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[BEAM-10212] Add caching state client wrapper (#15170)
* [BEAM-10212] Add caching state client wrapper.
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...java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
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/* | ||
* 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.beam.fn.harness.state; | ||
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import com.google.auto.value.AutoValue; | ||
import java.util.HashMap; | ||
import java.util.List; | ||
import java.util.Map; | ||
import java.util.concurrent.CompletableFuture; | ||
import org.apache.beam.model.fnexecution.v1.BeamFnApi; | ||
import org.apache.beam.model.fnexecution.v1.BeamFnApi.ProcessBundleRequest.CacheToken; | ||
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateGetResponse; | ||
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateKey; | ||
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateKey.IterableSideInput; | ||
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateKey.MultimapKeysSideInput; | ||
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateKey.MultimapSideInput; | ||
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateRequest; | ||
import org.apache.beam.model.fnexecution.v1.BeamFnApi.StateResponse; | ||
import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString; | ||
import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LoadingCache; | ||
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/** | ||
* Wraps a delegate BeamFnStateClient and stores the result of state requests in cross bundle cache | ||
* according to the available cache tokens. If there are no cache tokens for the state key requested | ||
* the request is forwarded to the client and executed normally. | ||
*/ | ||
public class CachingBeamFnStateClient implements BeamFnStateClient { | ||
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private final BeamFnStateClient beamFnStateClient; | ||
private final LoadingCache<StateKey, Map<StateCacheKey, StateGetResponse>> stateCache; | ||
private final Map<CacheToken.SideInput, ByteString> sideInputCacheTokens; | ||
private final ByteString userStateToken; | ||
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/** | ||
* Creates a CachingBeamFnStateClient that wraps a BeamFnStateClient with a LoadingCache. Cache | ||
* tokens are sent by the runner to indicate which state is able to be cached. | ||
*/ | ||
public CachingBeamFnStateClient( | ||
BeamFnStateClient beamFnStateClient, | ||
LoadingCache<StateKey, Map<StateCacheKey, StateGetResponse>> stateCache, | ||
List<CacheToken> cacheTokenList) { | ||
this.beamFnStateClient = beamFnStateClient; | ||
this.stateCache = stateCache; | ||
this.sideInputCacheTokens = new HashMap<>(); | ||
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// Set up cache tokens. | ||
ByteString tempUserStateToken = ByteString.EMPTY; | ||
for (BeamFnApi.ProcessBundleRequest.CacheToken token : cacheTokenList) { | ||
if (token.hasUserState()) { | ||
tempUserStateToken = token.getToken(); | ||
} else if (token.hasSideInput()) { | ||
sideInputCacheTokens.put(token.getSideInput(), token.getToken()); | ||
} | ||
} | ||
this.userStateToken = tempUserStateToken; | ||
} | ||
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/** | ||
* Completes the response with a cached value if possible, if not forwards the response to the | ||
* BeamFnStateClient and tries caching the result. All Append and Clear requests are forwarded. | ||
*/ | ||
@Override | ||
@SuppressWarnings("FutureReturnValueIgnored") | ||
public void handle( | ||
StateRequest.Builder requestBuilder, CompletableFuture<StateResponse> response) { | ||
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StateKey stateKey = requestBuilder.getStateKey(); | ||
ByteString cacheToken = getCacheToken(stateKey); | ||
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// If state is not cacheable proceed as normal. | ||
if (ByteString.EMPTY.equals(cacheToken)) { | ||
beamFnStateClient.handle(requestBuilder, response); | ||
return; | ||
} | ||
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switch (requestBuilder.getRequestCase()) { | ||
