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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2021/07/14 21:30:36 UTC
[GitHub] [beam] lukecwik commented on a change in pull request #15170: [BEAM-10212] Add caching state client wrapper
lukecwik commented on a change in pull request #15170:
URL: https://github.com/apache/beam/pull/15170#discussion_r669936810
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
+
+ private final BeamFnStateClient beamFnStateClient;
+ private final Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache;
+ private Map<Pair<String, String>, ByteString> sideInputCacheTokens;
Review comment:
I would suggest using an `@AutoValue` around a simple struct like class instead of a `Pair` for readability and code comprehension if it becomes necessary.
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
+
+ private final BeamFnStateClient beamFnStateClient;
+ private final Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache;
+ private Map<Pair<String, String>, ByteString> sideInputCacheTokens;
+ private ByteString userStateToken;
+
+ public CachingBeamFnStateClient(
+ BeamFnStateClient beamFnStateClient,
+ Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache,
+ List<CacheToken> cacheTokenList) {
+ this.beamFnStateClient = beamFnStateClient;
+ this.stateCache = stateCache;
+ this.sideInputCacheTokens = new HashMap<>();
+ this.userStateToken = null;
+
+ // Set up cache tokens
+ for (BeamFnApi.ProcessBundleRequest.CacheToken token : cacheTokenList) {
+ if (token.hasUserState()) {
+ this.userStateToken = token.getToken();
Review comment:
You typically have to use a local variable first to "find" the value and then assign it to the final member variable to get around it being "final" in a for loop.
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
+
+ private final BeamFnStateClient beamFnStateClient;
+ private final Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache;
+ private Map<Pair<String, String>, ByteString> sideInputCacheTokens;
+ private ByteString userStateToken;
+
+ public CachingBeamFnStateClient(
+ BeamFnStateClient beamFnStateClient,
+ Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache,
+ List<CacheToken> cacheTokenList) {
+ this.beamFnStateClient = beamFnStateClient;
+ this.stateCache = stateCache;
+ this.sideInputCacheTokens = new HashMap<>();
+ this.userStateToken = null;
+
+ // Set up cache tokens
+ for (BeamFnApi.ProcessBundleRequest.CacheToken token : cacheTokenList) {
+ if (token.hasUserState()) {
+ this.userStateToken = token.getToken();
+ } else if (token.hasSideInput()) {
+ Pair<String, String> sideInput =
+ new ImmutablePair<>(
+ token.getSideInput().getTransformId(), token.getSideInput().getSideInputId());
+ sideInputCacheTokens.put(sideInput, token.getToken());
+ }
+ }
+ }
+
+ @Override
+ public void handle(
+ BeamFnApi.StateRequest.Builder requestBuilder,
+ CompletableFuture<BeamFnApi.StateResponse> response) {
+
+ StateRequest request = requestBuilder.build();
+ StateKey stateKey = request.getStateKey();
+ ByteString cacheToken = getCacheToken(stateKey);
+ StateResponse.Builder responseBuilder = StateResponse.newBuilder();
+
+ // If not cacheable proceed as normal
+ if (cacheToken == null) {
+ beamFnStateClient.handle(requestBuilder, response);
+ return;
+ }
+
+ // Check if data is in the cache already
+ StateGetResponse cachedFirstPage = null;
+ Pair<StateKey, ByteString> cacheKey = new ImmutablePair<>(stateKey, cacheToken);
+ cachedFirstPage = stateCache.getIfPresent(cacheKey);
+
+ switch (request.getRequestCase()) {
+ case GET:
+ if (ByteString.EMPTY.equals(request.getGet().getContinuationToken())) {
+ if (cachedFirstPage == null) {
+ beamFnStateClient.handle(requestBuilder, response);
+ try {
+ stateCache.put(cacheKey, response.get().getGet());
+ } catch (Exception e) {
+ // response should already be completed exceptionally
+ return;
+ }
+ } else {
+ response.complete(
+ responseBuilder.setId(requestBuilder.getId()).setGet(cachedFirstPage).build());
+ }
+ } else {
+ beamFnStateClient.handle(requestBuilder, response);
+ }
+
+ return;
+
+ case APPEND:
+ if (cachedFirstPage == null) {
+ CompletableFuture<StateResponse> responseFuture = new CompletableFuture<>();
+ beamFnStateClient.handle(
+ StateRequest.newBuilder()
Review comment:
Until we get the rest working, let us treat APPEND as a cache eviction instead. Handling APPEND is more complicated since we want to merge existing data with the new data without needing to have a "get" call and there are a couple of scenarios (e.g., there is no existing data, the last page is still cached, ...).
