Layer 2 — application architecture · 1,820 documents
| ID | Document | Source |
|---|---|---|
| app_invariants__556381b14e28f0c2 | INVARIANT: API capability negotiation must resolve to the strict intersection of supported version ranges. SHADOW: Nodes in a distributed cluster communicate using diverse software versions. The… | — |
| app_invariants__76f67d2fa968730b | INVARIANT: Transactional end-states require explicit Producer ID and Epoch binding to neutralize 'Zombie' producers. SHADOW: In a distributed transaction, a delayed request from an old leader or… | — |
| app_invariants__5df374ade0dd39d8 | INVARIANT: Memory allocation for network buffers must be bounded by a pool with hard limits and proactive reclamation. SHADOW: Under heavy load, unbounded object creation for incoming requests leads… | — |
| app_invariants__f3a1df81a2742d79 | INVARIANT: Exception handling must distinguish between 'Transient Retriable' and 'Metadata-Refresh Retriable' states. SHADOW: Retrying a request blindly can lead to infinite loops. The system… | — |
| app_invariants__4e64ffe94bd706cc | INVARIANT: Internal timers must enforce non-monotonicity protection to prevent deadline corruption. SHADOW: System clocks can drift or be reset. Software timers (Timer utility) must internally… | — |
| app_invariants__5f0b3ce8de6216d8 | INVARIANT: Zero-copy serialization must prioritize buffer slicing over data duplication to maintain throughput linearity. SHADOW: Copying bytes between buffers during message framing consumes CPU… | — |
| app_invariants__58d317e1aac66a89 | INVARIANT: Certificate generation methods MUST produce valid X509 certificates with correct validity periods and distinguished names. SHADOW: Ensures that generated certificates are structurally… | — |
| app_invariants__416e0b4e80d8b1cf | INVARIANT: Key stores and trust stores MUST be correctly initialized, populated, and saved to disk or memory with specified passwords. SHADOW: Guarantees the integrity and accessibility of… | — |
| app_invariants__fd21b54532a7e619 | INVARIANT: SSL configuration maps MUST consistently define all necessary parameters for SSLContext creation and management. SHADOW: Ensures that the SSL/TLS handshake process has all required… | — |
| app_invariants__9f4c6a4f3e54bb54 | INVARIANT: Conversion to PEM format MUST correctly export and, if requested, encrypt private keys and export certificate chains. SHADOW: Ensures that cryptographic material is represented in a… | — |
| app_invariants__5b765467ef6609ad | INVARIANT: The CertificateBuilder MUST correctly handle Distinguished Names (DNs) and associate them with generated certificates. SHADOW: Ensures that each certificate has a unique and correctly… | — |
| app_invariants__46b8c3591c914389 | INVARIANT: Certificate generation MUST correctly apply signing algorithms and use appropriate key parameters for signature generation. SHADOW: Ensures the cryptographic integrity of certificates… | — |
| app_invariants__24067dd44fb9841c | INVARIANT: Subject Alternative Names (SANs) MUST be correctly encoded and added to certificates when provided. SHADOW: Enables certificates to be valid for multiple hostnames or IP addresses,… | — |
| app_invariants__0c65b9f3675e957d | INVARIANT: The SSL configuration builder MUST correctly create JKS or PEM formatted configurations based on the `usePem` flag. SHADOW: Provides flexibility in how SSL configurations are generated,… | — |
| app_invariants__c70ad408dcaf105e | INVARIANT: Key stores MUST be created with the correct alias, private key, certificate chain, and passwords. SHADOW: Ensures that private keys and their associated certificates are securely stored… | — |
| app_invariants__e3d9cd4eb57ababc | INVARIANT: Trust stores MUST be created by adding certificate entries with their respective aliases. SHADOW: Establishes the set of trusted root certificates, enabling the validation of certificate… | — |
