Hi,
even if recovery like a dead node would work - backup and restore (like
my way with an usb docking station) will be much faster and produce less
IO and CPU impact on your cluster.
Keep that in Mind :-)
Cheers,
Jan
Am 22.12.2014 um 10:58 schrieb Or Sher:
Great. replace_address works great.
From some reason I thought it won't work with the same IP.
On Sun, Dec 21, 2014 at 5:14 PM, Ryan Svihla <rsvi...@datastax.com
<mailto:rsvi...@datastax.com>> wrote:
Cassandra is designed to rebuild a node from other nodes, whether
a node is dead by your hand because you killed it or fate is
irrelevant, the process is the same, a "new node" can be the same
hostname and ip or it can have totally different ones.
On Sun, Dec 21, 2014 at 6:01 AM, Or Sher <or.sh...@gmail.com
<mailto:or.sh...@gmail.com>> wrote:
If I'll use the replace_address parameter with the same IP
address, would that do the job?
On Sun, Dec 21, 2014 at 11:20 AM, Or Sher <or.sh...@gmail.com
<mailto:or.sh...@gmail.com>> wrote:
What I want to do is kind of replacing a dead node -
http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_replace_node_t.html
But replacing it with a clean node with the same IP and
hostname.
On Sun, Dec 21, 2014 at 9:53 AM, Or Sher
<or.sh...@gmail.com <mailto:or.sh...@gmail.com>> wrote:
Thanks guys.
I have to replace all data disks, so I don't have
another large enough local disk to move the data to.
If I'll have no choice, I will backup the data before
on some other node or something, but I'd like to avoid it.
I would really love letting Cassandra do it thing and
rebuild itself.
Did anybody handled such cases that way (Letting
Cassandra rebuild it's data?)
Although there are no documented procedure for it, It
should be possible right?
On Fri, Dec 19, 2014 at 8:41 AM, Jan Kesten
<j.kes...@enercast.de <mailto:j.kes...@enercast.de>>
wrote:
Hi Or,
I did some sort of this a while ago. If your
machines do have a free disk slot - just put
another disk there and use it as another
data_file_directory.
If not - as in my case:
- grab an usb dock for disks
- put the new one in there, plug in, format, mount
to /mnt etc.
- I did an online rsync from
/var/lib/cassandra/data to /mnt
- after that, bring cassandra down
- do another rsync from /var/lib/cassandra/data to
/mnt (should be faster, as sstables do not change,
minimizes downtime)
- if you need adjust /etc/fstab if needed
- shutdown the node
- swap disks
- power on the node
- everything should be fine ;-)
Of course you will need a replication factor > 1
for this to work ;-)
Just my 2 cents,
Jan
rsync the full contents there,
Am 18.12.2014 um 16:17 schrieb Or Sher:
Hi all,
We have a situation where some of our nodes
have smaller disks and we would like to align
all nodes by replacing the smaller disks to
bigger ones without replacing nodes.
We don't have enough space to put data on /
disk and copy it back to the bigger disks so
we would like to rebuild the nodes data from
other replicas.
What do you think should be the procedure here?
I'm guessing it should be something like this
but I'm pretty sure it's not enough.
1. shutdown C* node and server.
2. replace disks + create the same vg lv etc.
3. start C* (Normally?)
4. nodetool repair/rebuild?
*I think I might get some consistency issues
for use cases relying on Quorum reads and
writes for strong consistency.
What do you say?
Another question is (and I know it depends on
many factors but I'd like to hear an
experienced estimation): How much time would
take to rebuild a 250G data node?
Thanks in advance,
Or.
--
Or Sher
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Or Sher
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Or Sher
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Or Sher
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