The data structure in HBase that stores data in sorted order and persists it to disk – HFile

A process that merges multiple HFiles to reduce storage fragmentation and improve read performance – Major Compaction

The mechanism that ensures all writes are first recorded in a durable log before being written to MemStore – Write-Ahead Log (WAL)

The master component responsible for assigning regions to RegionServers and handling failover – HBase Master

A table-level feature in HBase that allows automatic partitioning of data across multiple servers – Region Splitting

The process of migrating a region from one RegionServer to another for better load balancing – Region Rebalancing

Volume: Large amount of existing videos

Velocity: The amount of videos uploaded / watched per min

Variety: The video/comment/reaction/semi-structured data

Veracity: The truthness of the content of the video