solr
Now i am using solr4. I need to migrate solr to latest version.
Which solr version is latest and stable?
What are the conditions i need to check for migration?
How can i merge this version to latest version?
Which version can u prefer for me?
any migration tool is available for this migration?
I think about solr 6.3.0
Is it stable ?
What are the manger difference in solr 4 and 6 ??
When upgrading you really have to choices:
Reindex. This is the easiest (and you should have a way to reindex on request anyway, but some use cases makes reindexing hard, since Solr could be your primary datastore), most flexible and gives you the best end result.
Do a version-by-version upgrade, going from each version that supports the old index format to the most recent version that supports that format, then repeat until you're on your target version of Solr. Since old index versions are usually readable through each main version tree (I think), you'll have to go 4 -> 5 -> 6. You can use the IndexUpgrader tool to help with this, and as you can see at the bottom of that page, Jan made a tool that automates 4 -> 5 -> 6 for you.
The differences are far too many to really list, please refer to the Changelog for each release. In particular there's a world of difference regarding cloud / cluster support between 4.x and 6.x, and there's a lot of new features, such as streaming expressions.
Upgrading the schema is a matter of going through the datatypes you're using and checking if they've changed definitions (ints vs tries, for example). You'll probably be OK with just minor changes. The default schema factory has changed from the classic index schema to the managed schema, so if you want to keep editing the schema.xml as you're used to, you'll have to change to the ClassicIndexSchemaFactory in your configuration.
Related
Looking into upgrading our solar instance from version 5 to version 8.
I worked through the index upgrading tools but it doesn’t allow upgrading an index create before version 7 into version 8.
Exception in thread "main"
org.apache.lucene.index.IndexFormatTooOldException: Format version is
not supported (resource
BufferedChecksumIndexInput(MMapIndexInput(path="/var/solr/data/solr5_restore_test/data/snapshot.collection1.20201230023602/segments_4ya8s"))):
This index was initially created with Lucene 6.x while the current
version is 8.6.1 and Lucene only supports reading the current and
previous major versions.. This version of Lucene only supports indexes
created with release 7.0 and later.
I was wondering if there were any alternatives or if it would require reindexing everything.
You need to re-index the data with new version of Solr i.e. with version 8.
Its not advisable to upgrade though many versions. Solr supports the index formats of the immediate earlier versions.
Please check if the below tool help you achieve UpdateIndex
With the newer version sometimes, some of the field types are updated or removed.
I would suggest get you your index ready by re-indexing the data with newer version of Solr. Once index is ready you can use it for your application.
We are looking to upgrade from Apache Solr 4.7.2 to ApacheSolr 7.6. The documentation is not very clear.
Please reply with your valuable notes
Thanks in advance
No. As seen on the reference page for the Index Upgrader tool:
Indexes can only be upgraded from the previous major release version to the current major release version.
This means that the IndexUpgrader Tool in any Solr 7.x release, for example, can only work with indexes from 6.x releases, but cannot work with indexes from Solr 5.x or earlier.
If you are currently using an earlier release such as 5.x and want to move more than one major version ahead, you need to first upgrade your indexes to the next major version (6.x), then again to the major version after that (7.x), etc.
There's also an indexupgrader tool that attempts to perform this sequence automagically for you from your current version.
I am trying to setup solr in my project, want to know which is the most stable and tested version of solr available. I want to use mapr filesystem.
Basically, there are two rules for all Solr releases:
They all have a large number of tests to pass before release.
Still, there's some issue with every .0 release, so it's wise to choose the bugfixed .1 even later releases.
Bonus: This applies to every type of file system you want Solr to run on.
Then there is a trade-off between having the latest features and having it around in field use for longer time. Of course, version 3.6 was thoroughly tested in the field, because it's been around for many years. But it's so outdated you should not choose it. The same applies for the 4.x branch.
On the other end, there's the 6.x branch which has many cool new features but is relatively young. So personally, I recommend you to go with the latest release of the 5.x branch. While the 5.0 release had many new features introduced, the work up to the latest released version 5.5.4 had many fixes applied and still gets backports for things that are fixed in the 6.x branch.
I’ve inherited a project that uses a Solr 3.6.0 deployment. (Several
masters and several slaves – I think there are 6 Solr instances in total.)
I’ve been tasked with investigating if upgrading our 3.6.0 deployment will improve performance – there’s a lot of data and things are getting slow, apparently.
I’ve read Apache docs that from 3.6.x to 4.x there were improvements in scalability and performance.
I see that from 4.x to 5.x that Solr is now a standable server and no longer just a WAR running on Tomcat.
ISSUES:
A. Is it worth upgrading to 4.x or 5.x? Will I see a big improvement in performance?
B. Should I got to 4.x or 5.x? Will 4.x be an easier upgrade path since it's just a new WAR file?
C. In a nutshell ... what will the upgrade path look like, what kind of steps am I in for, and how can I avoid trouble?
Any help is GREATLY appreciated!!
It depends.
If stuff runs fine today and you don't need the extra performance or functionality - there is no good reason to touch it. You're so far behind that upgrading will be a large thing anyway. If you need the performance or the functionality, yes. It's worth it. You'll see an increase in performance and you can use a more recent Java version (current trunk of Lucene requires Java8).
If you can't reindex easily, you'll have to go through 4.x to get to 5.x anyway, since the current version of 5.x might not be able to read your current index format. If you can reindex easily, go directly to 5.x. You'll have to deal with the change in how Solr is being run at some time, better do it now when you're doing the breaking upgrade anyways.
Have a backup, replicate the current environment to a experimental server and try the update there. If you can easily reindex, set up 5.x and index to it and see if you can run the application straight from that backend instead (in development, not production). If it works (and you can reindex easily), create a Solr 5.x instance to run in parallel to your current installation, reindex to that and switch over production after confirming that it works in dev.
If you can't reindex, create a development clone of the current core and try to find the upgrade path that is able to upgrade the index files as you're going along. You're going to have to read a bit of documentation and try out different versions to get a proper migration of the index file format going.
Are there any major differences between Solr 3.6 and Solr 4.0 other than new features? Am I safe using my existing queries (those that work in Solr 3.6) inside of Solr 4.0?
Are there any major differences between Solr 3.6 and Solr 4.0 other
than new features?
I find this question weird, least to say. Bug fixes and new features are the whole point of releases!
You can look at the full changelog of the Solr release which is a available here. Don't forget that Solr and Lucene are released in unison so you also need to look for relevant changes in both projects.
Am I safe using my existing queries (those that work in Solr 3.6)
inside of Solr 4.0?
Queries should be fine, but indices - probably not. Quoting javanna from another SO post:
The index format has changed, but Solr will take care of upgrading the
index. That happens automatically once you start Solr with your old
index. But after that the index cannot be read anymore by a previous
Solr/lucene version.
Ideally they should work.
You can probably check the Changes.txt which would give an idea of all the new features, Changes, Bug fixes, Optimization done.
If any things breaks, you can always refer to the Changes to check if any related has been changed.