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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.kafka.clients.consumer.internals;
import org.apache.kafka.clients.ApiVersions;
import org.apache.kafka.clients.NodeApiVersions;
import org.apache.kafka.clients.consumer.OffsetAndTimestamp;
import org.apache.kafka.clients.consumer.OffsetResetStrategy;
import org.apache.kafka.common.IsolationLevel;
import org.apache.kafka.common.Node;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.errors.RetriableException;
import org.apache.kafka.common.errors.TopicAuthorizationException;
import org.apache.kafka.common.message.ApiVersionsResponseData;
import org.apache.kafka.common.message.ListOffsetsRequestData;
import org.apache.kafka.common.message.ListOffsetsResponseData;
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.OffsetsForLeaderEpochRequest;
import org.apache.kafka.common.utils.LogContext;
import org.apache.kafka.common.utils.Time;
import org.slf4j.Logger;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
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;
/**
* Utility functions for fetching offsets, validating and resetting positions.
*/
class OffsetFetcherUtils {
private final ConsumerMetadata metadata;
private final SubscriptionState subscriptionState;
private final Time time;
private final long retryBackoffMs;
private final ApiVersions apiVersions;
private final Logger log;
private final AtomicReference cachedOffsetForLeaderException = new AtomicReference<>();
private final AtomicReference cachedListOffsetsException = new AtomicReference<>();
private final AtomicInteger metadataUpdateVersion = new AtomicInteger(-1);
OffsetFetcherUtils(LogContext logContext,
ConsumerMetadata metadata,
SubscriptionState subscriptionState,
Time time,
long retryBackoffMs,
ApiVersions apiVersions) {
this.log = logContext.logger(getClass());
this.metadata = metadata;
this.subscriptionState = subscriptionState;
this.time = time;
this.retryBackoffMs = retryBackoffMs;
this.apiVersions = apiVersions;
}
/**
* Callback for the response of the list offset call.
*
* @param listOffsetsResponse The response from the server.
* @return {@link OffsetFetcherUtils.ListOffsetResult} extracted from the response, containing the fetched offsets
* and partitions to retry.
*/
OffsetFetcherUtils.ListOffsetResult handleListOffsetResponse(ListOffsetsResponse listOffsetsResponse) {
Map fetchedOffsets = new HashMap<>();
Set partitionsToRetry = new HashSet<>();
Set unauthorizedTopics = new HashSet<>();
for (ListOffsetsResponseData.ListOffsetsTopicResponse topic : listOffsetsResponse.topics()) {
for (ListOffsetsResponseData.ListOffsetsPartitionResponse partition : topic.partitions()) {
TopicPartition topicPartition = new TopicPartition(topic.name(), partition.partitionIndex());
Errors error = Errors.forCode(partition.errorCode());
switch (error) {
case NONE:
if (!partition.oldStyleOffsets().isEmpty()) {
// Handle v0 response with offsets
long offset;
if (partition.oldStyleOffsets().size() > 1) {
throw new IllegalStateException("Unexpected partitionData response of length " +
partition.oldStyleOffsets().size());
} else {
offset = partition.oldStyleOffsets().get(0);
}
log.debug("Handling v0 ListOffsetResponse response for {}. Fetched offset {}",
topicPartition, offset);
if (offset != ListOffsetsResponse.UNKNOWN_OFFSET) {
OffsetFetcherUtils.ListOffsetData offsetData = new OffsetFetcherUtils.ListOffsetData(offset, null, Optional.empty());
fetchedOffsets.put(topicPartition, offsetData);
}
} else {
// Handle v1 and later response or v0 without offsets
log.debug("Handling ListOffsetResponse response for {}. Fetched offset {}, timestamp {}",
topicPartition, partition.offset(), partition.timestamp());
if (partition.offset() != ListOffsetsResponse.UNKNOWN_OFFSET) {
Optional leaderEpoch = (partition.leaderEpoch() == ListOffsetsResponse.UNKNOWN_EPOCH)
? Optional.empty()
: Optional.of(partition.leaderEpoch());
OffsetFetcherUtils.ListOffsetData offsetData = new OffsetFetcherUtils.ListOffsetData(partition.offset(), partition.timestamp(),
leaderEpoch);
fetchedOffsets.put(topicPartition, offsetData);
}
}
break;
case UNSUPPORTED_FOR_MESSAGE_FORMAT:
// The message format on the broker side is before 0.10.0, which means it does not
// support timestamps. We treat this case the same as if we weren't able to find an
// offset corresponding to the requested timestamp and leave it out of the result.