| app_invariants__06c6167c524254e3 | INVARIANT: Lifecycle State Transition Monotonicity SHADOW: The KafkaStreams.State enum defines a directed graph of valid transitions. This prevents illegal operations like shutting down a service… | — |
| app_invariants__e3fa74ac3205415c | INVARIANT: Window Retention Sufficiency Constraint SHADOW: In WindowStoreMaterializer and SlidingWindowStoreMaterializer, the retention period must be strictly greater than or equal to the window… | — |
| app_invariants__3c180d4ee1dcd11f | INVARIANT: Causal Consistency via Position Bounds SHADOW: The Position and PositionBound classes track offsets across multiple topics and partitions. Queries against state stores (StateQueryRequest)… | — |
| app_invariants__2e828be48cf0bdd4 | INVARIANT: Null-Key/Value Exclusion in Stateful Aggregates SHADOW: In KStreamAggregate and KStreamReduce, records with null keys or null values are explicitly dropped and recorded via a… | — |
| app_invariants__fe8421945f2de757 | INVARIANT: Change-Log Propagation (Old Value Preservation) SHADOW: KTable operations (like KTableSource and KTableReduce) support 'enableSendingOldValues'. This is necessary for downstream joins and… | — |
| app_invariants__3d870bd4c1fa156d | INVARIANT: Temporal Grace Period Enforcement SHADOW: The AbstractKStreamTimeWindowAggregateProcessor drops records where the timestamp is older than the 'observedStreamTime - gracePeriod'. This acts… | — |
| app_invariants__ddd07acf077c224e | INVARIANT: Topology Dependency Ordering SHADOW: The GraphNode.writeToTopology method requires that all parent nodes are written to the topology before child nodes. This ensures that the physical… | — |
| app_invariants__6db40560f2eb2a11 | INVARIANT: Repartitioning Necessity for Key-Space Alignment SHADOW: Operations like KGroupedStreamImpl and KGroupedTableImpl trigger a repartitioning phase (creating a sink and source for a… | — |
| app_invariants__f32a0b6c51e6b362 | INVARIANT: Checkpoint updates must utilize a temporary-file-write followed by an atomic filesystem move to prevent state corruption during process crashes. SHADOW: If a crash occurs during a direct… | — |
| app_invariants__91dfccc432c31372 | INVARIANT: Suppression buffers must enforce hard limits on record count or byte size, triggering either a terminal shutdown or an eager emission to protect the JVM heap. SHADOW: Unbounded… | — |
| app_invariants__3501e1246a76b4c9 | INVARIANT: Versioned state stores must reject 'out-of-order' writes where the record timestamp is older than the current stream time minus the defined grace period. SHADOW: In a temporal database,… | — |
| app_invariants__3d54be9a49ed6899 | INVARIANT: State stores must maintain a 1:1 mapping between local disk segments and changelog offsets to ensure recovery is resume-able rather than restart-able. SHADOW: By checkpointing the… | — |
| app_invariants__d34021853e221a0b | INVARIANT: The ThreadCache must implement a global memory-pressure-driven eviction policy across all named caches using a circular iterator to maintain a fixed memory footprint. SHADOW: Since… | — |
| app_invariants__f46edd2dd5c9fd25 | INVARIANT: Foreign key join responses must encapsulate the hash of the original primary-side value to detect and discard stale join results caused by rapid primary-key updates. SHADOW: Because FK… | — |
| app_invariants__5ecb051404c8a3fe | INVARIANT: Segmented stores must automatically purge data segments whose maximum timestamp is older than the current stream time minus the retention period. SHADOW: This is the 'physics' of windowed… | — |
| app_invariants__bb039c903ff38a31 | INVARIANT: Task-Shard Isolation Exclusivity SHADOW: Sharing a state store shard across sibling tasks or different transformer instances triggers immediate data corruption. The system enforces a… | — |
| app_invariants__dc834d2c061e98a2 | INVARIANT: Active Task Singleton Enforcement SHADOW: A specific Task ID must never be assigned as ACTIVE to more than one client simultaneously. Validation logic in the assignment phase prevents… | — |
