philipnee commented on code in PR #13380:
URL: https://github.com/apache/kafka/pull/13380#discussion_r1146969176
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/CommitRequestManager.java:
##########
@@ -207,6 +226,232 @@ public NetworkClientDelegate.UnsentRequest
toUnsentRequest() {
}
}
+ private class UnsentOffsetFetchRequest extends RequestState {
+ public final Set<TopicPartition> requestedPartitions;
+ public final GroupState.Generation requestedGeneration;
+ public CompletableFuture<Map<TopicPartition, OffsetAndMetadata>>
future;
+
+ public UnsentOffsetFetchRequest(final Set<TopicPartition> partitions,
+ final GroupState.Generation generation,
+ final long retryBackoffMs) {
+ super(retryBackoffMs);
+ this.requestedPartitions = partitions;
+ this.requestedGeneration = generation;
+ this.future = new CompletableFuture<>();
+ }
+
+ public boolean sameRequest(final UnsentOffsetFetchRequest request) {
+ return Objects.equals(requestedGeneration,
request.requestedGeneration) &&
requestedPartitions.equals(request.requestedPartitions);
+ }
+
+ public NetworkClientDelegate.UnsentRequest toUnsentRequest(final long
currentTimeMs) {
+ OffsetFetchRequest.Builder builder = new
OffsetFetchRequest.Builder(
+ groupState.groupId,
+ true,
+ new ArrayList<>(this.requestedPartitions),
+ throwOnFetchStableOffsetUnsupported);
+ NetworkClientDelegate.UnsentRequest unsentRequest = new
NetworkClientDelegate.UnsentRequest(
+ builder,
+ coordinatorRequestManager.coordinator());
+ unsentRequest.future().whenComplete((r, t) -> {
+ onResponse(currentTimeMs, (OffsetFetchResponse)
r.responseBody());
+ });
+ return unsentRequest;
+ }
+
+ public void onResponse(
+ final long currentTimeMs,
+ final OffsetFetchResponse response) {
+ Errors responseError =
response.groupLevelError(groupState.groupId);
+ if (responseError != Errors.NONE) {
+ onFailure(currentTimeMs, responseError);
+ return;
+ }
+ onSuccess(currentTimeMs, response);
+ }
+
+ private void onFailure(final long currentTimeMs,
+ final Errors responseError) {
+ log.debug("Offset fetch failed: {}", responseError.message());
+
+ // TODO: should we retry on COORDINATOR_NOT_AVAILABLE as well ?
+ if (responseError == Errors.COORDINATOR_LOAD_IN_PROGRESS) {
+ retry(currentTimeMs);
+ } else if (responseError == Errors.NOT_COORDINATOR) {
+ // re-discover the coordinator and retry
+
coordinatorRequestManager.markCoordinatorUnknown(responseError.message(),
Time.SYSTEM.milliseconds());
+ retry(currentTimeMs);
+ } else if (responseError == Errors.GROUP_AUTHORIZATION_FAILED) {
+
future.completeExceptionally(GroupAuthorizationException.forGroupId(groupState.groupId));
+ } else {
+ future.completeExceptionally(new KafkaException("Unexpected
error in fetch offset response: " + responseError.message()));
+ }
+ }
+
+ private void retry(final long currentTimeMs) {
+ onFailedAttempt(currentTimeMs);
+ onSendAttempt(currentTimeMs);
+ pendingRequests.addOffsetFetchRequest(this);
+ }
+
+ private void onSuccess(final long currentTimeMs,
+ final OffsetFetchResponse response) {
+ Set<String> unauthorizedTopics = null;
+ Map<TopicPartition, OffsetFetchResponse.PartitionData>
responseData =
+ response.partitionDataMap(groupState.groupId);
+ Map<TopicPartition, OffsetAndMetadata> offsets = new
HashMap<>(responseData.size());
+ Set<TopicPartition> unstableTxnOffsetTopicPartitions = new
HashSet<>();
+ for (Map.Entry<TopicPartition, OffsetFetchResponse.PartitionData>
entry : responseData.entrySet()) {
+ TopicPartition tp = entry.getKey();
+ OffsetFetchResponse.PartitionData partitionData =
entry.getValue();
+ if (partitionData.hasError()) {
+ Errors error = partitionData.error;
+ log.debug("Failed to fetch offset for partition {}: {}",
tp, error.message());
+
+ if (error == Errors.UNKNOWN_TOPIC_OR_PARTITION) {
+ future.completeExceptionally(new KafkaException("Topic
or Partition " + tp + " does " +
+ "not " +
+ "exist"));
+ return;
+ } else if (error == Errors.TOPIC_AUTHORIZATION_FAILED) {
+ if (unauthorizedTopics == null) {
+ unauthorizedTopics = new HashSet<>();
+ }
+ unauthorizedTopics.add(tp.topic());
+ } else if (error == Errors.UNSTABLE_OFFSET_COMMIT) {
+ unstableTxnOffsetTopicPartitions.add(tp);
+ } else {
+ future.completeExceptionally(new
KafkaException("Unexpected error in fetch offset " +
+ "response for partition " + tp + ": " +
error.message()));
+ return;
+ }
+ } else if (partitionData.offset >= 0) {
+ // record the position with the offset (-1 indicates no
committed offset to fetch);
+ // if there's no committed offset, record as null
+ offsets.put(tp, new
OffsetAndMetadata(partitionData.offset, partitionData.leaderEpoch,
partitionData.metadata));
+ } else {
+ log.info("Found no committed offset for partition {}", tp);
+ offsets.put(tp, null);
+ }
+ }
+
+ if (unauthorizedTopics != null) {
+ future.completeExceptionally(new
TopicAuthorizationException(unauthorizedTopics));
+ } else if (!unstableTxnOffsetTopicPartitions.isEmpty()) {
+ // TODO: Optimization question: Do we need to retry all
partitions upon a single partition error?
