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Users across Tokyo, London, and New York are simultaneously editing the same document. With single-leader replication, every keystroke from Tokyo must travel to the leader in Virginia, be processed, and replicate back—introducing latency that transforms real-time collaboration into a frustrating experience. **Multi-leader replication** emerges as a solution to this fundamental constraint. Instead of funneling all writes through a single node, what if multiple nodes—each strategically positioned—could independently accept writes? Each datacenter, each region, or even each client could have its own leader, processing writes locally with sub-millisecond latency. But this architectural freedom comes at a profound cost: the same data might be modified simultaneously in multiple places, creating *conflicts* that don't exist in single-leader systems. Understanding multi-leader replication means understanding both its liberating possibilities and its inherent complexities.72:T43b,**The Availability Problem:** With single-leader replication, the leader is a **single point of failure** for write operations. If the leader becomes unavailable due to: - Network partition isolating the leader's datacenter - Hardware failure requiring failover - Planned maintenance requiring brief unavailability ...then *all writes globally* are blocked until either the leader recovers or a new leader is elected. Failover can take seconds to minutes depending on detection mechanisms and consensus protocols. During this window, users experience write unavailability. **The Datacenter Operations Problem:** Organizations operating globally face operational constraints: - **Regulatory requirements**: Data for European users might need to be processed within the EU (GDPR) - **Disaster recovery**: A single datacenter failure shouldn't halt business operations - **Organizational autonomy**: Different teams in different regions might need independent write capabilities Single-leader replication, by design, cannot address these requirements while maintaining consistency.73:T42e,**Key Characteristics:** **1. Write Locality:** Users write to their nearest leader. A user in Munich writes to the Frankfurt leader; a user in San Francisco writes to the Virginia leader. This reduces write latency from 150-300ms (cross-continental) to 10-30ms (regional). **2. Asynchronous Replication Between Leaders:** Leader-to-leader replication is **asynchronous**. The Frankfurt leader doesn't wait for Virginia or Tokyo to acknowledge before confirming a write to the user. This is critical—synchronous cross-continental replication would reintroduce the latency we're trying to avoid. **3. Conflict Possibility:** Because leaders accept writes independently and asynchronously, the same data might be modified at multiple leaders before those modifications propagate. This creates **write conflicts** that must be detected and resolved. **4. Eventual Convergence:** Despite conflicts, all leaders must eventually **converge** to the same state. The system must have mechanisms to ensure that, given time without new writes, all replicas become identical.74:T43e,**Conflict Detection Mechanisms:** **1. Version Vectors / Vector Clocks:** Each record carries a version vector [Leader_A: 3, Leader_B: 5, Leader_C: 2] indicating the latest version from each leader that has been incorporated. When a write arrives, the system compares version vectors: - If the incoming version **dominates** the local version (all components ≥), it's a simple update - If the local version **dominates** the incoming version, the incoming write is stale and ignored - If neither dominates (concurrent modifications), **conflict detected** **2. Conflict-Free Reads for Conflict Detection:** Some systems defer conflict detection until read time. Multiple concurrent writes are stored as **siblings**. When a client reads, it receives all siblings and must resolve them (application-level resolution). **3. Row-Level Change Tracking:** Simpler systems track only the last-modified timestamp or sequence number. They cannot detect true concurrency—only which write appeared 'later'. This enables Last-Write-Wins but cannot support more sophisticated resolution.75:T5ce,interface VersionVector { [leaderId: string]: number; } interface VersionedRecord { data: T; version: VersionVector; } function detectConflict( local: VersionedRecord, incoming: VersionedRecord ): 'incoming-wins' | 'local-wins' | 'conflict' { const