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Bigtable: add await replication (googleapis#3658)
This replaces the raw calls to generate/check consistancy token with a polling wrapper that wait until all clusters are consistent.
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54 changes: 0 additions & 54 deletions
54
...table-admin/src/main/java/com/google/cloud/bigtable/admin/v2/models/ConsistencyToken.java
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...admin/src/main/java/com/google/cloud/bigtable/admin/v2/stub/AwaitReplicationCallable.java
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| /* | ||
| * Copyright 2018 Google LLC | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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.google.cloud.bigtable.admin.v2.stub; | ||
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|
||
| import com.google.api.core.ApiAsyncFunction; | ||
| import com.google.api.core.ApiFunction; | ||
| import com.google.api.core.ApiFuture; | ||
| import com.google.api.core.ApiFutures; | ||
| import com.google.api.gax.retrying.ExponentialPollAlgorithm; | ||
| import com.google.api.gax.retrying.NonCancellableFuture; | ||
| import com.google.api.gax.retrying.ResultRetryAlgorithm; | ||
| import com.google.api.gax.retrying.RetryAlgorithm; | ||
| import com.google.api.gax.retrying.RetrySettings; | ||
| import com.google.api.gax.retrying.RetryingExecutor; | ||
| import com.google.api.gax.retrying.RetryingFuture; | ||
| import com.google.api.gax.retrying.ScheduledRetryingExecutor; | ||
| import com.google.api.gax.retrying.TimedAttemptSettings; | ||
| import com.google.api.gax.rpc.ApiCallContext; | ||
| import com.google.api.gax.rpc.ClientContext; | ||
| import com.google.api.gax.rpc.UnaryCallable; | ||
| import com.google.bigtable.admin.v2.CheckConsistencyRequest; | ||
| import com.google.bigtable.admin.v2.CheckConsistencyResponse; | ||
| import com.google.bigtable.admin.v2.GenerateConsistencyTokenRequest; | ||
| import com.google.bigtable.admin.v2.GenerateConsistencyTokenResponse; | ||
| import com.google.bigtable.admin.v2.TableName; | ||
| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.common.util.concurrent.MoreExecutors; | ||
| import java.util.concurrent.Callable; | ||
| import java.util.concurrent.CancellationException; | ||
|
|
||
| /** | ||
| * Callable that waits until replication has caught up to the point it was called. | ||
| * | ||
| * <p>This callable wraps GenerateConsistencyToken and CheckConsistency RPCs. It will generate a | ||
| * token then poll until isConsistent is true. | ||
| */ | ||
| class AwaitReplicationCallable extends UnaryCallable<TableName, Void> { | ||
| private final UnaryCallable<GenerateConsistencyTokenRequest, GenerateConsistencyTokenResponse> generateCallable; | ||
| private final UnaryCallable<CheckConsistencyRequest, CheckConsistencyResponse> checkCallable; | ||
| private final RetryingExecutor<CheckConsistencyResponse> executor; | ||
|
|
||
| static AwaitReplicationCallable create( | ||
| UnaryCallable<GenerateConsistencyTokenRequest, GenerateConsistencyTokenResponse> generateCallable, | ||
| UnaryCallable<CheckConsistencyRequest, CheckConsistencyResponse> checkCallable, | ||
| ClientContext clientContext, | ||
| RetrySettings pollingSettings) { | ||
|
|
||
| RetryAlgorithm<CheckConsistencyResponse> retryAlgorithm = new RetryAlgorithm<>( | ||
| new PollResultAlgorithm(), | ||
| new ExponentialPollAlgorithm(pollingSettings, clientContext.getClock()) | ||
| ); | ||
|
|
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| RetryingExecutor<CheckConsistencyResponse> retryingExecutor = new ScheduledRetryingExecutor<>( | ||
| retryAlgorithm, | ||
| clientContext.getExecutor() | ||
| ); | ||
|
|
||
| return new AwaitReplicationCallable( | ||
| generateCallable, | ||
| checkCallable, | ||
| retryingExecutor | ||
| ); | ||
| } | ||
|
|
||
| @VisibleForTesting | ||
| AwaitReplicationCallable( | ||
| UnaryCallable<GenerateConsistencyTokenRequest, GenerateConsistencyTokenResponse> generateCallable, | ||
| UnaryCallable<CheckConsistencyRequest, CheckConsistencyResponse> checkCallable, | ||
| RetryingExecutor<CheckConsistencyResponse> executor) { | ||
| this.generateCallable = generateCallable; | ||
| this.checkCallable = checkCallable; | ||
| this.executor = executor; | ||
| } | ||
|
|
||
| @Override | ||
| public ApiFuture<Void> futureCall(final TableName tableName, final ApiCallContext context) { | ||
