ryerraguntla commented on code in PR #4259:
URL: https://github.com/apache/iggy/pull/4259#discussion_r4077007234
##########
gateways/kafka/src/protocol/handlers/list_offsets.rs:
##########
@@ -17,44 +17,272 @@
//! `ListOffsets` (API key 2).
+use std::collections::{HashMap, HashSet};
+use std::time::Duration;
+
use bytes::Bytes;
+use kafka_protocol::messages::list_offsets_request::{ListOffsetsPartition,
ListOffsetsTopic};
use kafka_protocol::messages::list_offsets_response::{
ListOffsetsPartitionResponse, ListOffsetsTopicResponse,
};
use kafka_protocol::messages::{ListOffsetsRequest, ListOffsetsResponse};
+use crate::bridge::{BridgeError, IggyBridge};
use crate::error::Result;
use crate::protocol::api::{
- API_KEY_LIST_OFFSETS, ApiVersionRange, ERROR_NOT_LEADER_OR_FOLLOWER,
GatewayState,
- HandleOutcome,
+ API_KEY_LIST_OFFSETS, ApiVersionRange, ERROR_INVALID_REQUEST,
ERROR_NOT_LEADER_OR_FOLLOWER,
+ ERROR_REQUEST_TIMED_OUT, ERROR_UNKNOWN_SERVER_ERROR,
ERROR_UNKNOWN_TOPIC_OR_PARTITION,
+ GatewayState, HandleOutcome,
};
use crate::protocol::bounds_guard::validate_list_offsets_shape;
-use crate::protocol::handlers::{decode_guarded, encode_message,
handle_versioned_request};
+use crate::protocol::handlers::{
+ decode_guarded, encode_message, handle_versioned_request,
is_supported_version,
+ respond_or_close, unsupported_version_response,
+};
pub const RANGE: ApiVersionRange = ApiVersionRange {
api_key: API_KEY_LIST_OFFSETS,
min_version: 1,
max_version: 6,
};
-#[expect(
- clippy::unused_async,
- reason = "the shared handler signature, kept until a handler awaits the
bridge"
-)]
+/// Cap on distinct topics one `ListOffsets` request may address through the
bridge.
+///
+/// `bounds_guard`'s `MAX_REQUEST_ELEMENTS` (4,096) is a pre-decode `DoS`
ceiling, not a usability
+/// recommendation: each distinct topic here costs one `high_watermarks` round
trip against the
+/// single lockstep `IggyClient` every Kafka connection on this gateway shares
+/// (`bridge/iggy_bridge/mod.rs`'s "Concurrency ceiling"), so a large batch
head-of-line-blocks
+/// every other client's control plane for its duration. 100 keeps a
worst-case batch's aggregate
Review Comment:
Fixed file reference; softened claim to "blocks only the call in flight."
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