localDominates = doesDominate(local.version, incoming.version); const incomingDominates = doesDominate(incoming.version, local.version); if (incomingDominates && !localDominates) { return 'incoming-wins'; // Simple update, apply incoming } if (localDominates && !incomingDominates) { return 'local-wins'; // Stale write, ignore incoming } return 'conflict'; // Concurrent modifications, resolve! } function doesDominate(a: VersionVector, b: VersionVector): boolean { // a dominates b if every component of a >= corresponding component of b const allKeys = new Set([...Object.keys(a), ...Object.keys(b)]); for (const key of allKeys) { if ((a[key] || 0) < (b[key] || 0)) { return false; } } return true; } // Example: Concurrent conflict const localRecord: VersionedRecord = { data: 'Modified at Leader A', version: { 'leader-a': 5, 'leader-b': 3 } }; const incomingWrite: VersionedRecord = { data: 'Modified at Leader B', version: { 'leader-a': 4, 'leader-b': 4 } }; console.log(detectConflict(localRecord, incomingWrite)); // Output: 'conflict' // B has higher component than A (4 > 3), A has higher component than B (5 > 4)45:["$","$L70",null,{"owner":"anonymous","state":{"mutations":[],"queries":[{"dehydratedAt":1792198197777,"state":{"data":{"json":{"archivedAt":null,"id":"seed_8e9996a306ee9551b4e0eb8e18423c97","slug":"hld-system-design","title":"High-Level System Design","description":"Master high-level system design across 44 chapters and 1338+ pages.","image":null,"color":"#2563EB","keyTopics":["Scalability and reliability","Distributed systems","Storage and databases","Caching and performance","Messaging and eventing","Security and 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Acknowledgment returns to Tokyo (75-125ms)\n\n**Total perceived latency: 150-250ms per keystroke.** This is noticeable and frustrating for real-time applications."},"type":"text"},{"data":{"rows":[["New York ↔ London","5,500 km","55ms","70-90ms"],["New York ↔ Tokyo","11,000 km","110ms","150-200ms"],["London ↔ Sydney","17,000 km","170ms","250-300ms"],["São Paulo ↔ Singapore","16,000 km","160ms","280-350ms"]],"caption":"Cross-Continental Latency Realities","headers":["Route","Physical Distance","Theoretical Minimum RTT","Typical Real-World RTT"]},"type":"table"},{"data":{"content":"$72"},"type":"text"},{"data":{"icon":"AlertCircle","title":"The Fundamental Trade-off Ahead","content":"Multi-leader replication trades write latency and availability for complexity and potential conflicts. Before adopting it, ask: Is the latency improvement critical for my use case? Can my application tolerate and resolve conflicts? The answer isn't always yes.","variant":"warning"},"type":"callout"}],"titleType":"number","titleNumber":1},{"id":"multi-leader-architecture","title":"Multi-Leader Architecture Fundamentals","content":[{"data":{"content":"Multi-leader replication (also known as **multi-master** or **active-active** replication) allows multiple nodes to accept write operations independently. Each leader processes writes locally, then **asynchronously** propagates those writes to other leaders.\n\n**The Core Architecture:**\n\nIn a multi-leader setup:\n1. **Multiple leaders** exist across different locations (typically datacenters or regions)\n2. Each leader maintains a **complete copy** of the database\n3. Writes are accepted by **any leader** based on routing logic (usually geographic proximity)\n4. Each leader **asynchronously replicates** its writes to all other leaders\n5. Each leader may also have **followers** for read scaling within its region"},"type":"text"},{"data":{"height":"500px","mermaidSyntax":"graph TB\n subgraph \"US-East Datacenter\"\n L1[Leader 1\nVirginia]\n F1A[Follower 1A]\n F1B[Follower 1B]\n L1 --> F1A\n L1 --> F1B\n end\n \n subgraph \"EU-West Datacenter\"\n L2[Leader 2\nFrankfurt]\n F2A[Follower 2A]\n F2B[Follower 2B]\n L2 --> F2A\n L2 --> F2B\n end\n \n subgraph \"Asia-Pacific Datacenter\"\n L3[Leader 3\nTokyo]\n F3A[Follower 3A]\n F3B[Follower 3B]\n L3 --> F3A\n L3 --> F3B\n end\n \n L1 <--> L2\n L2 <--> L3\n L1 <--> L3\n \n USUsers[US Users] --> L1\n EUUsers[EU Users] --> L2\n APACUsers[APAC Users] --> L3"},"type":"mermaid-excalidraw"},{"data":{"content":"$73"},"type":"text"},{"data":{"icon":"Info","title":"Terminology Note","content":"You'll encounter various terms: multi-leader, multi-master, active-active, and multi-primary. These all describe the same fundamental architecture. 