Index: src/docbkx/book.xml =================================================================== --- src/docbkx/book.xml (revision 1160978) +++ src/docbkx/book.xml (working copy) @@ -263,6 +263,21 @@ compactions. The number of versions may need to be increased or decreased depending on application needs. +
+ + Minimum Number of Versions + + Like number of row versions, the minimum number of row versions to keep is configured per column + family via HColumnDescriptor. + The default is 0, which means the feature is disabled. + The minimum number of row versions parameter is used together with the time-to-live parameter and can be combined with the + number of row versions parameter to allow configurations such as + "keep the last T minutes worth of data, at most N versions, but keep at least M versions around" + (where M is the value for minimum number of row versions, M<=N). + This parameter should only be set when time-to-live is enabled for a column family and must be less or equal to the + number of row versions. + +
Immutability of Rowkeys