Add read end flag of SSM Small File

smart-hadoop-support/smart-hadoop-2/src/main/java/org/apache/hadoop/hdfs/CompactInputStream.java

@@ -74,21 +74,33 @@ public List<LocatedBlock> getAllBlocks() throws IOException {
   @Override
   public synchronized int read(final byte[] buf, int off, int len) throws IOException {
     int realLen = (int) Math.min(len, fileContainerInfo.getLength() - getPos());
-    return super.read(buf, off, realLen);
+    if (realLen == 0) {
+      return -1;
+    } else {
+      return super.read(buf, off, realLen);
+    }
   }
 
   @Override
   public synchronized int read(final ByteBuffer buf) throws IOException {
     int realLen = (int) Math.min(buf.remaining(), fileContainerInfo.getLength() - getPos());
-    buf.limit(realLen + buf.position());
-    return super.read(buf);
+    if (realLen == 0) {
+      return -1;
+    } else {
+      buf.limit(realLen + buf.position());
+      return super.read(buf);
+    }
   }
 
   @Override
   public int read(long position, byte[] buffer, int offset, int length) throws IOException {
-    int realLen = (int) Math.min(length, fileContainerInfo.getLength() - getPos());
     long realPos = position + fileContainerInfo.getOffset();
-    return super.read(realPos, buffer, offset, realLen);
+    int realLen = (int) Math.min(length, fileContainerInfo.getLength() - position);
+    if (realLen == 0) {
+      return -1;
+    } else {
+      return super.read(realPos, buffer, offset, realLen);
+    }
   }
 
   @Override

smart-hadoop-support/smart-hadoop-3.1/src/main/java/org/apache/hadoop/hdfs/CompactInputStream.java

@@ -74,21 +74,33 @@ public List<LocatedBlock> getAllBlocks() throws IOException {
   @Override
   public synchronized int read(final byte[] buf, int off, int len) throws IOException {
     int realLen = (int) Math.min(len, fileContainerInfo.getLength() - getPos());
-    return super.read(buf, off, realLen);
+    if (realLen == 0) {
+      return -1;
+    } else {
+      return super.read(buf, off, realLen);
+    }
   }
 
   @Override
   public synchronized int read(final ByteBuffer buf) throws IOException {
     int realLen = (int) Math.min(buf.remaining(), fileContainerInfo.getLength() - getPos());
-    buf.limit(realLen + buf.position());
-    return super.read(buf);
+    if (realLen == 0) {
+      return -1;
+    } else {
+      buf.limit(realLen + buf.position());
+      return super.read(buf);
+    }
   }
 
   @Override
   public int read(long position, byte[] buffer, int offset, int length) throws IOException {
-    int realLen = (int) Math.min(length, fileContainerInfo.getLength() - getPos());
     long realPos = position + fileContainerInfo.getOffset();
-    return super.read(realPos, buffer, offset, realLen);
+    int realLen = (int) Math.min(length, fileContainerInfo.getLength() - position);
+    if (realLen == 0) {
+      return -1;
+    } else {
+      return super.read(realPos, buffer, offset, realLen);
+    }
   }
 
   @Override

smart-hadoop-support/smart-hadoop/src/main/java/org/smartdata/hdfs/action/SmallFileCompactAction.java

@@ -21,8 +21,10 @@
 import com.google.gson.reflect.TypeToken;
 import org.apache.commons.lang.SerializationUtils;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.CreateFlag;
 import org.apache.hadoop.fs.XAttrSetFlag;
 import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.io.IOUtils;
 import org.smartdata.SmartConstants;
@@ -129,6 +131,8 @@ protected void execute() throws Exception {
 
     for (String smallFile : smallFileList) {
       if ((smallFile != null) && !smallFile.isEmpty() && dfsClient.exists(smallFile)) {
+        HdfsDataOutputStream append = dfsClient.append(
+            smallFile, 1024, EnumSet.of(CreateFlag.APPEND), null, null);
         long fileLen = dfsClient.getFileInfo(smallFile).getLen();
         if (fileLen > 0) {
           try (InputStream in = dfsClient.open(smallFile)) {
@@ -138,6 +142,7 @@ protected void execute() throws Exception {
             // Truncate small file, add file container info to XAttr
             CompactFileState compactFileState = new CompactFileState(
                 smallFile, new FileContainerInfo(containerFile, offset, fileLen));
+            append.close();
             truncateAndSetXAttr(smallFile, compactFileState);
 
             // Update compact file state map, offset, status, and log
@@ -148,7 +153,10 @@ protected void execute() throws Exception {
             appendLog(String.format(
                 "Compact %s to %s successfully.", smallFile, containerFile));
           } catch (IOException e) {
-            // Close output stream and put compact file state map into action result
+            // Close append, output streams and put compact file state map into action result
+            if (append != null) {
+              append.close();
+            }
             if (out != null) {
               out.close();
               appendResult(new Gson().toJson(compactFileStates));