log.debug("Cannot search by timestamp for partition {} because the message format version " +
"is before 0.10.0", topicPartition);
break;
case NOT_LEADER_OR_FOLLOWER:
case REPLICA_NOT_AVAILABLE:
case KAFKA_STORAGE_ERROR:
case OFFSET_NOT_AVAILABLE:
case LEADER_NOT_AVAILABLE:
case FENCED_LEADER_EPOCH:
case UNKNOWN_LEADER_EPOCH:
log.debug("Attempt to fetch offsets for partition {} failed due to {}, retrying.",
topicPartition, error);
partitionsToRetry.add(topicPartition);
break;
case UNKNOWN_TOPIC_OR_PARTITION:
log.warn("Received unknown topic or partition error in ListOffset request for partition {}", topicPartition);
partitionsToRetry.add(topicPartition);
break;
case TOPIC_AUTHORIZATION_FAILED:
unauthorizedTopics.add(topicPartition.topic());
break;
default:
log.warn("Attempt to fetch offsets for partition {} failed due to unexpected exception: {}, retrying.",
topicPartition, error.message());
partitionsToRetry.add(topicPartition);
}
}
}
if (!unauthorizedTopics.isEmpty())
throw new TopicAuthorizationException(unauthorizedTopics);
else
return new OffsetFetcherUtils.ListOffsetResult(fetchedOffsets, partitionsToRetry);
}
Map> regroupPartitionMapByNode(Map partitionMap) {
return partitionMap.entrySet()
.stream()
.collect(Collectors.groupingBy(entry -> metadata.fetch().leaderFor(entry.getKey()),
Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)));
}
Map getPartitionsToValidate() {
RuntimeException exception = cachedOffsetForLeaderException.getAndSet(null);
if (exception != null)
throw exception;
// Validate each partition against the current leader and epoch
// If we see a new metadata version, check all partitions
validatePositionsOnMetadataChange();
// Collect positions needing validation, with backoff
return subscriptionState
.partitionsNeedingValidation(time.milliseconds())
.stream()
.filter(tp -> subscriptionState.position(tp) != null)
.collect(Collectors.toMap(Function.identity(), subscriptionState::position));
}
void maybeSetOffsetForLeaderException(RuntimeException e) {
if (!cachedOffsetForLeaderException.compareAndSet(null, e)) {
log.error("Discarding error in OffsetsForLeaderEpoch because another error is pending", e);
}
}
/**
* If we have seen new metadata (as tracked by {@link org.apache.kafka.clients.Metadata#updateVersion()}), then
* we should check that all the assignments have a valid position.
*/
void validatePositionsOnMetadataChange() {
int newMetadataUpdateVersion = metadata.updateVersion();
if (metadataUpdateVersion.getAndSet(newMetadataUpdateVersion) != newMetadataUpdateVersion) {
subscriptionState.assignedPartitions().forEach(topicPartition -> {
ConsumerMetadata.LeaderAndEpoch leaderAndEpoch = metadata.currentLeader(topicPartition);
subscriptionState.maybeValidatePositionForCurrentLeader(apiVersions, topicPartition, leaderAndEpoch);
});
}
}
Map getOffsetResetTimestamp() {
// Raise exception from previous offset fetch if there is one
RuntimeException exception = cachedListOffsetsException.getAndSet(null);
if (exception != null)
throw exception;
Set partitions = subscriptionState.partitionsNeedingReset(time.milliseconds());
final Map offsetResetTimestamps = new HashMap<>();
for (final TopicPartition partition : partitions) {
Long timestamp = offsetResetStrategyTimestamp(partition);
if (timestamp != null)
offsetResetTimestamps.put(partition, timestamp);
}
return offsetResetTimestamps;
}
static Map buildOffsetsForTimesResult(final Map timestampsToSearch,
final Map fetchedOffsets) {
HashMap offsetsByTimes = new HashMap<>(timestampsToSearch.size());
for (Map.Entry entry : timestampsToSearch.entrySet())
offsetsByTimes.put(entry.getKey(), null);
for (Map.Entry entry : fetchedOffsets.entrySet()) {
// 'entry.getValue().timestamp' will not be null since we are guaranteed
// to work with a v1 (or later) ListOffset request
ListOffsetData offsetData = entry.getValue();
offsetsByTimes.put(entry.getKey(), new OffsetAndTimestamp(offsetData.offset, offsetData.timestamp, offsetData.leaderEpoch));
}
return offsetsByTimes;
}
private Long offsetResetStrategyTimestamp(final TopicPartition partition) {
OffsetResetStrategy strategy = subscriptionState.resetStrategy(partition);
if (strategy == OffsetResetStrategy.EARLIEST)
return ListOffsetsRequest.EARLIEST_TIMESTAMP;
