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Add manifest caching to iceberg connector
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presto-iceberg/src/main/java/com/facebook/presto/iceberg/HdfsCachedInputFile.java
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|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /* | ||
| * Licensed 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 com.facebook.presto.iceberg; | ||
|
|
||
| import com.facebook.airlift.log.Logger; | ||
| import org.apache.iceberg.io.ByteBufferInputStream; | ||
| import org.apache.iceberg.io.IOUtil; | ||
| import org.apache.iceberg.io.InputFile; | ||
| import org.apache.iceberg.io.SeekableInputStream; | ||
|
|
||
| import java.io.IOException; | ||
| import java.nio.ByteBuffer; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
|
|
||
| public class HdfsCachedInputFile | ||
| implements InputFile | ||
| { | ||
| private static final Logger LOG = Logger.get(HdfsCachedInputFile.class); | ||
| private static final long BUFFER_CHUNK_SIZE = 2 * 1024 * 1024; | ||
|
|
||
| private final InputFile delegate; | ||
| private final ManifestFileCacheKey cacheKey; | ||
| private final ManifestFileCache cache; | ||
|
|
||
| public HdfsCachedInputFile(InputFile delegate, ManifestFileCacheKey cacheKey, ManifestFileCache cache) | ||
| { | ||
| this.delegate = delegate; | ||
| this.cacheKey = cacheKey; | ||
| this.cache = cache; | ||
| } | ||
|
|
||
| @Override | ||
| public long getLength() | ||
| { | ||
| ManifestFileCachedContent cachedContent = cache.getIfPresent(cacheKey); | ||
| if (cachedContent != null) { | ||
| return cachedContent.getLength(); | ||
| } | ||
| return delegate.getLength(); | ||
| } | ||
|
|
||
| @Override | ||
| public SeekableInputStream newStream() | ||
| { | ||
| ManifestFileCachedContent cachedContent = cache.getIfPresent(cacheKey); | ||
| if (cachedContent != null) { | ||
| return ByteBufferInputStream.wrap(cachedContent.getData()); | ||
| } | ||
|
|
||
| if (delegate.getLength() <= cache.getMaxFileLength() && cache.isEnabled()) { | ||
| try { | ||
| ManifestFileCachedContent content = downloadManifest(delegate); | ||
| cache.put(cacheKey, content); | ||
| cache.recordFileSize(content.getLength()); | ||
| return ByteBufferInputStream.wrap(content.getData()); | ||
| } | ||
| catch (IOException e) { | ||
| LOG.warn("Failed to cache input file. Falling back to direct read.", e); | ||
| } | ||
| } | ||
|
|
||
| return delegate.newStream(); | ||
| } | ||
|
|
||
| @Override | ||
| public String location() | ||
| { | ||
| return delegate.location(); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean exists() | ||
| { | ||
| return false; | ||
| } | ||
|
|
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| private static ManifestFileCachedContent downloadManifest(InputFile input) | ||
| throws IOException | ||
| { | ||
| try (SeekableInputStream stream = input.newStream()) { | ||
| long fileLength = input.getLength(); | ||
| long totalBytesToRead = fileLength; | ||
| List<ByteBuffer> buffers = new ArrayList<>(((int) (fileLength / BUFFER_CHUNK_SIZE)) + (fileLength % BUFFER_CHUNK_SIZE == 0 ? 0 : 1)); | ||
|
|
||
| while (totalBytesToRead > 0) { | ||
| int bytesToRead = (int) Math.min(BUFFER_CHUNK_SIZE, totalBytesToRead); | ||
| byte[] buf = new byte[bytesToRead]; | ||
| int bytesRead = IOUtil.readRemaining(stream, buf, 0, bytesToRead); | ||
| totalBytesToRead -= bytesRead; | ||
|
|
||
| if (bytesRead < bytesToRead) { | ||
| throw new IOException( | ||
| String.format( | ||
| "Failed to read %d bytes: %d bytes in stream", | ||
| fileLength, fileLength - totalBytesToRead)); | ||
| } | ||
| else { | ||
| buffers.add(ByteBuffer.wrap(buf)); | ||
| } | ||
| } | ||
| return new ManifestFileCachedContent(buffers, fileLength); | ||
| } | ||
| } | ||
| } |
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