Integration / Apache Pulsar Interview questions

What are Pulsar Functions?

Pulsar Functions are a lightweight, serverless-style compute framework built into Pulsar that let you run simple processing logic - a Java, Python, or Go function - directly against messages on a topic without standing up a separate stream-processing cluster.

A function reads from one or more input topics, applies user code to each message, and optionally writes results to an output topic, with Pulsar handling deployment, scaling, and fault tolerance for you.

They suit lightweight transformations, filtering, or enrichment; for complex stateful stream processing at scale, teams typically still reach for a dedicated engine like Flink, but Functions cover a large share of everyday use cases with far less operational overhead.

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Pulsar Functions are best described as: a lightweight built-in compute framework for per-message processing

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a schema registry

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a replacement for BookKeeper

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Pulsar Functions can be written in: Java, Python, or Go

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only shell scripts

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only raw SQL

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More Related questions...

What is AppDynamics? Explain about Apache Pulsar. What is Apache Pulsar? What is a Pulsar broker? What is Application Performance Monitoring (APM)? What is Apache BookKeeper? What are the core components of the AppDynamics platform? What is the Controller in AppDynamics? What are tenants and namespaces in Pulsar? What is an App Agent in AppDynamics? What is a topic in Pulsar? What are the types of agents available in AppDynamics? What is a producer in Pulsar? What is a Business Transaction in AppDynamics? What is a consumer in Pulsar? What is a subscription in Pulsar? What is a Tier in AppDynamics? What is a Node in AppDynamics? Define a partitioned topic in Pulsar? What is Pulsar's metadata store used for? What is a Business Application in AppDynamics? What is the Application Flow Map? What are Pulsar Functions? What is a Health Rule? What is Pulsar IO? Describe geo-replication in Pulsar? What is a Policy in AppDynamics? What is tiered storage in Pulsar? What is a Transaction Snapshot? What is a non-persistent topic in Pulsar? Define baseline in AppDynamics? What is the Machine Agent used for? What are the subscription types in Pulsar? What is End User Monitoring (EUM)? What is message retention in Pulsar? What is Database Visibility in AppDynamics? What is schema registry in Pulsar? List the core components of a Pulsar cluster? What are Backends in AppDynamics? Describe the Metric Browser in AppDynamics? How do you create a topic in Pulsar? What is the difference between a Tier and a Node in AppDynamics? What is the difference between Pulsar and Kafka's storage architecture? How does Pulsar separate compute and storage? How does AppDynamics automatically discover Business Transactions? What is the difference between automatic and custom Business Transaction match rules? Why is Pulsar considered multi-tenant by design? What is the difference between Shared and Exclusive subscriptions? How does AppDynamics correlate a transaction across multiple tiers? Why is the singularityheader important in transaction correlation? How does Key_Shared subscription maintain ordering? How does AppDynamics decide when to capture a transaction snapshot? When should you use Failover subscription instead of Exclusive? What is the difference between a ledger and a segment in BookKeeper? What is dynamic baselining and how does it work? Why does the Java Agent use byte-code instrumentation? How does Pulsar achieve message deduplication? Explain the internal working of AppDynamics' byte-code instrumentation? Why do brokers in Pulsar not store data locally? What happens when a broker crashes in Pulsar? What is a Service Endpoint in AppDynamics? What is an Information Point? How does namespace bundle splitting work? What is a Data Collector in AppDynamics? What is the difference between backlog quota and retention policy? When should you use custom match rules instead of automatic discovery? 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How does the Cluster Agent monitor Kubernetes environments? What is the difference between SaaS and On-Premises Controller deployments? Explain the execution flow of topic ownership failover in Pulsar? How can you optimize BookKeeper storage costs using tiered storage? How can you reduce AppDynamics agent overhead in a production environment? What is Business iQ / Analytics in AppDynamics? Explain the internal working of Pulsar transactions? Which is better for exactly-once processing: idempotent producers or transactions, and why? How does AppDynamics integrate with ITSM tools like ServiceNow or PagerDuty? How do you troubleshoot unbalanced load across brokers? What is the AppDynamics REST API used for? Explain the lifecycle of a namespace bundle from creation to split? Explain the lifecycle of an alert from health rule violation to notification? What is the difference between Warning and Critical health rule severities? How can you optimize consumer throughput with Key_Shared subscriptions? What are Instrumentation exclude rules and why would you use them? Explain the execution flow of a Pulsar Function processing a message? Explain the execution flow of a distributed transaction across microservices in AppDynamics? How do you troubleshoot message duplication in a Pulsar producer?

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