simplify

other/java/client/src/main/java/seaweedfs/client/ByteBufferPool.java

@@ -18,6 +18,7 @@ public class ByteBufferPool {
         if (bufferSize < MIN_BUFFER_SIZE) {
             bufferSize = MIN_BUFFER_SIZE;
         }
+        LOG.debug("requested new buffer {}", bufferSize);
         if (bufferList.isEmpty()) {
             return ByteBuffer.allocate(bufferSize);
         }
@@ -33,6 +34,7 @@ public class ByteBufferPool {
     }
 
     public static synchronized void release(ByteBuffer obj) {
+        obj.clear();
         bufferList.add(0, obj);
     }
 

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

@@ -187,7 +187,6 @@ public class SeaweedOutputStream extends OutputStream {
             // System.out.println(path + " is going to save [" + (writePosition) + "," + ((writePosition) + bytesLength) + ")");
             SeaweedWrite.writeData(entry, replication, filerGrpcClient, writePosition, bufferToWrite.array(), bufferToWrite.position(), bufferToWrite.limit());
             // System.out.println(path + " saved [" + (writePosition) + "," + ((writePosition) + bytesLength) + ")");
-            bufferToWrite.clear();
             ByteBufferPool.release(bufferToWrite);
             return null;
         });

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

@@ -234,7 +234,6 @@ public class SeaweedOutputStream extends OutputStream implements Syncable, Strea
             // System.out.println(path + " is going to save [" + (writePosition) + "," + ((writePosition) + bytesLength) + ")");
             SeaweedWrite.writeData(entry, replication, filerGrpcClient, writePosition, bufferToWrite.array(), bufferToWrite.position(), bufferToWrite.limit());
             // System.out.println(path + " saved [" + (writePosition) + "," + ((writePosition) + bytesLength) + ")");
-            bufferToWrite.clear();
             ByteBufferPool.release(bufferToWrite);
             return null;
         });