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From shimi <shim...@gmail.com>
Subject Re: Tombstones and memtable_operations
Date Tue, 19 Apr 2011 20:33:34 GMT
You can use memtable_flush_after_mins instead of the cron

Shimi

2011/4/19 Héctor Izquierdo Seliva <izquierdo@strands.com>

>
> El mié, 20-04-2011 a las 08:16 +1200, aaron morton escribió:
> > I think their may be an issue here, we are counting the number of columns
> in the operation. When deleting an entire row we do not have a column count.
> >
> > Can you let us know what version you are using and how you are doing the
> delete ?
> >
> > Thanks
> > Aaron
> >
>
> I'm using 0.7.4. I have a file with all the row keys I have to delete
> (around 100 million) and I just go through the file and issue deletes
> through pelops.
>
> Should I manually issue flushes with a cron every x time?
>
> > On 20 Apr 2011, at 04:21, Héctor Izquierdo Seliva wrote:
> >
> > > Ok, I've read about gc grace seconds, but i'm not sure I understand it
> > > fully. Untill gc grace seconds have passed, and there is a compaction,
> > > the tombstones live in memory? I have to delete 100 million rows and my
> > > insert rate is very low, so I don't have a lot of compactions. What
> > > should I do in this case? Lower the major compaction threshold and
> > > memtable_operations to some very low number?
> > >
> > > Thanks
> > >
> > > El mar, 19-04-2011 a las 17:36 +0200, Héctor Izquierdo Seliva escribió:
> > >> Hi everyone. I've configured in one of my column families
> > >> memtable_operations = 0.02 and started deleting keys. I have already
> > >> deleted 54k, but there hasn't been any flush of the memtable. Memory
> > >> keeps pilling up and eventually nodes start to do stop-the-world GCs.
> Is
> > >> this the way this is supposed to work or have I done something wrong?
> > >>
> > >> Thanks!
> > >>
> > >
> > >
> >
>
>
>

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