2 files changed, 26 insertions, 1 deletions
diff --git a/other/java/hdfs2/src/main/java/seaweed/hdfs/BufferedByteBufferReadableInputStream.java b/other/java/hdfs2/src/main/java/seaweed/hdfs/BufferedByteBufferReadableInputStream.java
new file mode 100644
index 000000000..3d0b68a52
--- /dev/null
+++ b/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");
+        }
+    }
+}
diff --git a/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystem.java b/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystem.java
index fb1f4c53b..84f11e846 100644
--- a/other/java/hdfs2/src/main/java/seaweed/hdfs/SeaweedFileSystem.java
+++ b/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;