'Active-active' emphasizes that all leaders actively accept writes, as opposed to 'active-passive' where only one node accepts writes.","variant":"note"},"type":"callout"}],"titleType":"number","titleNumber":2},{"id":"write-processing-propagation","title":"Write Processing and Propagation","content":[{"data":{"content":"Understanding how writes flow through a multi-leader system is essential for reasoning about conflicts and consistency. Let's trace a write operation from user request to global propagation.\n\n**The Write Lifecycle in Multi-Leader Systems:**"},"type":"text"},{"data":{"type":"ordered","items":["**User Request Routing**: The client's write request is routed to the nearest leader based on geographic proximity, load balancing policies, or explicit configuration. DNS-based routing, anycast, or application-level routing can accomplish this.","**Local Processing**: The receiving leader validates the write, applies any business logic, and persists it to its local storage. This happens with the same guarantees as a single-leader system—durability, transaction semantics, etc.","**Local Acknowledgment**: The leader acknowledges the write to the user. At this point, from the user's perspective, the write is complete. This is the key latency optimization—no cross-continental round trip needed.","**Replication Log Entry**: The write is appended to a replication log (write-ahead log, binlog, or logical replication stream). This log captures changes in a format suitable for transmission to other leaders.","**Asynchronous Propagation**: The replication log entries are transmitted to other leaders. This happens continuously in the background, typically with configurable batching and throttling.","**Remote Application**: Other leaders receive the replicated writes and apply them to their local storage. If conflicts are detected (the same record was modified locally), conflict resolution logic is invoked.","**Downstream Follower Replication**: Each leader replicates the combined stream of local and remote writes to its own followers, enabling read scaling."],"title":{"icon":"Zap","text":"Write Operation Stages","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"**Replication Lag and Its Implications:**\n\nThe time between a write being acknowledged at one leader and becoming visible at another is called **replication lag**. In multi-leader systems, this lag varies based on:\n\n- **Network latency** between datacenters (50-300ms)\n- **Processing load** on leaders\n- **Batching configuration** (trading latency for throughput)\n- **Network congestion** and available bandwidth\n\nTypical inter-leader replication lag ranges from **100ms to several seconds**. During this window:\n- A user who wrote at Leader A might read stale data if they're redirected to Leader B\n- Two users might make conflicting modifications without awareness of each other's changes\n- Aggregation queries across the dataset might see inconsistent snapshots"},"type":"text"},{"data":{"code":"Timeline: Multi-Leader Write Propagation\n\nT=0ms User in Tokyo submits UPDATE balance = 5000 WHERE user_id = 'alice'\nT=2ms Request received by Tokyo Leader\nT=5ms Tokyo Leader validates and applies write locally\nT=7ms Write appended to Tokyo's replication log\nT=10ms User receives acknowledgment (write complete from user's view)\n\n--- Asynchronous propagation begins ---\n\nT=15ms Replication batch prepared for transmission\nT=20ms Batch transmitted to Frankfurt and Virginia Leaders\n\nT=180ms Frankfurt Leader receives batch (160ms network latency)\nT=185ms Frankfurt applies write, checks for conflicts\nT=190ms Frankfurt's followers begin replicating the change\n\nT=220ms Virginia Leader receives batch (200ms network latency)\nT=225ms Virginia applies write, checks for conflicts\nT=230ms Virginia's followers begin replicating the change\n\nT=250ms Write is visible globally across all leaders and followers","fileName":"write-propagation-timeline.txt","showLineNumbers":true},"type":"code"},{"data":{"icon":"Lightbulb","title":"Design Principle","content":"The asynchronous nature of inter-leader replication means you cannot provide 'read-your-writes' consistency across leaders by default. Users should be routed consistently to the same leader, or applications must implement session affinity, to avoid reading their own stale data.","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":3},{"id":"replication-topologies","title":"Replication Topologies","content":[{"data":{"content":"When multiple leaders must exchange writes, the **topology**—how leaders are connected—becomes a critical architectural decision. Different topologies offer different trade-offs in fault tolerance, latency, and complexity.