Hi, >> The third is about the hbase shell, which implements an alter command, >> that can change or add or delete a column family,but i remember the column >> family cannot be changed after the table is created. I also want to know >> default max VERSIONs, when i create a table i give the VERSION 2,later i put >> three values for the same row+column and different timestamp, but i can get >> values rather than only two. > > The column family can be changed, not sure what you are referring to. > > Default max versions is 3, the rest of the question is unintelligible.
I think he means he has set Versions to 2 but sees more than those 2. That is because the table has not yet been compacted. Run a major compaction from the shell on that table and it will reduce the versions to the enforced 2. Bottomline is, for a short period of time (but can be hours, the default is < 24hrs), you may see more than the set number of Versions. Think of it in terms of "Max. number of versions to keep". HTH, Lars