| ApiFuture<GenerateConsistencyTokenResponse> tokenFuture = generateToken(tableName, context); | ||
|
|
||
| return ApiFutures.transformAsync( | ||
| tokenFuture, | ||
| new ApiAsyncFunction<GenerateConsistencyTokenResponse, Void>() { | ||
| @Override | ||
| public ApiFuture<Void> apply(GenerateConsistencyTokenResponse input) { | ||
| CheckConsistencyRequest request = CheckConsistencyRequest.newBuilder() | ||
| .setName(tableName.toString()) | ||
| .setConsistencyToken(input.getConsistencyToken()) | ||
| .build(); | ||
|
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| return pollToken(request, context); | ||
| } | ||
| }, | ||
| MoreExecutors.directExecutor() | ||
| ); | ||
| } | ||
|
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| private ApiFuture<GenerateConsistencyTokenResponse> generateToken(TableName tableName, | ||
| ApiCallContext context) { | ||
| GenerateConsistencyTokenRequest generateRequest = GenerateConsistencyTokenRequest.newBuilder() | ||
| .setName(tableName.toString()) | ||
| .build(); | ||
| return generateCallable.futureCall(generateRequest, context); | ||
| } | ||
|
|
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| private ApiFuture<Void> pollToken(CheckConsistencyRequest request, ApiCallContext context) { | ||
| AttemptCallable<CheckConsistencyRequest, CheckConsistencyResponse> attemptCallable = | ||
| new AttemptCallable<>(checkCallable, request, context); | ||
| RetryingFuture<CheckConsistencyResponse> retryingFuture = executor | ||
| .createFuture(attemptCallable); | ||
| attemptCallable.setExternalFuture(retryingFuture); | ||
| attemptCallable.call(); | ||
|
|
||
| return ApiFutures.transform( | ||
| retryingFuture, | ||
| new ApiFunction<CheckConsistencyResponse, Void>() { | ||
| @Override | ||
| public Void apply(CheckConsistencyResponse input) { | ||
| return null; | ||
| } | ||
| }, | ||
| MoreExecutors.directExecutor() | ||
| ); | ||
| } | ||
|
|
||
| /** | ||
| * A callable representing an attempt to make an RPC call. | ||
| */ | ||
| private static class AttemptCallable<RequestT, ResponseT> implements Callable<ResponseT> { | ||
| private final UnaryCallable<RequestT, ResponseT> callable; | ||
| private final RequestT request; | ||
|
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| private volatile RetryingFuture<ResponseT> externalFuture; | ||
| private volatile ApiCallContext callContext; | ||
|
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| AttemptCallable( | ||
| UnaryCallable<RequestT, ResponseT> callable, RequestT request, ApiCallContext callContext) { | ||
| this.callable = callable; | ||
| this.request = request; | ||
| this.callContext = callContext; | ||
| } | ||
|
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| void setExternalFuture(RetryingFuture<ResponseT> externalFuture) { | ||
| this.externalFuture = externalFuture; | ||
| } | ||
|
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| @Override | ||
| public ResponseT call() { | ||
| try { | ||
| // NOTE: unlike gax's AttemptCallable, this ignores rpc timeouts | ||
| externalFuture.setAttemptFuture(new NonCancellableFuture<ResponseT>()); | ||
| if (externalFuture.isDone()) { | ||
| return null; | ||
| } | ||
| ApiFuture<ResponseT> internalFuture = callable.futureCall(request, callContext); | ||
| externalFuture.setAttemptFuture(internalFuture); | ||
| } catch (Throwable e) { | ||
| externalFuture.setAttemptFuture(ApiFutures.<ResponseT>immediateFailedFuture(e)); | ||
| } | ||
|
|
||
| return null; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * A polling algorithm for waiting for a consistent {@link CheckConsistencyResponse}. Please note | ||
| * that this class doesn't handle retryable errors and expects the underlying callable chain to | ||
| * handle this. | ||
| */ | ||
| private static class PollResultAlgorithm implements | ||
| ResultRetryAlgorithm<CheckConsistencyResponse> { | ||
| @Override | ||
| public TimedAttemptSettings createNextAttempt(Throwable prevThrowable, | ||
| CheckConsistencyResponse prevResponse, TimedAttemptSettings prevSettings) { | ||
| return null; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean shouldRetry(Throwable prevThrowable, CheckConsistencyResponse prevResponse) | ||
| throws CancellationException { | ||
| return prevResponse != null && !prevResponse.getConsistent(); | ||
| } | ||
| } | ||
| } |
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