\n\n**The Three Primary Topologies:**"},"type":"text"},{"data":{"left":[{"data":{"items":["Each leader replicates to exactly one other leader","Forms a ring: A → B → C → A","Writes propagate around the ring sequentially","**Advantage**: Simple configuration, predictable paths","**Disadvantage**: Single node failure breaks the ring","**Latency**: High for distant pairs (N-1 hops worst case)"],"title":{"icon":"Target","text":"Circular Topology","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}],"right":[{"data":{"items":["One designated 'root' leader connects to all others","All writes flow through the root: A ↔ Root ↔ B","Root forwards writes between other leaders","**Advantage**: Simple routing, 2 hops between any pair","**Disadvantage**: Root is a single point of failure","**Latency**: Consistent but limited by root placement"],"title":{"icon":"Target","text":"Star Topology","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}]},"type":"two-column"},{"data":{"content":"**All-to-All (Mesh) Topology:**\n\nThe most robust and commonly used topology for production multi-leader deployments."},"type":"text"},{"data":{"items":["**Every leader connects to every other leader** — Forms a complete graph","**Direct propagation** — Writes reach all leaders in a single hop","**Maximum fault tolerance** — Any leader can fail without disrupting replication between others","**Optimal latency** — No intermediate forwarding; direct cross-continental paths","**Complexity** — Requires N×(N-1)/2 connections for N leaders","**Ordering challenges** — Writes can arrive at different leaders in different orders"],"title":{"icon":"CheckCircle","text":"All-to-All Topology Characteristics","type":"icon","color":"primary","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"height":"350px","mermaidSyntax":"graph LR\n subgraph \"All-to-All Topology\"\n A1[Leader A] <--> B1[Leader B]\n B1 <--> C1[Leader C]\n A1 <--> C1\n end\n \n subgraph \"Circular Topology\"\n A2[Leader A] --> B2[Leader B]\n B2 --> C2[Leader C]\n C2 --> A2\n end\n \n subgraph \"Star Topology\"\n A3[Leader A] <--> Root[Root Leader]\n Root <--> B3[Leader B]\n Root <--> C3[Leader C]\n end"},"type":"mermaid-excalidraw"},{"data":{"content":"**Handling Message Ordering in All-to-All:**\n\nIn all-to-all topologies, a critical problem arises: **writes can arrive out of order**. Consider:\n\n1. At T=0, Leader A creates record R\n2. At T=1, Leader A updates record R\n3. Both writes propagate to Leaders B and C\n\nDue to network variability, Leader B might receive them in order (create, then update), while Leader C receives them out of order (update arrives before create). The update on a non-existent record fails or causes undefined behavior.\n\n**Solutions:**\n\n- **Logical timestamps**: Each write carries a logical timestamp (Lamport clock or vector clock). Receivers buffer out-of-order writes until dependencies arrive.\n- **Causal dependency tracking**: Writes include metadata about which prior writes they depend on. Receivers apply writes only after dependencies are satisfied.\n- **Log sequence numbers**: Each leader's writes are sequenced. Receivers apply writes in sequence order, buffering gaps."},"type":"text"},{"data":{"icon":"Info","title":"Production Reality","content":"Most production multi-leader systems (MySQL Group Replication, PostgreSQL BDR, CockroachDB, Spanner) use all-to-all topology with sophisticated conflict detection and ordering mechanisms. The added complexity is justified by the fault tolerance and latency benefits.","variant":"note"},"type":"callout"}],"titleType":"number","titleNumber":4},{"id":"conflict-detection-fundamentals","title":"Conflict Detection Fundamentals","content":[{"data":{"content":"Unlike single-leader systems where the leader serializes all writes, multi-leader systems can have **concurrent, conflicting writes**. Detecting these conflicts is the first step toward resolving them.\n\n**What Constitutes a Conflict?**\n\nA conflict occurs when two or more leaders independently modify the same data in ways that cannot be trivially merged. The classic example:\n\n- At T=0, Record R has value 'Original'\n- At T=1, Leader A receives: SET R = 'Value A'\n- At T=1, Leader B receives: SET R = 'Value B'\n- Neither leader knows about the other's write when processing\n\nWhen these writes propagate:\n- Leader A receives 'Value B' but already has 'Value A'\n- Leader B receives 'Value A' but already has 'Value B'\n\n**Which value should win?