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Merge pull request #225 from aiven/ivanyu/segment-metadata-cache
Add segment manifest cache
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commons/src/main/java/io/aiven/kafka/tieredstorage/commons/SegmentManifestProvider.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /* | ||
| * Copyright 2023 Aiven Oy | ||
| * | ||
| * 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. | ||
| */ | ||
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|
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| package io.aiven.kafka.tieredstorage.commons; | ||
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.time.Duration; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.CompletionException; | ||
| import java.util.concurrent.ExecutionException; | ||
| import java.util.concurrent.Executor; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.TimeoutException; | ||
| import java.util.function.Supplier; | ||
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| import org.apache.kafka.server.log.remote.storage.RemoteLogSegmentMetadata; | ||
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| import io.aiven.kafka.tieredstorage.commons.manifest.SegmentManifest; | ||
| import io.aiven.kafka.tieredstorage.commons.storage.FileFetcher; | ||
| import io.aiven.kafka.tieredstorage.commons.storage.StorageBackEndException; | ||
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| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.github.benmanes.caffeine.cache.AsyncCacheLoader; | ||
| import com.github.benmanes.caffeine.cache.AsyncLoadingCache; | ||
| import com.github.benmanes.caffeine.cache.Caffeine; | ||
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| class SegmentManifestProvider { | ||
| private static final long GET_TIMEOUT_SEC = 10; | ||
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| private final ObjectKey objectKey; | ||
| private final AsyncLoadingCache<String, SegmentManifest> cache; | ||
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| /** | ||
| * @param maxCacheSize the max cache size (in items) or empty if the cache is unbounded. | ||
| * @param cacheRetention the retention time of items in the cache or empty if infinite retention. | ||
| */ | ||
| SegmentManifestProvider(final ObjectKey objectKey, | ||
| final Optional<Long> maxCacheSize, | ||
| final Optional<Duration> cacheRetention, | ||
| final FileFetcher fileFetcher, | ||
| final ObjectMapper mapper, | ||
| final Executor executor) { | ||
| this.objectKey = objectKey; | ||
| final var cacheBuilder = Caffeine.newBuilder() | ||
| .executor(executor); | ||
| maxCacheSize.ifPresent(cacheBuilder::maximumSize); | ||
| cacheRetention.ifPresent(cacheBuilder::expireAfterWrite); | ||
| this.cache = cacheBuilder.buildAsync(new Loader(fileFetcher, mapper)); | ||
| } | ||
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| private static class Loader implements AsyncCacheLoader<String, SegmentManifest> { | ||
| private final FileFetcher fileFetcher; | ||
| private final ObjectMapper mapper; | ||
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| private Loader(final FileFetcher fileFetcher, final ObjectMapper mapper) { | ||
| this.fileFetcher = fileFetcher; | ||
| this.mapper = mapper; | ||
| } | ||
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| @Override | ||
| public CompletableFuture<? extends SegmentManifest> asyncLoad( | ||
| final String key, final Executor executor) throws Exception { | ||
| final Supplier<SegmentManifest> fetcher = () -> { | ||
| try (final InputStream is = fileFetcher.fetch(key)) { | ||
| return mapper.readValue(is, SegmentManifest.class); | ||
| } catch (final StorageBackEndException | IOException e) { | ||
| // Wrap these exceptions to unwrap them later. | ||
| throw new CompletionException(e); | ||
| } | ||
| }; | ||
| return CompletableFuture.supplyAsync(fetcher, executor); | ||
| } | ||
| } | ||
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| SegmentManifest get(final RemoteLogSegmentMetadata remoteLogSegmentMetadata) | ||
| throws StorageBackEndException, IOException { | ||
| final String key = objectKey.key(remoteLogSegmentMetadata, ObjectKey.Suffix.MANIFEST); | ||
| try { | ||
| return cache.get(key).get(GET_TIMEOUT_SEC, TimeUnit.SECONDS); | ||
| } catch (final ExecutionException e) { | ||
| // Unwrap previously wrapped exceptions if possible. | ||
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| final Throwable cause = e.getCause(); | ||
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| // We don't really expect this case, but handle it nevertheless. | ||
| if (cause == null) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| if (e.getCause() instanceof StorageBackEndException) { | ||
| throw (StorageBackEndException) e.getCause(); | ||
| } | ||
| if (e.getCause() instanceof IOException) { | ||
| throw (IOException) e.getCause(); | ||
| } | ||
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| throw new RuntimeException(e); | ||
| } catch (final InterruptedException | TimeoutException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
| } |
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