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Distributed caching spreads data across multiple servers for better performance and reliability.

Caching helps applications respond faster by serving data from memory instead of hitting the database.

The Cache-Aside Pattern speeds up data retrieval by using a cache to store frequently accessed data.

Cache eviction policies determine which data to remove when caches are full.

Cache breakdowns can overwhelm databases, but request coalescing solves this issue.

A CDN speeds up web applications by caching content closer to users.

Cache stampede occurs when many requests hit the database due to a cache miss.

Cache invalidation is about knowing when to refresh cached data.

Cache penetration occurs when requests for non-existent data overload the database.

Optimizing Elasticsearch involves using filters, caching, and measuring performance.

Elasticsearch offers three main autocomplete strategies, each with unique benefits and trade-offs.

Redis is a fast in-memory data store used for caching and low-latency applications.

Scaling databases involves deciding whether to enhance read or write capabilities based on traffic patterns.

Deep pagination in Elasticsearch can slow down searches significantly, but there are efficient methods to handle it.

Session-based authentication uses cookies to remember users after login.

Database bottlenecks slow down performance, but identifying them helps optimize and scale effectively.

Kafka uses different strategies to assign partitions to consumers in a group efficiently.

Elasticsearch offers two pagination methods: from & size for shallow pages and search_after for deep pages.

Cascading failures occur when one service's failure impacts others, causing widespread issues.

Late-arriving events can be dropped, updated, or routed based on system needs.

Elasticsearch CCR allows real-time data replication for faster disaster recovery.

Stateless servers are easier to scale because they don't store user session data locally.

Fallbacks allow systems to handle failures safely and maintain user experience.

Keep-Alive allows reusing HTTP connections to improve efficiency and reduce overhead.

Elasticsearch ILM automates index management to reduce storage costs and meet data needs.

Connection pooling reuses database connections but can cause issues if misconfigured.

Kafka consumers can fetch data in batches to improve throughput and reduce latency.

Exponential backoff helps manage retries by increasing wait times to reduce system overload.

Downsampling and aggregation reduce data volume while preserving essential trends.

Search engines collect, index, retrieve, and rank documents to provide relevant results.

DNS helps microservices find each other, but it has limitations that may require a service registry.

Cassandra uses a masterless architecture to distribute and replicate data efficiently.

Token Bucket allows burst traffic, while Leaky Bucket smooths out traffic flow.

Jitter helps spread out client retries to avoid traffic spikes.

Consistent hashing helps distribute data across servers with minimal movement.

Retention policies help manage how long data is kept in databases.

The retry pattern helps systems recover from temporary failures but can cause overload if misused.

Vertical scaling means upgrading one server, while horizontal scaling means adding more servers.

Database indexing speeds up data retrieval by allowing quick lookups.

Optimistic and pessimistic locking are strategies to manage database access during concurrent transactions.

The dual-write trap in Elasticsearch can cause data inconsistency during reindexing.

API pagination helps manage large datasets by breaking them into smaller parts.

A document in Elasticsearch isn't searchable right after it's saved due to the refresh process.

Kafka's `seek()` lets you replay only specific messages, saving time.

Backpressure helps manage message flow in Kafka during traffic spikes.

Change Data Capture allows real-time syncing of database changes to other systems.

Dynamo-style databases are designed for high availability and fault tolerance in distributed systems.

Elasticsearch rescoring improves search result rankings using a two-stage process.

DNS resolution translates a URL into an IP address for web access.

Microservices can communicate using five key patterns based on their needs.

Cassandra uses clustering keys to sort rows within a partition for efficient querying.

CSRF tricks your browser into making requests without your consent.

Kafka uses retry topics and delayed retries to manage message failures efficiently.

Read-after-write consistency ensures users see their latest updates immediately.

Choosing the right distributed lock depends on your system's needs and existing tools.

Dependency failures can disrupt applications, but resilience patterns can help manage them.

The Bulkhead Pattern isolates resources to protect critical workloads from failures.

FAANG engineers use high-level design principles to create scalable systems.

Elasticsearch ILM automates data management through defined lifecycle phases.

Elasticsearch Hybrid Search combines keyword and semantic searches for better results.