** This is the conflict that must be detected and resolved."},"type":"text"},{"data":{"items":["**Write-Write Conflicts**: The same field or record is modified at multiple leaders. The most common and challenging conflict type.","**Uniqueness Constraint Violations**: Two leaders independently create records with the same unique key (e.g., email address, username).","**Referential Integrity Violations**: Leader A deletes a parent record while Leader B creates a child referencing it.","**Application-Level Semantic Conflicts**: Writes that are technically compatible at the database level but violate business rules (e.g., double-booking a limited resource)."],"title":{"icon":"AlertCircle","text":"Categories of Conflicts","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"content":"$74"},"type":"text"},{"data":{"fileName":"version-vector-conflict-detection.ts","languages":[{"code":"$75","label":"TypeScript","value":"typescript"}],"showLineNumbers":true},"type":"code"},{"data":{"icon":"Lightbulb","title":"Detection Is Just the Beginning","content":"Detecting conflicts is mechanical—comparing versions is algorithmic. The hard part is resolution: determining what the 'correct' value should be when two users simultaneously made incompatible changes. We'll explore resolution strategies in depth in subsequent pages.","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":5},{"id":"practical-considerations","title":"Practical Considerations and Trade-offs","content":[{"data":{"content":"Multi-leader replication is not a universal solution. It introduces significant complexity and is appropriate only for specific use cases. Understanding these trade-offs is essential for making informed architectural decisions."},"type":"text"},{"data":{"rows":[["Write Latency","High for distant users (100-300ms)","Low for all users (10-30ms)"],["Write Availability","Blocked during leader failover","Available if any leader is reachable"],["Consistency Model","Strongly consistent writes","Eventually consistent, conflicts possible"],["Operational Complexity","Simple, well-understood","Complex conflict resolution required"],["Application Complexity","Standard CRUD patterns work","Must handle/design for conflicts"],["Read-Your-Writes","Guaranteed naturally","Requires session affinity"],["Debugging","Straightforward linear history","Complex branching history"]],"caption":"Multi-Leader vs Single-Leader Trade-offs","headers":["Dimension","Single-Leader","Multi-Leader"]},"type":"table"},{"data":{"content":"**When Multi-Leader Is Appropriate:**\n\n1. **Truly global user base** with latency-sensitive write operations (collaborative editing, gaming, trading)\n2. **Disconnected operation requirements** where clients must function offline and sync later (mobile apps, offline-first systems)\n3. **Multi-datacenter deployments** requiring write availability during datacenter failures or network partitions\n4. **Use cases where conflicts are rare** or have natural resolution strategies (e.g., shopping carts can union items)\n\n**When Multi-Leader Is Problematic:**\n\n1. **Financial transactions** where consistency is non-negotiable (bank transfers, inventory with strict limits)\n2. **Unique constraint enforcement** that cannot tolerate even temporary violations (username registration)\n3. **Systems with complex referential integrity** that would create cascading conflicts\n4. **Teams without expertise** in distributed systems debugging and conflict resolution"},"type":"text"},{"data":{"icon":"AlertCircle","title":"The Hidden Cost of Conflicts","content":"Even with automated conflict resolution (like Last-Write-Wins), conflicts represent data loss. One user's write is discarded. Systems that seem to 'work' might be silently losing data under concurrent writes. Before choosing multi-leader, quantify your expected conflict rate and the business impact of each conflicted write.","variant":"warning"},"type":"callout"}],"titleType":"number","titleNumber":6},{"id":"summary-path-forward","title":"Summary: Multiple Leaders for Writes","content":[{"data":{"content":"We've established the foundational understanding of multi-leader replication. Let's consolidate the key concepts:"},"type":"text"},{"data":{"type":"ordered","items":["**Multi-leader replication allows multiple nodes to accept writes independently**, overcoming the single-leader bottleneck for latency and availability.","**Writes