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[core] Migrate remaining std::unordered_map to absl::flat_hash_map #59921

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Merged
edoakes merged 4 commits into from
Jan 7, 2026
Merged

[core] Migrate remaining std::unordered_map to absl::flat_hash_map #59921

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dffe32a
[core] Replace std::unordered_map with absl::flat_hash_map
Vito-Yang Jan 7, 2026
c65e0d7
Merge branch 'ray-project:master' into migrate-unordered-map-to-flat-…
Vito-Yang Jan 7, 2026
ad9de4f
[core] remove unused #include <unordered_map>
Vito-Yang Jan 7, 2026
b459645
Merge branch 'migrate-unordered-map-to-flat-hash' of github.com:Vito-…
Vito-Yang Jan 7, 2026
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2 changes: 1 addition & 1 deletion src/ray/core_worker/core_worker.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1850,7 +1850,7 @@ class CoreWorker {
absl::flat_hash_set<TaskID> canceled_tasks_ ABSL_GUARDED_BY(mutex_);

/// Key value pairs to be displayed on Web UI.
std::unordered_map<std::string, std::string> webui_display_ ABSL_GUARDED_BY(mutex_);
absl::flat_hash_map<std::string, std::string> webui_display_ ABSL_GUARDED_BY(mutex_);

/// Actor repr name if overrides by the user, empty string if not.
std::string actor_repr_name_ ABSL_GUARDED_BY(mutex_);
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6 changes: 3 additions & 3 deletions src/ray/core_worker/experimental_mutable_object_provider.h
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Expand Up @@ -14,9 +14,9 @@
#pragma once

#include <memory>
#include <unordered_map>
#include <vector>

#include "absl/container/flat_hash_map.h"
#include "ray/common/asio/instrumented_io_context.h"
#include "ray/core_worker/experimental_mutable_object_manager.h"
#include "ray/raylet_rpc_client/raylet_client_interface.h"
Expand Down Expand Up @@ -215,7 +215,7 @@ class MutableObjectProvider : public MutableObjectProviderInterface {
// Maps the remote node object ID (i.e., the object ID that the remote node writes to)
// to the corresponding local object ID (i.e., the object ID that the local node reads
// from) and the number of readers.
std::unordered_map<ObjectID, LocalReaderInfo> remote_writer_object_to_local_reader_
absl::flat_hash_map<ObjectID, LocalReaderInfo> remote_writer_object_to_local_reader_
ABSL_GUARDED_BY(remote_writer_object_to_local_reader_lock_);

// Creates a Raylet client for each mutable object. When the polling thread detects a
Expand Down Expand Up @@ -244,7 +244,7 @@ class MutableObjectProvider : public MutableObjectProviderInterface {
// For objects larger than the gRPC max payload size *that this node receives from a
// writer node*, this map tracks how many bytes have been received so far for a single
// object write.
std::unordered_map<ObjectID, uint64_t> written_so_far_
absl::flat_hash_map<ObjectID, uint64_t> written_so_far_
ABSL_GUARDED_BY(written_so_far_lock_);

friend class MutableObjectProvider_MutableObjectBufferReadRelease_Test;
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