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
+
+ private final BeamFnStateClient beamFnStateClient;
+ private final Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache;
+ private Map<Pair<String, String>, ByteString> sideInputCacheTokens;
+ private ByteString userStateToken;
+
+ public CachingBeamFnStateClient(
+ BeamFnStateClient beamFnStateClient,
+ Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache,
+ List<CacheToken> cacheTokenList) {
+ this.beamFnStateClient = beamFnStateClient;
+ this.stateCache = stateCache;
+ this.sideInputCacheTokens = new HashMap<>();
+ this.userStateToken = null;
+
+ // Set up cache tokens
+ for (BeamFnApi.ProcessBundleRequest.CacheToken token : cacheTokenList) {
+ if (token.hasUserState()) {
+ this.userStateToken = token.getToken();
+ } else if (token.hasSideInput()) {
+ Pair<String, String> sideInput =
+ new ImmutablePair<>(
+ token.getSideInput().getTransformId(), token.getSideInput().getSideInputId());
+ sideInputCacheTokens.put(sideInput, token.getToken());
+ }
+ }
+ }
+
+ @Override
+ public void handle(
+ BeamFnApi.StateRequest.Builder requestBuilder,
+ CompletableFuture<BeamFnApi.StateResponse> response) {
+
+ StateRequest request = requestBuilder.build();
+ StateKey stateKey = request.getStateKey();
+ ByteString cacheToken = getCacheToken(stateKey);
+ StateResponse.Builder responseBuilder = StateResponse.newBuilder();
+
+ // If not cacheable proceed as normal
+ if (cacheToken == null) {
+ beamFnStateClient.handle(requestBuilder, response);
+ return;
+ }
+
+ // Check if data is in the cache already
+ StateGetResponse cachedFirstPage = null;
+ Pair<StateKey, ByteString> cacheKey = new ImmutablePair<>(stateKey, cacheToken);
+ cachedFirstPage = stateCache.getIfPresent(cacheKey);
+
+ switch (request.getRequestCase()) {
+ case GET:
+ if (ByteString.EMPTY.equals(request.getGet().getContinuationToken())) {
+ if (cachedFirstPage == null) {
+ beamFnStateClient.handle(requestBuilder, response);
+ try {
+ stateCache.put(cacheKey, response.get().getGet());
Review comment:
You don't want to resolve the future here as this will make all calls block. You want to add a completion stage to the future so when it is done it will populate the cache.
This will also remove the try/catch block since you can make the completion stage only execute on success.
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
Review comment:
class comment
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
+
+ private final BeamFnStateClient beamFnStateClient;
+ private final Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache;
+ private Map<Pair<String, String>, ByteString> sideInputCacheTokens;
+ private ByteString userStateToken;
+
+ public CachingBeamFnStateClient(
+ BeamFnStateClient beamFnStateClient,
+ Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache,
+ List<CacheToken> cacheTokenList) {
+ this.beamFnStateClient = beamFnStateClient;
+ this.stateCache = stateCache;
+ this.sideInputCacheTokens = new HashMap<>();
+ this.userStateToken = null;
+
+ // Set up cache tokens
+ for (BeamFnApi.ProcessBundleRequest.CacheToken token : cacheTokenList) {
+ if (token.hasUserState()) {
+ this.userStateToken = token.getToken();
+ } else if (token.hasSideInput()) {
+ Pair<String, String> sideInput =
+ new ImmutablePair<>(
+ token.getSideInput().getTransformId(), token.getSideInput().getSideInputId());
+ sideInputCacheTokens.put(sideInput, token.getToken());
+ }
+ }
+ }
+
+ @Override
+ public void handle(
+ BeamFnApi.StateRequest.Builder requestBuilder,
+ CompletableFuture<BeamFnApi.StateResponse> response) {
+
+ StateRequest request = requestBuilder.build();
+ StateKey stateKey = request.getStateKey();
+ ByteString cacheToken = getCacheToken(stateKey);
+ StateResponse.Builder responseBuilder = StateResponse.newBuilder();
+
+ // If not cacheable proceed as normal
+ if (cacheToken == null) {
+ beamFnStateClient.handle(requestBuilder, response);
+ return;
+ }
+
+ // Check if data is in the cache already
+ StateGetResponse cachedFirstPage = null;
Review comment:
As a follow-up after this feature is working, consider using a LoadingCache so that multiple requests for the same statekey will all resolve to the same CompletableFuture and/or cache value.
Add a comment to that effect for now.
