Does it backup whole database and then reload the data after update? or just adds/removes the affected columns and data in those columns?
By convention when you update a system Hybris will look for impex files matching
projectdata*.impex
When you run initializaton Hybris also look for files matching
essentialdata*.impex
So your question your question Hybris will simply reload data, from projectdata files (pattern could be override on your local.properties file)
Run the dryrun and you can see exactly what it will do.
During an update, type system definitions are modified to match the new type system definition in the items.xml files. You can understand what exactly it do by reading This page
Just to elaborate on Ram Tripathi's answer ...
Entire Type System Is Discarded & Re-Created from the Extension - items.xml.
Related
I suppose it runs essentialdata.impex.
I am not sure of the difference.
Any inputs from hybris experts highly appreciated.
Initalization:
Droping old and create new empty system.
Creating schema and type system.
Reloading persistences
Clearing cache.
Initialize media storages.
Setting licence.
Restarting internals.
Clearing hMc configuration from database.
creating essential data.
Localizing types and creating project data.
Updating
Updating schema.
Reloading persistences
Clearing cache.
Initialize media storages
setting licence.
Initialization drops existing type definitions from the database prior to rebuilding, so the entire type system is created from scratch. So during an initialization, type system definitions are created to match the type system definition in the items.xml files.
During an update, type system definitions are modified to match the new type system definition in the items.xml files.
During the initialization and update processes, the platform looks for ImpEx files in the /resources/impex folder. In particular:
For essential data: The platform scans the
/resources/impex folders for files with names that
match the pattern essentialdata*.impex and imports the files during
the essential data creation.
For project data: The platform scans the
/resources/impex folders for files with names that
match the pattern projectdata*.impex and imports the files during the
project data creation.
In Update suppose you have done any change in attribute of items.xml then after update older will remain in table structure and newer will also create (it apply same for column also)
You need to intialize the system, only when you want to build the site from scratch or when you are creating new environemnt. like QA/Staging/Prod.
You will do system update - whenever you are making modifications to *items.xml file. like adding an itemtype or modifying existing item type or changing any restrictions etc..
I ran into my first Core Data versioning problem - learn something every day!
Following instructions found here, I made a new version of the model, added the code for lightweight migration, and then went to set the active version…
Uhhh, where do you do that? The docs don't actually say, and other threads here talk about "click on the main file". WHAT "main file"?
The original xcdatamodel has no version number in it. Is that a problem? Is the Migration Manager still going to be able to figure this out?
All I did was add a field, this seems like a lot of work…
Core Data model files don't use version numbers. The files might include a number in their name, but that's for people to see, Core Data doesn't care about it. It uses entity hashes to compare models.
The "main file" is the .xcdatamodeld that contains all the versions (which have names ending in .xcdatamodel).
Select that then look in the file inspector pane on the right. It has a pop-up menu that you use to select the current version.
How can I store elasticsearch settings+mappings in one file (like schema.xml for Solr)? Currently, when I want to make a change to my mapping, I have to delete my index settings and start again. Am I missing something?
I don't have a large data set as of now. But in preparation for a large amount of data that will be indexed, I'd like to be able to modify the settings and some how reindex without starting completely fresh each time. Is this possible and if so, how?
These are really multiple questions disguised as one. Nevertheless:
How can I store elasticsearch settings+mappings in one file (like schema.xml for Solr)?
First, note, that you don't have to specify mapping for lots of types, such as dates, integers, or even strings (when the default analyzer is OK for you).
You can store settings and mappings in various ways, in ElasticSearch < 1.7:
In the main elasticsearch.yml file
In an index template file
In a separate file with mappings
Currently, when I want to make a change to my mapping, I have to delete my index settings and start again. Am I missing something?
You have to re-index data, when you change mapping for an existing field. Once your documents are indexed, the engine needs to reindex them, to use the new mapping.
Note, that you can update index settings, in specific cases, such as number_of_replicas, "on the fly".
I'd like to be able to modify the settings and some how reindex without starting completely fresh each time. Is this possible and if so, how?
As said: you must reindex your documents, if you want to use a completely new mapping for them.
If you are adding, not changing mapping, you can update mappings, and new documents will pick it up when being indexed.
Since Elasticsearch 2.0:
It is no longer possible to specify mappings in files in the config directory.
Find the documentation link here.
It's also not possible anymore to store index templates within the config location (path.conf) under the templates directory.
The path.conf (/etc/default/elasticsearch by default on Ubuntu) stores now only environment variables including heap size, file descriptors.
You need to create your templates with curl.
If you are really desperate, you could create your indexes and then backup your data directory and then use this one as your "template" for new Elasticsearch clusters.
Is it possible to use the FileSystemWatcher to find the PID or process name that is changing a file?
Nope, you need a file system filter driver to track changes with such details.
Negative. The only information you will have is the data contained in the FileSystemEventArgs class, documented here.
This means you only get the type of change that was made, as well as the path to the file that was changed.
I have been using SubSonic 2 on several projects before but with the new SubSonic 3 I have implemented in 2 projects. However, my question has always been is if I can change the the output T4 template to generate a class file for each table instead of single ActiveRecord.cs file. I want to use it in a very large project and I can see where is not practical to have 80+ tables in a single file. I prefer to have separate class files.
Would I need to change SubSonic.Core?
If its not possible, please let me know.
Thanks
Why does it matter how many files there are if the code is entirely generated? What practical difference is there?
You can change the templates to output multiple files. No changes would be required to the SubSonic dll, just the T4 Templates.
However, I fail to see how it is worth even just the time to post the question here, much less the time required to actually make those changes.
There is a way to do this, if you rewrite the T4s to follow this example. However, I think there is an issue that may arise when you drop a table, the previously created .cs file for that table will not be removed. I think you would have to further edit the T4 to start by deleting all its previously generated files.