 @@ public class TestPBHelper {
                                          AdminStates.NORMAL)
     };
     LocatedBlock lb = new LocatedBlock(
-        new ExtendedBlock("bp12", 12345, 10, 53), dnInfos, 5, false);
+        new ExtendedBlock("bp12", 12345, 10, 53), dnInfos);
     lb.setBlockToken(new Token<BlockTokenIdentifier>(
         "identifier".getBytes(), "password".getBytes(), new Text("kind"),
         new Text("service")));
+    lb.setStartOffset(5);
     return lb;
   }