case GET: | ||
// Check if data is in the cache. | ||
StateCacheKey cacheKey = | ||
StateCacheKey.create(cacheToken, requestBuilder.getGet().getContinuationToken()); | ||
Map<StateCacheKey, StateGetResponse> stateKeyMap = stateCache.getUnchecked(stateKey); | ||
StateGetResponse cachedPage = stateKeyMap.get(cacheKey); | ||
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// If data is not cached, add callback to add response to cache on completion. | ||
// Otherwise, complete the response with the cached data. | ||
if (cachedPage == null) { | ||
response.thenAccept( | ||
stateResponse -> | ||
stateCache.getUnchecked(stateKey).put(cacheKey, stateResponse.getGet())); | ||
beamFnStateClient.handle(requestBuilder, response); | ||
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} else { | ||
response.complete( | ||
StateResponse.newBuilder().setId(requestBuilder.getId()).setGet(cachedPage).build()); | ||
} | ||
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return; | ||
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case APPEND: | ||
// TODO(BEAM-12637): Support APPEND in CachingBeamFnStateClient. | ||
beamFnStateClient.handle(requestBuilder, response); | ||
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// Invalidate last page of cached values (entry with a blank continuation token response) | ||
Map<StateCacheKey, StateGetResponse> map = stateCache.getUnchecked(stateKey); | ||
map.entrySet() | ||
.removeIf(entry -> (entry.getValue().getContinuationToken().equals(ByteString.EMPTY))); | ||
return; | ||
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case CLEAR: | ||
// Remove all state key data and replace with an empty response. | ||
beamFnStateClient.handle(requestBuilder, response); | ||
Map<StateCacheKey, StateGetResponse> clearedData = new HashMap<>(); | ||
StateCacheKey newKey = StateCacheKey.create(cacheToken, ByteString.EMPTY); | ||
clearedData.put(newKey, StateGetResponse.getDefaultInstance()); | ||
stateCache.put(stateKey, clearedData); | ||
return; | ||
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default: | ||
throw new IllegalStateException( | ||
String.format("Unknown request type %s", requestBuilder.getRequestCase())); | ||
} | ||
} | ||
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private ByteString getCacheToken(BeamFnApi.StateKey stateKey) { | ||
if (stateKey.hasBagUserState()) { | ||
return userStateToken; | ||
} else if (stateKey.hasRunner()) { | ||
// TODO(BEAM-12638): Support caching of remote references. | ||
return ByteString.EMPTY; | ||
} else { | ||
CacheToken.SideInput.Builder sideInputBuilder = CacheToken.SideInput.newBuilder(); | ||
if (stateKey.hasIterableSideInput()) { | ||
IterableSideInput iterableSideInput = stateKey.getIterableSideInput(); | ||
sideInputBuilder | ||
.setTransformId(iterableSideInput.getTransformId()) | ||
.setSideInputId(iterableSideInput.getSideInputId()); | ||
} else if (stateKey.hasMultimapSideInput()) { | ||
MultimapSideInput multimapSideInput = stateKey.getMultimapSideInput(); | ||
sideInputBuilder | ||
.setTransformId(multimapSideInput.getTransformId()) | ||
.setSideInputId(multimapSideInput.getSideInputId()); | ||
} else if (stateKey.hasMultimapKeysSideInput()) { | ||
MultimapKeysSideInput multimapKeysSideInput = stateKey.getMultimapKeysSideInput(); | ||
sideInputBuilder | ||
.setTransformId(multimapKeysSideInput.getTransformId()) | ||
.setSideInputId(multimapKeysSideInput.getSideInputId()); | ||
} | ||
return sideInputCacheTokens.getOrDefault(sideInputBuilder.build(), ByteString.EMPTY); | ||
} | ||
} | ||
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/** A key for caching the result of a StateGetRequest by cache and continuation tokens. */ | ||
@AutoValue | ||
public abstract static class StateCacheKey { | ||
public abstract ByteString getCacheToken(); | ||
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public abstract ByteString getContinuationToken(); | ||
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static StateCacheKey create(ByteString cacheToken, ByteString continuationToken) { | ||
return new AutoValue_CachingBeamFnStateClient_StateCacheKey(cacheToken, continuationToken); | ||
} | ||
} | ||
} |
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