HBASE SCHEMA DESIGN - ApacheCon

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HBase Counters • Store counters per Domain and per URL • Leverage HBase increment (atomic read-modifywrite) feature • Each row is one specific Domain or URL • The columns are the counters for specific metrics • Column families are used to group counters by time range • Set time-to-live on CF level to auto-expire counters by age to save space, e.g., 2 weeks on “Daily Counters” family
Key Design • Reversed Domains • Examples: “com.cloudera.www”, “com.cloudera.blog” • Helps keeping pages per site close, as HBase efficiently scans blocks of sorted keys • Domain Row Key = MD5(Reversed Domain) + Reversed Domain • Leading MD5 hash spreads keys randomly across all regions for load balancing reasons • Only hashing the domain groups per site (and per subdomain if needed) • URL Row Key = MD5(Reversed Domain) + Reversed Domain + URL ID • Unique ID per URL already available, make use of it
Page 1 and 2: HBASE SCHEMA DESIGN and Cluster Siz
Page 3 and 4: Agenda • HBase Architecture • S
Page 5 and 6: HBase Tables
Page 7 and 8: HBase Tables
Page 9 and 10: Distribution
Page 11 and 12: HBase Architecture
Page 13 and 14: HBase Architecture (cont.) • Base
Page 15 and 16: Compactions • General Concepts
Page 17 and 18: Region Splits • Triggered by conf
Page 19 and 20: Auto Sharding and Distribution •
Page 21 and 22: Storage Separation • Column Famil
Page 23 and 24: SCHEMA DESIGN
Page 25 and 26: Key Cardinality • The best perfor
Page 27 and 28: Fold, Store, and Shift • Logical
Page 29 and 30: DDI • Stands for Denormalization,
Page 31 and 32: Tall-Narrow vs. Flat-Wide Tables
Page 33 and 34: Partial Key Scans Key - -- --- De
Page 35 and 36: Salting • Prefix row keys to gain
Page 37 and 38: Key Design
Page 39: Example: Facebook Insights • > 20
Page 43 and 44: Summary • Design for Use-Case •
Page 45 and 46: CLUSTER SIZING
Page 47 and 48: Memory Sharing • By default every
Page 49 and 50: Block Cache • Use exported metric
Page 51 and 52: Write Performance • There are man
Page 53 and 54: Write-Ahead Log (cont.) • Size se
Page 55 and 56: Flushes • Every mutation call (pu
Page 57 and 58: Dependencies • Flushes happen acr
Page 59 and 60: Some More Numbers • Under real wo
Page 61 and 62: Cheat Sheet #1 • Ensure you have
Page 63 and 64: Example • Java Xmx heap at 10GB

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