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
+
+ private final BeamFnStateClient beamFnStateClient;
+ private final Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache;
+ private Map<Pair<String, String>, ByteString> sideInputCacheTokens;
+ private ByteString userStateToken;
+
+ public CachingBeamFnStateClient(
+ BeamFnStateClient beamFnStateClient,
+ Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache,
+ List<CacheToken> cacheTokenList) {
+ this.beamFnStateClient = beamFnStateClient;
+ this.stateCache = stateCache;
+ this.sideInputCacheTokens = new HashMap<>();
+ this.userStateToken = null;
+
+ // Set up cache tokens
+ for (BeamFnApi.ProcessBundleRequest.CacheToken token : cacheTokenList) {
+ if (token.hasUserState()) {
+ this.userStateToken = token.getToken();
+ } else if (token.hasSideInput()) {
+ Pair<String, String> sideInput =
+ new ImmutablePair<>(
+ token.getSideInput().getTransformId(), token.getSideInput().getSideInputId());
+ sideInputCacheTokens.put(sideInput, token.getToken());
+ }
+ }
+ }
+
+ @Override
+ public void handle(
+ BeamFnApi.StateRequest.Builder requestBuilder,
+ CompletableFuture<BeamFnApi.StateResponse> response) {
+
+ StateRequest request = requestBuilder.build();
+ StateKey stateKey = request.getStateKey();
+ ByteString cacheToken = getCacheToken(stateKey);
+ StateResponse.Builder responseBuilder = StateResponse.newBuilder();
+
+ // If not cacheable proceed as normal
+ if (cacheToken == null) {
+ beamFnStateClient.handle(requestBuilder, response);
+ return;
+ }
+
+ // Check if data is in the cache already
+ StateGetResponse cachedFirstPage = null;
+ Pair<StateKey, ByteString> cacheKey = new ImmutablePair<>(stateKey, cacheToken);
+ cachedFirstPage = stateCache.getIfPresent(cacheKey);
+
+ switch (request.getRequestCase()) {
+ case GET:
+ if (ByteString.EMPTY.equals(request.getGet().getContinuationToken())) {
+ if (cachedFirstPage == null) {
+ beamFnStateClient.handle(requestBuilder, response);
+ try {
+ stateCache.put(cacheKey, response.get().getGet());
+ } catch (Exception e) {
+ // response should already be completed exceptionally
+ return;
+ }
+ } else {
+ response.complete(
+ responseBuilder.setId(requestBuilder.getId()).setGet(cachedFirstPage).build());
+ }
+ } else {
+ beamFnStateClient.handle(requestBuilder, response);
+ }
+
+ return;
+
+ case APPEND:
+ if (cachedFirstPage == null) {
+ CompletableFuture<StateResponse> responseFuture = new CompletableFuture<>();
+ beamFnStateClient.handle(
+ StateRequest.newBuilder()
+ .setStateKey(stateKey)
+ .setGet(StateGetRequest.getDefaultInstance()),
+ responseFuture);
+ try {
+ cachedFirstPage = responseFuture.get().getGet();
+ stateCache.put(cacheKey, cachedFirstPage);
+ } catch (Exception e) {
+ // If we can't cache the value just send append as before
+ beamFnStateClient.handle(requestBuilder, response);
+ return;
+ }
+ }
+
+ if (ByteString.EMPTY.equals(cachedFirstPage.getContinuationToken())) {
+ cachedFirstPage =
+ StateGetResponse.newBuilder()
+ .setData(cachedFirstPage.getData().concat(requestBuilder.getAppend().getData()))
+ .setContinuationToken(ByteString.EMPTY)
+ .build();
+ stateCache.put(cacheKey, cachedFirstPage);
+ }
+
+ beamFnStateClient.handle(requestBuilder, response);
+ return;
+
+ case CLEAR:
+ stateCache.put(cacheKey, StateGetResponse.getDefaultInstance());
Review comment:
Wouldn't you want to remove all values associated with the `StateKey` and insert the default using the first page which is represented as `""`. You might want to have a two level map `StateKey -> Cache Token (ByteString) -> Data`
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
+
+ private final BeamFnStateClient beamFnStateClient;
+ private final Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache;
+ private Map<Pair<String, String>, ByteString> sideInputCacheTokens;
+ private ByteString userStateToken;
+
+ public CachingBeamFnStateClient(
+ BeamFnStateClient beamFnStateClient,
+ Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache,
+ List<CacheToken> cacheTokenList) {
+ this.beamFnStateClient = beamFnStateClient;
+ this.stateCache = stateCache;
+ this.sideInputCacheTokens = new HashMap<>();
+ this.userStateToken = null;
+
+ // Set up cache tokens
