I have solr cloud 4.4 set up with two shard and 0 replicas. How can I rename the collection after it is created.
These are from my academic understanding, first try on a test installation before you do these in much serious environments:
One options is to rename solr directoy name and auto discovery (core.properties) name as
name=collection1
For example rename collection1 to mycollection and edit core.properties as
name=mycollection
and restart your server.
Another option is to use collection aliasing:
http://host:port/solr/admin/collections?action=CREATEALIAS&name=newname&collections=oldnme
This is meant for advance use but you can try this.
Let us know your findings and if this answer helped you.
Related
So a friend of mine asked me to help him configure an automatic replication of a table on his MariaDB database to another table that's supposed to be an exact copy of the source/primary table.
The databases are on the same server. MariaDB version 10.2.44. The databases are on a cPanel managed webserver run by a webhost. We are accessing the databases using HeidiSQL, which is what I'm hoping I can use to configure everything.
Upon lots of googling, this is the article I suspect makes the most sense for what we want to do, but it doesn't look like this is automatic to any extent: https://mariadb.com/kb/en/setting-up-replication/
Is this the best way to do what we're trying to do? Is there a better way? Any suggestions?
Thanks!
Like #ysth said, in this case, triggers can be used.
When creating a trigger that "works between different databases", you need to specify the database on the trigger name. So for example:
CREATE TRIGGER database_name.trigger_name
Otherwise you'll get an "Out of schema" error.
The database you need to specify is the one where the "listener" is located. Basically, the place where the condition for the trigger is being checked.
I am using solr-5.4.0 in my production environment(solr cloud mode) and am trying to automate the reload/restart process of the solr collections based on certain specific conditions.
I noticed that on solr reload the thread count increases a lot there by resulting in increased latencies. So I read about reload process and came to know that while reloading
1) Solr creates a new core internally and then assigns this core same name as the old core. Is this correct?
2) If above is true then does solr actually create a new index internally on reload?
3) If so then restart sounds much better than reload, or is there any better way to upload new configs on solr?
4) Can you point me to any docs that can give me more details about this?
Any help would be appreciated, Thank you.
If I'm not wrong you wanted to restart/reload the collection in production (Solr cloud mode) and asking for the best approach, If that's true here are few points for the consideration-
If possible, Could you please provide more details like what it cause/requirement to reload/restart the collection in production
I’m assuming the reason could be to refresh the shared resource (Like to see the changes of updated synonyms, or adding or deleting a stop word, etc.) or to update the Solr config set.
Here are a few points for the consideration-
If you want to update the shared resources –
Upload the resources through Solr API and reload the collection through (https://lucene.apache.org/solr/guide/6_6/collections-api.html#CollectionsAPI-Input.1)
If you want to update the config set –
When running in SolrCloud mode, changes made to the schema on one node will propagate to all replicas in the collection. You can pass the updateTimeoutSecs parameter with your request to set the number of seconds to wait until all models confirm they applied the schema updates. ( I got this information from solr-5.4.0, and it’s similar to what we have in Solr 6.6 here https://lucene.apache.org/solr/guide/6_6/schema-api.html)
1) Solr creates a new core internally and then assigns this same core name as the old core. Is this correct?
Not sure about it. Can you please share some reference?
2) If above is true then does solr create a new index internally on reload?
Not sure about it. Can you please share some reference?
3) If so then restart sounds much better than reload, or is there any better way to upload new configs on solr?
I don’t agree, because ideally reload is part of the restart, as per my understanding there will be an additional process in reset related to caching and sync.
4) Can you point me to any docs that can give me more details about this?
Here is a link for reference guide- https://archive.apache.org/dist/lucene/solr/ref-guide/apache-solr-ref-guide-5.4.pdf
I have been running a OpenLdap N-Way Structure with two Master Nodes. This configuration have been running for some months whitout any problem. https://www.openldap.org/doc/admin24/replication.html
Now, I need to add a third node. The strange behavior is that, when I add this third node (clean Database), It starts to delete the entries of the others two nodes.
Seems that the "clean database" is getting replicated to the other servers, deleting several entries. It is creating a lot of problems even, to restore the backups.
I am looking for the best practice/way to add a completely new node in this environment that already is running, without losing data.
Also, is there some official documentation about the best way to Backup this environment?
Any information is welcome.
Thank you,
I'd like to make it so that a commit to our BitBucket repo (or S3 Bucket) automatically deploys code (using CodeDeploy) to our EC2 instances. I'm not clear what to use for the 'source' and 'destination' entry under the 'files' section in the appspec.yml file and also I am not cleared what to mention in BeforeInstall and AfterInstall under 'Hooks' section. I've found some examples on Google and AWs documentation but I am confused what to mention in above fields. The more I am exploring more I am getting confused.
