incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jeffrey Kesselman <jef...@gmail.com>
Subject Re: What does a write lock ?
Date Thu, 07 Jul 2011 19:24:27 GMT
This has me more confused.

Does this mean that ALL rows on a given node are only updated sequentially,
never  in parallel?

On Thu, Jul 7, 2011 at 3:21 PM, Yang <teddyyyy123@gmail.com> wrote:

> just to add onto what jonathan said
>
> the columns are immutable   .   if u overwrite/ reconcile  a new obj is
> created and shoved into the memtable
>
> there is a shared lock  for all writes though which guard against an
> exclusive lock on memtable switching/flushing
> On Jul 7, 2011 7:51 AM, "A J" <s5alye@gmail.com> wrote:
> > Does a write lock:
> > 1. Just the columns in question for the specific row in question ?
> > 2. The full row in question ?
> > 3. The full CF ?
> >
> > I doubt read does any locks.
> >
> > Thanks.
>



-- 
It's always darkest just before you are eaten by a grue.

Mime
View raw message