+ for (BeamFnApi.ProcessBundleRequest.CacheToken token : cacheTokenList) {
+ if (token.hasUserState()) {
+ this.userStateToken = token.getToken();
+ } else if (token.hasSideInput()) {
+ Pair<String, String> sideInput =
+ new ImmutablePair<>(
+ token.getSideInput().getTransformId(), token.getSideInput().getSideInputId());
+ sideInputCacheTokens.put(sideInput, token.getToken());
+ }
+ }
+ }
+
+ @Override
+ public void handle(
+ BeamFnApi.StateRequest.Builder requestBuilder,
+ CompletableFuture<BeamFnApi.StateResponse> response) {
+
+ StateRequest request = requestBuilder.build();
+ StateKey stateKey = request.getStateKey();
+ ByteString cacheToken = getCacheToken(stateKey);
+ StateResponse.Builder responseBuilder = StateResponse.newBuilder();
+
+ // If not cacheable proceed as normal
+ if (cacheToken == null) {
+ beamFnStateClient.handle(requestBuilder, response);
+ return;
+ }
+
+ // Check if data is in the cache already
+ StateGetResponse cachedFirstPage = null;
+ Pair<StateKey, ByteString> cacheKey = new ImmutablePair<>(stateKey, cacheToken);
+ cachedFirstPage = stateCache.getIfPresent(cacheKey);
Review comment:
`cachedFirstPage` here is misnomer, it is just `cachedPage`
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
+
+ private final BeamFnStateClient beamFnStateClient;
+ private final Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache;
+ private Map<Pair<String, String>, ByteString> sideInputCacheTokens;
+ private ByteString userStateToken;
Review comment:
```suggestion
private final Map<Pair<String, String>, ByteString> sideInputCacheTokens;
private final ByteString userStateToken;
```
##########
File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/state/CachingBeamFnStateClient.java
##########
@@ -0,0 +1,179 @@
+/*
+ * 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;
+
+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.StateGetRequest;
+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.repackaged.core.org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.beam.repackaged.core.org.apache.commons.lang3.tuple.Pair;
+import org.apache.beam.vendor.grpc.v1p36p0.com.google.protobuf.ByteString;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.Cache;
+
+public class CachingBeamFnStateClient implements BeamFnStateClient {
+
+ private final BeamFnStateClient beamFnStateClient;
+ private final Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache;
+ private Map<Pair<String, String>, ByteString> sideInputCacheTokens;
+ private ByteString userStateToken;
+
+ public CachingBeamFnStateClient(
+ BeamFnStateClient beamFnStateClient,
+ Cache<Pair<StateKey, ByteString>, StateGetResponse> stateCache,
+ List<CacheToken> cacheTokenList) {
+ this.beamFnStateClient = beamFnStateClient;
+ this.stateCache = stateCache;
+ this.sideInputCacheTokens = new HashMap<>();
+ this.userStateToken = null;
+
+ // Set up cache tokens
+ for (BeamFnApi.ProcessBundleRequest.CacheToken token : cacheTokenList) {
+ if (token.hasUserState()) {
+ this.userStateToken = token.getToken();
+ } else if (token.hasSideInput()) {
+ Pair<String, String> sideInput =
+ new ImmutablePair<>(
+ token.getSideInput().getTransformId(), token.getSideInput().getSideInputId());
+ sideInputCacheTokens.put(sideInput, token.getToken());
+ }
+ }
+ }
+
+ @Override
+ public void handle(
+ BeamFnApi.StateRequest.Builder requestBuilder,
+ CompletableFuture<BeamFnApi.StateResponse> response) {
+
+ StateRequest request = requestBuilder.build();
+ StateKey stateKey = request.getStateKey();
+ ByteString cacheToken = getCacheToken(stateKey);
+ StateResponse.Builder responseBuilder = StateResponse.newBuilder();
+
+ // If not cacheable proceed as normal
+ if (cacheToken == null) {
+ beamFnStateClient.handle(requestBuilder, response);
+ return;
+ }
+
+ // Check if data is in the cache already
+ StateGetResponse cachedFirstPage = null;
+ Pair<StateKey, ByteString> cacheKey = new ImmutablePair<>(stateKey, cacheToken);
+ cachedFirstPage = stateCache.getIfPresent(cacheKey);
+
+ switch (request.getRequestCase()) {
+ case GET:
+ if (ByteString.EMPTY.equals(request.getGet().getContinuationToken())) {
Review comment:
This looks like we are only ever caching the first page and subsequent ones aren't handled.
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