Consider I am new to AWS Code Deploy.
Also it will be very helpful if someone can provide me step y step link how to configure and how to automate the CodeDeploy.
I was wondering if someone could help me out?
Thanks in advance for your help!
Thanks for using CodeDeploy. For new users, I'd like to recommend the following things to do:
Try to run First Run Wizard on console, it will should you the general process how the deployment goes. It also provide a default deployment bundle, also an appspec file included.
Once you want to try a deployment yourself, the Get Started doc is a great place to help you with some pre-requiste settings like IAM role
Then probably try some tutorials for a sample app too, which gives you some idea about deployment groups, deployment configuration, revision and so on.
The next step should be create a bundle for your own use cases, Appspec file doc would be a great place to refer. And for your concerns about BeforeInstall and AfterInstall, if your application doesn't need to do anything, the lifecycle events can be left as empty. BeforeInstall can be used to for for preinstall tasks, such as decrypting files and creating a backup of the current version, while AfterInstall can be used for tasks such as configuring your application or changing file permissions.
Now it comes to the fun part! This blog talks about details about how to integrate with Github(similar for Bitbucket). It's a little long, but really useful, and it also includes how to do automatically deployment once there is a new pushed commit. Currently Jenkins and CodePipline are really popular for auto-triggered deplyoments, but there are always a lot of other ways can achieve the same purpose like Lamda and so on
I am creating web service in zend framework which uses DynamoDB. So I installed DynamoDB in local. But it's not easy to use. Even for inserting data and update any data for testing for purpose I have to write a script.
Is there any DynamoDB client available for MAC ? In which we can insert/update/delete data from UI.
EDIT
Doubts
1) Do I have to run a SQL to see table data? I thought there would be GUI for this.
2) I am not able to use where clause in SQL. What if I want to see one or two records from all? Is there a way to use conditions in this?
3) All fields of a row is not visible and I am not able to scroll it horizontally ?
YES! I've finally found a solution after struggling with this myself:
Run your local dynamodb jar with the following command java -jar DynamoDBLocal.jar -dbPath . [this will create a file in whatever directory the Dynamo jar is located in].
Download SQLite Database Browser and extract/install it.
Start SQLite Database Browser
Navigate to "Open Database" from the file menu
Navigate to the directory from 1. Select the file [in this case, ****_us-east-1]
You should then see the database contents!!
Hope this helps - it's been frustrating me no end!
!! EDIT !! - in response to original question edit.
Doubts
1) Do I have to run a SQL to see table data? I thought there would be
GUI for this.
2) I am not able to use where clause in SQL. What if I want to see one
or two records from all? Is there a way to use conditions in this?
3) All fields of a row is not visible and I am not able to scroll it
horizontally ?
Yes - you can do a simple "select" statement, for instance in my examples: "SELECT * FROM tweet_item" returns me the following screenshot:
Seemingly inadvertanyl - whilst I couldn't get the direct SELECT * FROM XX WHERE XX to work, the like statement does. For instance SELECT * FROM tweet_item where tweet_item.hashKey like "%425665354447462400%" returns me the tweet with tweet_id [my hashKey] of 425665354447462400:
Strange - I seem to be able to scroll quite happily [although it is Windows not Mac]. It also automatically tries to re-size the outer frame, too.
I ran into this problem and found a relatively new solution : https://github.com/aaronshaf/dynamodb-admin
It has provision for GET/POST/PUT/DELETE.
Although its a paid product, which is a bummer, RazorSQL now supports DynamoDB as well, and does let you change the AWS endpoint to point to a local installation.
The mac version (with a free trial) is available here:
http://razorsql.com/download_mac.html
Here is a very useful ui tool https://github.com/YoyaTeam/dynamodb-manager，It supports almost all data operations。
For Eclipse users:
Amazon provides AWS Toolkit for Eclipse IDE. It can view local and cloud databases. Also if you are using different regions, it has ability to choose from different regions.
You can create attributes, add keys etc..
For installation follow this link: http://docs.aws.amazon.com/toolkit-for-eclipse/v1/user-guide/getting-started.html
Dynobase is new DynamoDB GUI Client which also lets you browse and manipulate local DynamoDB instances: https://dynobase.dev/dynamodb-local-admin-gui/
Unfortunately, it's paid but there's free 7-days trial, works on Mac, Windows and Linux: https://dynobase.dev/