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Posted to user@cassandra.apache.org by Aravindan T <ar...@tcs.com> on 2014/02/03 12:25:12 UTC
Query on Seed node
Hi ,
I have a 4 node cassandra cluster with one node marked as seed node. When i checked the data directory of seed node , it has two folders /keyspace/columnfamily.
But sstable db files are not available.the folder is empty.The db files are available in remaining nodes.
I want to know the reason why db files are not created in seed node ?
what will happen if all the nodes in a cluster is marked as seed node ??
Aravindan Thangavelu
Tata Consultancy Services
Mailto: aravindan.t@tcs.com
Website: http://www.tcs.com
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Balance Virtual Nodes
Posted by Augusto Uehara <gu...@gmail.com>.
Dear Cassandra list,
We are experiencing the following distibution of our tokens:
State Address Load Tokens Owns Host ID Rack
UN 10.180.199.188 108.72 GB 263 0.0% f2c84a20-a4b7-4db1-b5bd-95eaf231ac76 RAC1
UN 10.180.206.15 71.86 GB 254 25.0% a13afce3-7e98-4a3b-98d1-5bf6742435a4 RAC1
UN 10.45.163.69 152.23 GB 258 25.0% 90247170-e2bc-43ae-a827-2dcb082e43fc RAC1
UN 10.235.36.125 103.91 GB 248 50.0% 89f362f5-e844-470d-a303-f54e46abc1cb RAC1
our num_tokens is set to 256 and this node started as a regular node and later this was migrated to a virtual node.
We are using the org.apache.cassandra.dht.Murmur3Partitioner.
I've already tried the move and the shuffle nodetool commands after reading a few other posts about this somewhere else, but with no luck.
Can anyone please advice? At this point, our servers don't have enough data that I wouldn't consider creating another cluster, swap the apps to the new cluster and migrate the data using snapshots or scripts, but I think this is a dumb way to do this...
Kind regards,
Augusto
Re: Query on Seed node
Posted by Or Sher <or...@gmail.com>.
I'm guessing its just a coincident.. As far as I know, seeds have nothing
to do with where the data should be located.
I think there could be couple of reasons why you wouldn't see SSTables on a
specific column family folder, these are some of them:
- You're using a few distinct keys which non of them should be on that seed
node.
- Node hasn't flushed yet.. You can use nodetool flush to try and flush
memtables manually.
- You're using manual token assignment and you didn't not assign them well.
On Mon, Feb 3, 2014 at 1:25 PM, Aravindan T <ar...@tcs.com> wrote:
> Hi ,
>
> I have a 4 node cassandra cluster with one node marked as seed node. When
> i checked the data directory of seed node , it has two folders
> /keyspace/columnfamily.
> But sstable db files are not available.the folder is empty.The db files
> are available in remaining nodes.
>
> I want to know the reason why db files are not created in seed node ?
> what will happen if all the nodes in a cluster is marked as seed node ??
>
>
>
> Aravindan Thangavelu
> Tata Consultancy Services
> Mailto: aravindan.t@tcs.com
> Website: http://www.tcs.com
> ____________________________________________
> Experience certainty. IT Services
> Business Solutions
> Consulting
> ____________________________________________
>
> =====-----=====-----=====
> Notice: The information contained in this e-mail
> message and/or attachments to it may contain
> confidential or privileged information. If you are
> not the intended recipient, any dissemination, use,
> review, distribution, printing or copying of the
> information contained in this e-mail message
> and/or attachments to it are strictly prohibited. If
> you have received this communication in error,
> please notify us by reply e-mail or telephone and
> immediately and permanently delete the message
> and any attachments. Thank you
>
>
--
Or Sher