Hi Cristina: My understanding of HBase is that the isolation level fro read ops is Read Committed. There is only write lock which could protect the data from modifying by other requests but there is no read-lock (it is there but it doesn't have any effect). Since put ops are atomic, it can succeed or fail but not in the middle so clients can only read the data if the write ops succeeds
HTH, Jerry On Fri, Jun 15, 2012 at 7:59 AM, Cristina <[email protected]> wrote: > Hi, > > I have read that Hbase has read committed as isolation level, but I have > some > doubts. > Is it possible to chage this level, for instance to read uncommitted? How > could > I do this? > Another question, Is this isolation level based on locks? I have doubts > because > Hbase has multiversion concurrency control so it may implement read > committed > snapshot or snapshot isolation. > > Thanks, > Cristina > >
