Hadoop: add BufferedByteBufferReadableInputStream

fix https://github.com/chrislusf/seaweedfs/issues/1645

other/java/hdfs2/src/main/java/seaweed/hdfs/BufferedByteBufferReadableInputStream.java

@@ -0,0 +1,25 @@
+package seaweed.hdfs;
+
+import org.apache.hadoop.fs.*;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+public class BufferedByteBufferReadableInputStream extends BufferedFSInputStream implements ByteBufferReadable {
+
+    public BufferedByteBufferReadableInputStream(FSInputStream in, int size) {
+        super(in, size);
+        if (!(in instanceof Seekable) || !(in instanceof PositionedReadable)) {
+            throw new IllegalArgumentException("In is not an instance of Seekable or PositionedReadable");
+        }
+    }
+
+    @Override
+    public int read(ByteBuffer buf) throws IOException {
+        if (this.in instanceof ByteBufferReadable) {
+            return ((ByteBufferReadable)this.in).read(buf);
+        } else {
+            throw new UnsupportedOperationException("Byte-buffer read unsupported by input stream");
+        }
+    }
+}

other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystem.java

@@ -82,7 +82,7 @@ public class SeaweedFileSystem extends FileSystem {
         try {
             int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
             FSInputStream inputStream = seaweedFileSystemStore.openFileForRead(path, statistics);
-            return new FSDataInputStream(new BufferedFSInputStream(inputStream, 4 * seaweedBufferSize));
+            return new FSDataInputStream(new BufferedByteBufferReadableInputStream(inputStream, 4 * seaweedBufferSize));
         } catch (Exception ex) {
             LOG.warn("open path: {} bufferSize:{}", path, bufferSize, ex);
             return null;

other/java/hdfs3/src/main/java/seaweed/hdfs/BufferedByteBufferReadableInputStream.java

@@ -0,0 +1,25 @@
+package seaweed.hdfs;
+
+import org.apache.hadoop.fs.*;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+public class BufferedByteBufferReadableInputStream extends BufferedFSInputStream implements ByteBufferReadable {
+
+    public BufferedByteBufferReadableInputStream(FSInputStream in, int size) {
+        super(in, size);
+        if (!(in instanceof Seekable) || !(in instanceof PositionedReadable)) {
+            throw new IllegalArgumentException("In is not an instance of Seekable or PositionedReadable");
+        }
+    }
+
+    @Override
+    public int read(ByteBuffer buf) throws IOException {
+        if (this.in instanceof ByteBufferReadable) {
+            return ((ByteBufferReadable)this.in).read(buf);
+        } else {
+            throw new UnsupportedOperationException("Byte-buffer read unsupported by input stream");
+        }
+    }
+}

other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedFileSystem.java

@@ -82,7 +82,7 @@ public class SeaweedFileSystem extends FileSystem {
         try {
             int seaweedBufferSize = this.getConf().getInt(FS_SEAWEED_BUFFER_SIZE, FS_SEAWEED_DEFAULT_BUFFER_SIZE);
             FSInputStream inputStream = seaweedFileSystemStore.openFileForRead(path, statistics);
-            return new FSDataInputStream(new BufferedFSInputStream(inputStream, 4 * seaweedBufferSize));
+            return new FSDataInputStream(new BufferedByteBufferReadableInputStream(inputStream, 4 * seaweedBufferSize));
         } catch (Exception ex) {
             LOG.warn("open path: {} bufferSize:{}", path, bufferSize, ex);
             return null;

other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedInputStream.java

@@ -65,14 +65,8 @@ public class SeaweedInputStream extends FSInputStream implements ByteBufferReada
     }
 
     @Override
-    public synchronized int read(final byte[] b, final int off, final int len) throws IOException {
+    public int read(final byte[] b, final int off, final int len) throws IOException {
 
-        if (position < 0) {
-            throw new IllegalArgumentException("attempting to read from negative offset");
-        }
-        if (position >= contentLength) {
-            return -1;  // Hadoop prefers -1 to EOFException
-        }
         if (b == null) {
             throw new IllegalArgumentException("null byte array passed in to read() method");
         }