Index: src/docbkx/book.xml =================================================================== --- src/docbkx/book.xml (revision 1089062) +++ src/docbkx/book.xml (working copy) @@ -241,6 +241,15 @@ } +
+ + Number of Versions + + The number of row versions to store is configured per column family via HColumnDescriptor. The default is 3. + This is an important parameter because as described in the Data Model section HBase does not overwrite row values, but rather stores different values per row by time (and qualifier). + Excess versions are removed during major compactions. The number of versions may need to be increased or decreased depending on application needs. + +