Apache HBase ™ Reference Guide Apache HBase Team Version 3.0.0-SNAPSHOT Contents Preface. 1 Getting Started. 3 1. Introduction . 4 2. Quick Start - Standalone HBase . 5 Apache HBase Configuration. 17 3. Configuration Files . 18 4. Basic Prerequisites . 20 5. HBase run modes: Standalone and Distributed . 25 6. Running and Confirming Your Installation. 29 7. Default Configuration . 30 8. Example Configurations. 70 9. The Important Configurations . 72 10. Dynamic Configuration . 80 Upgrading. 83 11. HBase version number and compatibility. 84 12. Rollback . 90 13. Upgrade Paths . 94 The Apache HBase Shell . 103 14. Scripting with Ruby . 104 15. Running the Shell in Non-Interactive Mode . 105 16. HBase Shell in OS Scripts. 106 17. Read HBase Shell Commands from a Command File . 108 18. Passing VM Options to the Shell. 110 19. Shell Tricks . 111 Data Model. 117 20. Conceptual View . 118 21. Physical View . 120 22. Namespace . 121 23. Table . 123 24. Row . 124 25. Column Family . 125 26. Cells. 126 27. Data Model Operations . 127 28. Versions . 129 29. Sort Order . 134 30. Column Metadata . 135 31. Joins . 136 32. ACID . 137 HBase and Schema Design . 138 33. Schema Creation . 139 34. Table Schema Rules Of Thumb . 140 RegionServer Sizing Rules of Thumb . 141 35. On the number of column families. 142 36. Rowkey Design . 143 37. Number of Versions . 150 38. Supported Datatypes . 151 39. Joins . 152 40. Time To Live (TTL) . 153 41. Keeping Deleted Cells . 154 42. Secondary Indexes and Alternate Query Paths . 158 43. Constraints . ..