[GitHub] [kafka] ijuma commented on a diff in pull request #12945: KAFKA-14365: Refactor Fetcher to allow different implementations

[GitBox <gi...@apache.org>]

ijuma commented on code in PR #12945:
URL: https://github.com/apache/kafka/pull/12945#discussion_r1039047983


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clients/src/main/java/org/apache/kafka/clients/consumer/internals/OffsetsFinder.java:
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@@ -0,0 +1,805 @@
+/*
+ * 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.kafka.clients.consumer.internals;
+
+import org.apache.kafka.clients.ApiVersions;
+import org.apache.kafka.clients.ClientResponse;
+import org.apache.kafka.clients.Metadata;
+import org.apache.kafka.clients.NodeApiVersions;
+import org.apache.kafka.clients.StaleMetadataException;
+import org.apache.kafka.clients.consumer.LogTruncationException;
+import org.apache.kafka.clients.consumer.OffsetAndMetadata;
+import org.apache.kafka.clients.consumer.OffsetAndTimestamp;
+import org.apache.kafka.clients.consumer.OffsetResetStrategy;
+import org.apache.kafka.clients.consumer.internals.OffsetsForLeaderEpochClient.OffsetForEpochResult;
+import org.apache.kafka.clients.consumer.internals.SubscriptionState.FetchPosition;
+import org.apache.kafka.common.Cluster;
+import org.apache.kafka.common.IsolationLevel;
+import org.apache.kafka.common.KafkaException;
+import org.apache.kafka.common.Node;
+import org.apache.kafka.common.PartitionInfo;
+import org.apache.kafka.common.TopicPartition;
+import org.apache.kafka.common.errors.InvalidTopicException;
+import org.apache.kafka.common.errors.RetriableException;
+import org.apache.kafka.common.errors.TimeoutException;
+import org.apache.kafka.common.errors.TopicAuthorizationException;
+import org.apache.kafka.common.message.ApiVersionsResponseData.ApiVersion;
+import org.apache.kafka.common.message.ListOffsetsRequestData.ListOffsetsPartition;
+import org.apache.kafka.common.message.ListOffsetsResponseData.ListOffsetsPartitionResponse;
+import org.apache.kafka.common.message.ListOffsetsResponseData.ListOffsetsTopicResponse;
+import org.apache.kafka.common.protocol.ApiKeys;
+import org.apache.kafka.common.protocol.Errors;
+import org.apache.kafka.common.requests.ListOffsetsRequest;
+import org.apache.kafka.common.requests.ListOffsetsResponse;
+import org.apache.kafka.common.requests.MetadataRequest;
+import org.apache.kafka.common.requests.MetadataResponse;
+import org.apache.kafka.common.requests.OffsetsForLeaderEpochRequest;
+import org.apache.kafka.common.utils.LogContext;
+import org.apache.kafka.common.utils.Time;
+import org.apache.kafka.common.utils.Timer;
+import org.slf4j.Logger;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+public class OffsetsFinder {
+    private final Logger log;
+    private final ConsumerNetworkClient client;
+    private final Time time;
+    private final long retryBackoffMs;
+    private final long requestTimeoutMs;
+    private final ConsumerMetadata metadata;
+    private final SubscriptionState subscriptions;
+    private final IsolationLevel isolationLevel;
+    private final AtomicReference<RuntimeException> cachedListOffsetsException = new AtomicReference<>();
+    private final AtomicReference<RuntimeException> cachedOffsetForLeaderException = new AtomicReference<>();
+    private final OffsetsForLeaderEpochClient offsetsForLeaderEpochClient;
+    private final ApiVersions apiVersions;
+    private final AtomicInteger metadataUpdateVersion = new AtomicInteger(-1);
+
+    public OffsetsFinder(LogContext logContext,
+                           ConsumerNetworkClient client,
+                           ConsumerMetadata metadata,
+                           SubscriptionState subscriptions,
+                           Time time,
+                           long retryBackoffMs,
+                           long requestTimeoutMs,
+                           IsolationLevel isolationLevel,
+                           ApiVersions apiVersions) {
+        this.log = logContext.logger(Fetcher.class);
+        this.time = time;
+        this.client = client;
+        this.metadata = metadata;
+        this.subscriptions = subscriptions;
+        this.retryBackoffMs = retryBackoffMs;
+        this.requestTimeoutMs = requestTimeoutMs;
+        this.isolationLevel = isolationLevel;
+        this.apiVersions = apiVersions;
+        this.offsetsForLeaderEpochClient = new OffsetsForLeaderEpochClient(client, logContext);
+    }
+
+    /**
+     * Represents data about an offset returned by a broker.
+     */
+    static class ListOffsetData {
+        final long offset;
+        final Long timestamp; //  null if the broker does not support returning timestamps
+        final Optional<Integer> leaderEpoch; // empty if the leader epoch is not known
+
+        ListOffsetData(long offset, Long timestamp, Optional<Integer> leaderEpoch) {
+            this.offset = offset;
+            this.timestamp = timestamp;
+            this.leaderEpoch = leaderEpoch;
+        }
+    }
+
+    /**
+     * Get topic metadata for all topics in the cluster
+     * @param timer Timer bounding how long this method can block
+     * @return The map of topics with their partition information
+     */
+    public Map<String, List<PartitionInfo>> getAllTopicMetadata(Timer timer) {
+        return getTopicMetadata(MetadataRequest.Builder.allTopics(), timer);
+    }
+
+    /**
+     * Get metadata for all topics present in Kafka cluster
+     *
+     * @param request The MetadataRequest to send
+     * @param timer Timer bounding how long this method can block
+     * @return The map of topics with their partition information
+     */
+    public Map<String, List<PartitionInfo>> getTopicMetadata(MetadataRequest.Builder request, Timer timer) {

Review Comment:
   This doesn't seem related to finding offsets. Should it be somewhere else?



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