| app_invariants__e62489265fe07ecb | INVARIANT: Restoration Callback Non-Blocking Invariant SHADOW: State restoration batching requires minimal processing latency within listener callbacks. Heavy logic in 'onBatchRestored' creates… | — |
| app_invariants__a72a6b6ad33a0130 | INVARIANT: File-System Level Process Locking SHADOW: Persistence directories are guarded by physical file locks (.lock). This neutralizing race conditions where multiple Kafka Streams instances on… | — |
| app_invariants__097467a9e3596bce | INVARIANT: Punctuation Re-entrancy Suppression SHADOW: Punctuation schedules (STREAM_TIME or WALL_CLOCK_TIME) must skip missed intervals if the previous iteration hasn't completed or if time jumps… | — |
| app_invariants__ae5d5bc831e577e0 | INVARIANT: Co-partitioning Symmetry Constraint SHADOW: Joined source topics must strictly share identical partition counts. If partition counts diverge, the topology builder must fail immediately to… | — |
| app_invariants__2c899f6b70879d25 | INVARIANT: Standby Task Monotonic Update Invariant SHADOW: Standby tasks only advance state via changelog consumption and are forbidden from committing offsets. They exist in a perpetual 'RESTORING'… | — |
| app_invariants__726786750e280e6e | INVARIANT: Checkpoint-Flush Order Atomicity SHADOW: Local state checkpoints must only be written AFTER a successful flush of the state store and potential producer commit. Writing a checkpoint for… | — |
| app_invariants__eee90170fdf1f4e1 | INVARIANT: The foundational record context (timestamp, offset, topic, partition, headers) once constructed, MUST remain immutable throughout its processing pipeline within a ProcessorRecordContext… | — |
| app_invariants__b5feea3ef7adfb14 | INVARIANT: All read and write operations to the shared collections of active, standby, paused, restored, and pending tasks MUST be protected by explicit locks and condition variables. SHADOW: This… | — |
| app_invariants__daa45a380698e6bf | INVARIANT: All asynchronous exceptions originating from producer callbacks or other background operations MUST be captured atomically and subsequently re-thrown in the main processing thread or… | — |
| app_invariants__922469544f8a7b85 | INVARIANT: The StreamThread MUST adhere to a strictly defined finite state machine for its lifecycle, ensuring that transitions between states are explicit, validated, and prevent illegal… | — |
| app_invariants__242106f16e331ca8 | INVARIANT: For tasks operating with Exactly-Once Semantics (EOS), the local state checkpoint file MUST be explicitly deleted upon task resume() operation. SHADOW: This deletion prevents the… | — |
| app_invariants__4ac278eeb8d7f9fa | INVARIANT: During task assignment, each input topic partition MUST be assigned to exactly one active task, and all source topic partitions for a given topology MUST be accounted for. SHADOW: This… | — |
| app_invariants__9e51d257201a0208 | INVARIANT: During a cooperative rebalance, an active task whose ownership is changing to another consumer instance MUST NOT be immediately reassigned to its new owner if it is still owned by the old… | — |
| app_invariants__9aa42d7e66b17d39 | INVARIANT: Any operation involving simultaneous access or modification of multiple shared task queues across different contexts MUST acquire locks in a consistent, predefined order to prevent… | — |
| app_invariants__b947dc598929712f | INVARIANT: Each input topic partition's record queue MUST enforce a maximum buffered size, and exceeding this limit MUST trigger a pause in consumer polling for that specific partition. SHADOW: This… | — |
| app_invariants__28f073ff403b5acf | INVARIANT: During task shutdown or failure, all registered state stores MUST be closed, flushed, and their underlying resources released, with proper exception handling to ensure that all stores are… | — |
| app_invariants__3524986fab861822 | INVARIANT: Global State Management must occur within a single-instance lock scope per application identity. SHADOW: Global state consistency in distributed stream processing relies on serialized… | — |