+ log.info("The following partitions still have unstable offsets
" +
+ "which are not cleared on the broker side: {}" +
+ ", this could be either " +
+ "transactional offsets waiting for completion, or " +
+ "normal offsets waiting for replication after
appending to local log", unstableTxnOffsetTopicPartitions);
+ retry(currentTimeMs);
+ } else {
+ future.complete(offsets);
+ }
+ }
+
+ private CompletableFuture<Map<TopicPartition, OffsetAndMetadata>>
chainFuture(final CompletableFuture<Map<TopicPartition, OffsetAndMetadata>>
future) {
+ return this.future.whenComplete((r, t) -> {
+ if (t != null) {
+ future.completeExceptionally(t);
+ } else {
+ future.complete(r);
+ }
+ });
+ }
+ }
+
+ /**
+ * <p>This is used to stage the unsent requests, i.e., {@link
UnsentOffsetCommitRequest} and {@link UnsentOffsetFetchRequest}.
+ *
+ * <p>If the request is new. It will be enqueued and will be sent upon the
next
+ * poll.
+ *
+ * <p>If the same request has been sent, the request's {@code
CompletableFuture} will be completed upon the
+ * completion of the existing one.
+ *
+ * <p>There is a special handling for the {@link
UnsentOffsetFetchRequest}. If a duplicated request was sent
+ * previously, we will chain the future to the current future.
+ */
+
+ class PendingRequests {
+ // Queue is used to ensure the sequence of commit
+ Queue<UnsentOffsetCommitRequest> unsentOffsetCommits = new
LinkedList<>();
+ List<UnsentOffsetFetchRequest> unsentOffsetFetches = new ArrayList<>();
+ List<UnsentOffsetFetchRequest> inflightOffsetFetches = new
ArrayList<>();
+
+ public boolean hasUnsentRequests() {
+ return !unsentOffsetCommits.isEmpty() ||
!unsentOffsetFetches.isEmpty();
+ }
+
+ public CompletableFuture<ClientResponse> addOffsetCommitRequest(final
Map<TopicPartition, OffsetAndMetadata> offsets) {
+ UnsentOffsetCommitRequest request = new UnsentOffsetCommitRequest(
+ offsets,
+ groupState.groupId,
+ groupState.groupInstanceId.orElse(null),
+ groupState.generation);
+ unsentOffsetCommits.add(request);
+ return request.future();
+ }
+
+ /**
+ * We want to avoid duplication when sending an {@link
OffsetFetchRequest}. The following checks are done:
+ * <li>1. dedupe against unsents: if a duplicated request was
previously made, we chain the future</>
+ * <li>2. dedupe against incompleted: If a duplicated request was
sent but hasn't gotten a results, we chain
+ * the future.</>
+ *
+ * <p>If the request is new, we chain a call back to remove itself
from the {@code inflightOffsetFetches}
+ * upon completion.</>
+ */
+ private CompletableFuture<Map<TopicPartition, OffsetAndMetadata>>
addOffsetFetchRequest(final UnsentOffsetFetchRequest request) {
+ Optional<UnsentOffsetFetchRequest> dupe =
+ unsentOffsetFetches.stream().filter(r ->
r.sameRequest(request)).findAny();
+ Optional<UnsentOffsetFetchRequest> inflight =
+ inflightOffsetFetches.stream().filter(r ->
r.sameRequest(request)).findAny();
+
+ if (dupe.isPresent() || inflight.isPresent()) {
+ log.info("Duplicated OffsetFetchRequest: " +
request.requestedPartitions);
+ dupe.orElseGet(() ->
inflight.get()).chainFuture(request.future);
+ } else {
+ // remove the request from the outbound buffer:
inflightOffsetFetches
+ request.future.whenComplete((r, t) -> {
+ if (!inflightOffsetFetches.remove(request)) {
Review Comment:
Agreed, let's log a warning for this case.
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