Agreed. Something simple would be better than nothing at all.
On 03/18/2014 02:47 PM, Geert Josten wrote:
A pretty dumb mechanism would already help a lot. Always better to
have at least hosts 2 and 3 act as fail-over, than none.. ;-)
If you want to allow users to change it anyhow, a crude mechanism
would serve as jump start, and basic fail-over..
Cheers
*Van:*[email protected]
[mailto:[email protected]] *Namens *Wayne Feick
*Verzonden:* dinsdag 18 maart 2014 22:27
*Aan:* [email protected]
*Onderwerp:* Re: [MarkLogic Dev General] Failed over Security Database
Hi Geert,
Doing something more intelligent and automatic to improve HA is
something that has come up internally as well, not just for Security,
but also the other auxiliary / default databases. It's something we'd
like to do better on.
There is a little bit of complexity around which hosts handle the
replica forests in different deployment situations. In a private data
center, it might not matter which host handles the replica forests
since all the hosts are in the same rack. For AWS, you want to put
them in a different availability zone.
We added a "zone" descriptor in ML7, and that seems like a good input
for us to use in deciding which hosts should handle the replica
forests. On AWS, it gets set automatically for you. In a private data
center, you'd need to manually set it according to your topology (e.g.
which rack it's in).
Ideally, I'd like these replica forests to just quietly happen when a
cluster is initially formed, and users can adjust to their liking
later if desired.
Wayne.
On 03/18/2014 02:04 PM, Geert Josten wrote:
Yes and no..
By default installation, all hosts start with their own Security
database (, and Modules, and Schemas, and Triggers, and Apps,
etc). But as soon as they join an existing cluster, they seem to
forget they have forests, and databases of their own.
The issue is of course that you cannot have two databases with the
same name, so there is a logical explanation for why it currently
is this way. But I am just wondering whether it is possible to
make it slightly smarter..
I am only thinking about the Security database, just because it is
such a vital database..
Cheers
*Van:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]] *Namens *David Lee
*Verzonden:* dinsdag 18 maart 2014 21:31
*Aan:* MarkLogic Developer Discussion
*Onderwerp:* Re: [MarkLogic Dev General] Failed over Security Database
" Unless someone deliberately messed up, all hosts have a Security
database."
Unless you explicitly set it up differently, the Security database
that all hosts have
in a cluster is *the same database* (A single forest on the first
host installed in the cluster).
**
**
*From:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]] *On Behalf Of
*Geert Josten
*Sent:* Tuesday, March 18, 2014 4:19 PM
*To:* 'MarkLogic Developer Discussion'
*Subject:* Re: [MarkLogic Dev General] Failed over Security Database
Nice.. :)
I'm a little surprised though that Security needs explicit measure
to make it fail over in a cluster. It is pretty vital. Unless
someone deliberately messed up, all hosts have a Security
database. Couldn't it replicate that database across all other
hosts by default, just like all other server configs are being
shared automatically?
Cheers
*Van:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]] *Namens *Danny
Sokolsky
*Verzonden:* dinsdag 18 maart 2014 20:07
*Aan:* MarkLogic Developer Discussion
*Onderwerp:* Re: [MarkLogic Dev General] Failed over Security Database
And as my colleague Dave pointed out to me, if you are using 7,
you can do this same task easier by adding a new forest (with a
public data directory) and retiring the old:
http://docs.marklogic.com/guide/admin/database-rebalancing#id_23094
Similarly, you can use tiered storage to migrate the forest.
-Danny
*From:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]] *On Behalf Of
*Danny Sokolsky
*Sent:* Monday, March 17, 2014 11:01 PM
*To:* MarkLogic Developer Discussion
*Subject:* Re: [MarkLogic Dev General] Failed over Security Database
In order to set up failover on a forest, it must be in a directory
other than the default directory. The default directory
(/opt/MarkLogic/Forests on linux, for example) is known as a
"private directory."
For the procedure to move a forest to a public directory, see this
section of the doc:
http://docs.marklogic.com/guide/cluster/config-both-failover#id_57935
and this section:
http://docs.marklogic.com/guide/cluster/config-both-failover#id_74893
Once you do that, you should be able to set up failover on that
forest.
-Danny
------------------------------------------------------------------------
*From:*[email protected]
<mailto:[email protected]>
[[email protected]
<mailto:[email protected]>] on behalf of
Abhishek53 S [[email protected] <mailto:[email protected]>]
*Sent:* Monday, March 17, 2014 6:04 PM
*To:* MarkLogic Developer Discussion
*Subject:* [MarkLogic Dev General] Failed over Security Database
Hi,
I am trying rename and add forest-failover to the default
"Security" database and getting exception
Invalid input: Failover is not allowed for private forest: Security
Please advise
Abhishek Srivastav
Tata Consultancy Services
Mailto: [email protected] <mailto:[email protected]>
Website: http://www.tcs.com
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