Describe Pravega and Its Storage Architecture DATA-ENGINEERING-OPTIMIZE Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A logistics company uses Pravega to stream GPS location updates from delivery vehicles. A Flink job consumes the stream to calculate real-time routes. The company needs to ensure that the Flink job can replay events from a specific point in the past if a processing error occurs. Which Pravega feature enables this?

   • AAutomatic scaling of segments to increase throughput.
   • BAppend-only writes that prevent any modification of existing events.
   • CStream cuts and retention policies that allow readers to start from a specific position in the stream.
   • DThe low-latency tier's in-memory caching of recent events.
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   How does Pravega ensure data durability?

   • ABy requiring all writes to be acknowledged by every consumer.
   • BBy asynchronously moving data to a durable long-term storage tier.
   • CBy replicating data in memory across multiple nodes.
   • DBy storing data only in the low-latency tier with no backup.
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A gaming company uses Pravega to store player activity logs. They want to minimize storage costs while ensuring that recent logs are available for immediate analysis and older logs are retained for compliance. Which Pravega feature directly supports this requirement?

   • ATiered storage that automatically moves older data from the low-latency tier to a cheaper durable tier.
   • BSegment scaling that increases the number of segments as the stream grows.
   • CReader groups that allow multiple consumers to read the same stream.
   • DAppend-only writes that prevent modification of existing logs.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   In Pravega, what is a segment?

   • AA unit of parallelism and scaling within a stream.
   • BA logical grouping of multiple streams for management purposes.
   • CA fixed-size batch of events that is processed atomically.
   • DA metadata record that describes the schema of a stream.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A financial services firm uses Pravega to ingest trade data. They require low-latency writes for real-time analytics and also need to retain the data for years for regulatory audits. They are concerned about the cost of keeping all data in memory or fast storage. How does Pravega's tiered storage model address this?

   • AAll data is written directly to durable long-term storage to ensure immediate durability, with no separate low-latency tier.
   • BData is kept only in the low-latency tier, and older data is deleted automatically to free space.
   • CRecent data is held in a low-latency tier (e.g., memory or SSD) for fast access, and older data is automatically moved to a durable, long-term storage tier (e.g., HDFS or cloud object storage).
   • DThe low-latency tier is used only for reads, while all writes go directly to long-term storage.
   Reveal Solution Discussion Select an answer first