i found a good article https://blogs.apache.org/hbase/entry/apache_hbase_internals_locking_and which seems to have answered my question.
so the my described scenario will NEVER happen no matter whether A and B are in same column family? please kindly confirm thanks On Tue, Nov 17, 2015 at 4:07 PM, hongbin ma <mahong...@apache.org> wrote: > hi,experts: > > i have two concurrent threads to read/write same the same htable row. > this row has two columns A and B. > > Currently this rows value is (A:a1, B:b1) > thread 1 wants to read the value of this row's column value for A, B > and thread 2 wants to update this row to (A:a2, B:b2) > > if thread 1,2 happens at the same time, is it possible that thread 1 gets > (A:a1 B:b2) or (A:a2 B:b1) ? > > I'm asking this because this document > https://hbase.apache.org/acid-semantics.html describes hbase's isolation > level as "read committed", and "read committed" may not prevent the above > scenario. > > Will the answer vary if A,B are of the same column family or not? > and will checkAndPut help here? > > thanks in advance. > > -- > Regards, > > *Bin Mahone | 马洪宾* > Apache Kylin: http://kylin.io > Github: https://github.com/binmahone > -- Regards, *Bin Mahone | 马洪宾* Apache Kylin: http://kylin.io Github: https://github.com/binmahone
