Hi
We have actually tested this and found that the following will do it
* Shutdown all Solr nodes - make sure ZKs are still running
* For each replica (shard-instance) move its data-folder to the new
server (if they are not already available to it through some shared storage)
* For each repilca (shard-instance) also move solr.xmls
* Extract clusterstate.json from ZK into a file. Modify that file so
that hosts/IPs and ports are correct according to new setup. Replace
clusterstate.json in ZK with the modified content of the
clusterstate.json file
* Start new Solr nodes
Good luck!
Regards, Per Steffensen
On 1/26/13 6:56 AM, Mingfeng Yang wrote:
Hi Mark,
When I did testing with SolrCloud, I found the following.
1. I started 4 shards on the same host on port 8983, 8973, 8963, and 8953.
2. Index some data.
3. Shutdown all 4 shards.
4. Started 4 shards again, all pointing to the same data directory and use
the same configuration, except that now we use different ports 8983, 8973,
7633 and 7648.
5. Now Solr has problem to load all cores properly.
Therefore, I had the impression that ZooKeeper may have a memory of which
hosts correspond to which shards. If I change the host info, it may get
confused. I could not find any related documentation or discussion about
this issue.
Thanks,
Ming
On Fri, Jan 25, 2013 at 5:52 PM, Mark Miller <markrmil...@gmail.com> wrote:
You could do it that way.
I'm not sure why you are worried about the leaders. That shouldn't matter.
You could also start up new Solrs on the new machines as replicas of the
cores you want to move - then once they are active, unload the cores on the
old machine, stop the Solr instances and remove the stuff left on the
filesystem.
- Mark
On Jan 25, 2013, at 7:42 PM, Mingfeng Yang <mfy...@wisewindow.com> wrote:
Right now I have an index with four shards on a single EC2 server, each
running on different ports. Now I'd like to migrate three shards
to independent servers.
What should I do to safely accomplish this process?
Can I just
1. shutdown all four solr instances.
2. copy three shards (indexes) to different servers.
3. launch 4 solr instances on 4 different servers, each with -zKhost
specified, pointing to the zookeeper servers.
In my impression, zookeeper remembers which shards are leaders. What I
plan to do above could not elect the three new servers as leaders. If
so,
what's the correct way to do it?
Thanks,
Ming
