[WIP][core] Introduce AsyncPositionOutputStream

paimon-common/src/main/java/org/apache/paimon/fs/AsyncPositionOutputStream.java

@@ -0,0 +1,168 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.paimon.fs;
+
+import java.io.IOException;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.apache.paimon.utils.ThreadUtils.newDaemonThreadFactory;
+
+/** A {@link PositionOutputStream} which uses a async thread to write data. */
+public class AsyncPositionOutputStream extends PositionOutputStream {
+
+    public static final ExecutorService EXECUTOR_SERVICE =
+            Executors.newCachedThreadPool(newDaemonThreadFactory("AsyncOutputStream"));
+
+    private final PositionOutputStream out;
+    private final LinkedBlockingQueue<AsyncEvent> eventQueue;
+    private final AtomicReference<Throwable> exception;
+    private final Future<?> future;
+
+    private volatile boolean isClosed;
+    private long position;
+
+    public AsyncPositionOutputStream(PositionOutputStream out) {
+        this.out = out;
+        this.eventQueue = new LinkedBlockingQueue<>();
+        this.exception = new AtomicReference<>();
+        this.isClosed = false;
+        this.position = 0;
+        this.future = EXECUTOR_SERVICE.submit(this::execute);
+    }
+
+    private void execute() {
+        try {
+            doWork();
+        } catch (Throwable e) {
+            exception.set(e);
+            throw new RuntimeException(e);
+        }
+    }
+
+    private void doWork() throws InterruptedException, IOException {
+        try {
+            while (!isClosed) {
+                AsyncEvent event = eventQueue.poll(1, TimeUnit.SECONDS);
+                if (event == null) {
+                    continue;
+                }
+                if (event instanceof EndEvent) {
+                    return;
+                }
+                if (event instanceof DataEvent) {
+                    DataEvent dataEvent = (DataEvent) event;
+                    out.write(dataEvent.data);
+                }
+                if (event instanceof FlushEvent) {
+                    out.flush();
+                }
+            }
+        } finally {
+            out.close();
+        }
+    }
+
+    @Override
+    public long getPos() throws IOException {
+        checkException();
+        return position;
+    }
+
+    @Override
+    public void write(int b) throws IOException {
+        checkException();
+        position++;
+        putEvent(new DataEvent(new byte[] {(byte) b}, 0, 1));
+    }
+
+    @Override
+    public void write(byte[] b) throws IOException {
+        checkException();
+        position += b.length;
+        putEvent(new DataEvent(b, 0, b.length));
+    }
+
+    @Override
+    public void write(byte[] b, int off, int len) throws IOException {
+        checkException();
+        position += len;
+        putEvent(new DataEvent(b, off, len));
+    }
+
+    @Override
+    public void flush() throws IOException {
+        checkException();
+        putEvent(new FlushEvent());
+    }
+
+    @Override
+    public void close() throws IOException {
+        checkException();
+        putEvent(new EndEvent());
+        try {
+            this.future.get();
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new RuntimeException(e);
+        } catch (ExecutionException e) {
+            throw new RuntimeException(e);
+        } finally {
+            isClosed = true;
+        }
+    }
+
+    private void putEvent(AsyncEvent event) {
+        try {
+            eventQueue.put(event);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new RuntimeException(e);
+        }
+    }
+
+    private void checkException() throws IOException {
+        Throwable throwable = exception.get();
+        if (throwable != null) {
+            throw new IOException(throwable);
+        }
+    }
+
+    private interface AsyncEvent {}
+
+    private static class DataEvent implements AsyncEvent {
+
+        private final byte[] data;
+
+        public DataEvent(byte[] input, int offset, int length) {
+            byte[] data = new byte[length];
+            System.arraycopy(input, offset, data, 0, length);
+            this.data = data;
+        }
+    }
+
+    private static class FlushEvent implements AsyncEvent {}
+
+    private static class EndEvent implements AsyncEvent {}
+}

paimon-core/src/main/java/org/apache/paimon/io/SingleFileWriter.java

@@ -21,6 +21,7 @@
 import org.apache.paimon.data.InternalRow;
 import org.apache.paimon.format.FormatWriter;
 import org.apache.paimon.format.FormatWriterFactory;
+import org.apache.paimon.fs.AsyncPositionOutputStream;
 import org.apache.paimon.fs.FileIO;
 import org.apache.paimon.fs.Path;
 import org.apache.paimon.fs.PositionOutputStream;
@@ -64,7 +65,7 @@ public SingleFileWriter(
         this.converter = converter;
 
         try {
-            out = fileIO.newOutputStream(path, false);
+            out = new AsyncPositionOutputStream(fileIO.newOutputStream(path, false));
             writer = factory.create(out, compression);
         } catch (IOException e) {
             LOG.warn(