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From Heng Chen <heng.chen.1...@gmail.com>
Subject Re: isolation level of put and scan
Date Tue, 17 Nov 2015 09:10:06 GMT
Oh, it will never happen.

Each put will acquire row lock to guarantee consistency.

2015-11-17 16:20 GMT+08:00 hongbin ma <mahongbin@apache.org>:

> 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 <mahongbin@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
>

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