are processed locally and acknowledged immediately**, then asynchronously propagated to other leaders.","**Three topologies exist**: circular (simple but fragile), star (centralized but limited), and all-to-all (robust but complex).","**Replication lag between leaders** means users might see stale data if routed to different leaders.","**Conflicts arise from concurrent writes** and must be detected using mechanisms like version vectors.","**Multi-leader is appropriate for global, latency-sensitive, conflict-tolerant workloads**—not for strict consistency requirements."],"title":{"icon":"CheckCircle","text":"Key Takeaways","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"**What's Next:**\n\nNow that we understand how multi-leader systems are architectured, we'll explore the **specific use cases** where multi-leader replication shines. The next page examines multi-datacenter deployments—the primary production scenario for multi-leader systems—and how organizations like Netflix, Google, and Uber architect their global data platforms."},"type":"text"},{"data":{"icon":"CheckCircle","title":"Page Complete","content":"You now understand the fundamental architecture of multi-leader replication—why it exists, how writes flow through the system, and the topologies that connect leaders. Next, we'll see these concepts applied to real-world multi-datacenter deployments.","variant":"success"},"type":"callout"}],"titleType":"number","titleNumber":7}],"isLocked":false},{"id":"seed_465d443fe64145186605b71d482f4fc7","title":"Use Cases: Multi-Datacenter Deployments","order":1,"content":null,"isLocked":true},{"id":"seed_e8af84a22be4e909ac6108cb498ba1cb","title":"Conflict Resolution Strategies","order":2,"content":null,"isLocked":true},{"id":"seed_b79b79762940d8f5fec0f2c04f0da174","title":"Last-Write-Wins (LWW) Deep Dive","order":3,"content":null,"isLocked":true},{"id":"seed_bb3784380561d115d22c48f7495b9483","title":"Custom Conflict Resolution","order":4,"content":null,"isLocked":true}]}},"dataUpdateCount":1,"dataUpdatedAt":1792198197711,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getModule"],{"input":{"slug":"multi-leader-replication"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getModule\"],{\"input\":{\"slug\":\"multi-leader-replication\"},\"type\":\"query\"}]"},{"dehydratedAt":1792198197789,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792198197712,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getProgress"],{"input":{"moduleId":"seed_b5e44c38751f0ecc56d78296acf3188b"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getProgress\"],{\"input\":{\"moduleId\":\"seed_b5e44c38751f0ecc56d78296acf3188b\"},\"type\":\"query\"}]"},{"dehydratedAt":1792198197789,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792198197712,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","get"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_bb3784380561d115d22c48f7495b9483"},"type":"query"}],"queryHash":"[[\"feedback\",\"get\"],{\"input\":{\"contentId\":\"seed_bb3784380561d115d22c48f7495b9483\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792198197789,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792198197712,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","getUserLike"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_bb3784380561d115d22c48f7495b9483"},"type":"query"}],"queryHash":"[[\"feedback\",\"getUserLike\"],{\"input\":{\"contentId\":\"seed_bb3784380561d115d22c48f7495b9483\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792198197789,"state":{"data":{"json":[]},"dataUpdateCount":1,"dataUpdatedAt":1792198197712,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["highlights","getHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_bb3784380561d115d22c48f7495b9483"},"type":"query"}],"queryHash":"[[\"highlights\",\"getHighlights\"],{\"input\":{\"contentId\":\"seed_bb3784380561d115d22c48f7495b9483\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792198197789,"state":{"data":"$undefined","dataUpdateCount":0,"dataUpdatedAt":0,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"pending","fetchStatus":"fetching"},"queryKey":[["highlights","getPopularHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_bb3784380561d115d22c48f7495b9483","minCount":2},"type":"query"}],"queryHash":"[[\"highlights\",\"getPopularHighlights\"],{\"input\":{\"contentId\":\"seed_bb3784380561d115d22c48f7495b9483\",\"contentType\":\"LEARNING_PAGE\",\"minCount\":2},\"type\":\"query\"}]","promise":"$@76"}]},"children":"$L77"}]