else if (strategy == OffsetResetStrategy.LATEST)
return ListOffsetsRequest.LATEST_TIMESTAMP;
else
return null;
}
static Set topicsForPartitions(Collection partitions) {
return partitions.stream().map(TopicPartition::topic).collect(Collectors.toSet());
}
void updateSubscriptionState(Map fetchedOffsets,
IsolationLevel isolationLevel) {
for (final Map.Entry entry : fetchedOffsets.entrySet()) {
final TopicPartition partition = entry.getKey();
// if the interested partitions are part of the subscriptions, use the returned offset to update
// the subscription state as well:
// * with read-committed, the returned offset would be LSO;
// * with read-uncommitted, the returned offset would be HW;
if (subscriptionState.isAssigned(partition)) {
final long offset = entry.getValue().offset;
if (isolationLevel == IsolationLevel.READ_COMMITTED) {
log.trace("Updating last stable offset for partition {} to {}", partition, offset);
subscriptionState.updateLastStableOffset(partition, offset);
} else {
log.trace("Updating high watermark for partition {} to {}", partition, offset);
subscriptionState.updateHighWatermark(partition, offset);
}
}
}
}
static OffsetResetStrategy timestampToOffsetResetStrategy(long timestamp) {
if (timestamp == ListOffsetsRequest.EARLIEST_TIMESTAMP)
return OffsetResetStrategy.EARLIEST;
else if (timestamp == ListOffsetsRequest.LATEST_TIMESTAMP)
return OffsetResetStrategy.LATEST;
else
return null;
}
void onSuccessfulRequestForResettingPositions(
final Map resetTimestamps,
final ListOffsetResult result) {
if (!result.partitionsToRetry.isEmpty()) {
subscriptionState.requestFailed(result.partitionsToRetry, time.milliseconds() + retryBackoffMs);
metadata.requestUpdate();
}
for (Map.Entry fetchedOffset : result.fetchedOffsets.entrySet()) {
TopicPartition partition = fetchedOffset.getKey();
ListOffsetData offsetData = fetchedOffset.getValue();
ListOffsetsRequestData.ListOffsetsPartition requestedReset = resetTimestamps.get(partition);
resetPositionIfNeeded(
partition,
timestampToOffsetResetStrategy(requestedReset.timestamp()),
offsetData);
}
}
void onFailedRequestForResettingPositions(
final Map resetTimestamps,
final RuntimeException error) {
subscriptionState.requestFailed(resetTimestamps.keySet(), time.milliseconds() + retryBackoffMs);
metadata.requestUpdate();
if (!(error instanceof RetriableException) && !cachedListOffsetsException.compareAndSet(null,
error))
log.error("Discarding error in ListOffsetResponse because another error is pending", error);
}
// Visible for testing
void resetPositionIfNeeded(TopicPartition partition, OffsetResetStrategy requestedResetStrategy,
ListOffsetData offsetData) {
SubscriptionState.FetchPosition position = new SubscriptionState.FetchPosition(
offsetData.offset,
Optional.empty(), // This will ensure we skip validation
metadata.currentLeader(partition));
offsetData.leaderEpoch.ifPresent(epoch -> metadata.updateLastSeenEpochIfNewer(partition, epoch));
subscriptionState.maybeSeekUnvalidated(partition, position, requestedResetStrategy);
}
static Map> regroupFetchPositionsByLeader(
Map partitionMap) {
return partitionMap.entrySet()
.stream()
.filter(entry -> entry.getValue().currentLeader.leader.isPresent())
.collect(Collectors.groupingBy(entry -> entry.getValue().currentLeader.leader.get(),
Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)));
}
static boolean hasUsableOffsetForLeaderEpochVersion(NodeApiVersions nodeApiVersions) {
ApiVersionsResponseData.ApiVersion apiVersion = nodeApiVersions.apiVersion(ApiKeys.OFFSET_FOR_LEADER_EPOCH);
if (apiVersion == null)
return false;
return OffsetsForLeaderEpochRequest.supportsTopicPermission(apiVersion.maxVersion());
}
static class ListOffsetResult {
final Map fetchedOffsets;
final Set partitionsToRetry;
ListOffsetResult(Map fetchedOffsets,
Set partitionsNeedingRetry) {
this.fetchedOffsets = fetchedOffsets;
this.partitionsToRetry = partitionsNeedingRetry;
}
ListOffsetResult() {
this.fetchedOffsets = new HashMap<>();
this.partitionsToRetry = new HashSet<>();
}
}
/**
* 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 leaderEpoch; // empty if the leader epoch is not known
ListOffsetData(long offset, Long timestamp, Optional leaderEpoch) {
this.offset = offset;
this.timestamp = timestamp;
this.leaderEpoch = leaderEpoch;
}
}
}
