Hi, Thanks for replying.
I have kept an eye on the Cassandra logs as well as my app server logs, and I didn't notice any unusual hector/casandra messages there. Where can I configure to see cassandra logs in debug mode? I am pretty sure I haven't touched the 500 mutations in a batch yet. What could be other possibilities for it hanging? It's happening absolutely consistently. rgds, Roshan On Fri, Feb 18, 2011 at 1:50 AM, Nate McCall <n...@datastax.com> wrote: > It is fine to use multiple coumn families via batch_mutate. The size > of the batch itself will take some tunning. In what you are describing > below, it will help watch the cassandra logs in debug mode to diagnose > the issue. > > In general though, I think a good rule with batch_mutate is to start > with 500 mutations (regardless of column families) and go up > incrementally from there watching the logs and ideally memory > consumption as you go. > > On Thu, Feb 17, 2011 at 2:11 PM, Roshan Dawrani <roshandawr...@gmail.com> > wrote: > > Hi, > > Is it ok to update / insert into multiple column families (some regular, > > some related super column families) using in one batch? > > > > I earlier had a few separates mutator.execute() calls hitting these CFs, > but > > I am trying to merge them into a bigger batch. > > The issue I am facing is that the smaller batches used to get executed > > perfectly, but with the combined one, the updates just hang ! > > I am not pin-pointing the issue anywhere at this time. I just want to > know > > if it is normal to update multiple CFs in a batch and if there is > deadlock > > situation that may arise if that is done. > > -- > > Roshan > > Blog: http://roshandawrani.wordpress.com/ > > Twitter: @roshandawrani > > Skype: roshandawrani > > > > >
