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Posted to user@cassandra.apache.org by Steffen Winther <ca...@siimnet.dk> on 2015/03/05 00:28:09 UTC
Howto remove currently assigned data directory from 2.0.12 nodes
HI
Got a cassandra cluster 2.0.12 with three nodes,
that I would like to reduce storage capacity as I
would like to reuse some disks for a PoC
cassandra 1.2.15 cluster on the same nodes.
Howto remove already assigned
data file directories from running nodes?
f.ex. got:
data_file_directories : [ /data1, /data2, /data3, /data4]
which I would like to reduce to:
data_file_directories : [ /data1, /data2]
I would still off course have free storage in this cluster :)
TIA
Re: Howto remove currently assigned data directory from 2.0.12 nodes
Posted by Robert Coli <rc...@eventbrite.com>.
On Wed, Mar 4, 2015 at 6:12 PM, Steffen Winther <ca...@siimnet.dk>
wrote:
> Robert Coli <rcoli <at> eventbrite.com> writes:
>
> >
> > 1) stop node
> > 2) move sstables from no-longer-data-directories into
> still-data-directories
>
> Okay, just into any other random data dir?
> Few files here and there to spread amount of data between still-data-dirs?
Yep, that's more or less what JBOD allocation tries to do, heh.
> What about rebalancing amount of data among nodes or doesn't this matter?
Your node isn't losing any data, it's just storing the same data in fewer
directories. I'm not sure what rebalancing among nodes could be required in
this case?
=Rob
Re: Howto remove currently assigned data directory from 2.0.12 nodes
Posted by Steffen Winther <ca...@siimnet.dk>.
Robert Coli <rcoli <at> eventbrite.com> writes:
>
> 1) stop node
> 2) move sstables from no-longer-data-directories into still-data-directories
Okay, just into any other random data dir?
Few files here and there to spread amount of data between still-data-dirs?
> 3) modify conf file
> 4) start node
>
> I wonder how pending compactions are handled in this case;
>potential edge case problem.
>Try it and see.
What about rebalancing amount of data among nodes
or doesn't this matter?
Re: Howto remove currently assigned data directory from 2.0.12 nodes
Posted by Robert Coli <rc...@eventbrite.com>.
On Wed, Mar 4, 2015 at 3:28 PM, Steffen Winther <ca...@siimnet.dk>
wrote:
> Howto remove already assigned
> data file directories from running nodes?
>
1) stop node
2) move sstables from no-longer-data-directories into still-data-directories
3) modify conf file
4) start node
I wonder how pending compactions are handled in this case; potential edge
case problem. Try it and see.
=Rob
http://twitter.com/rcolidba