Upgrading to ArangoDB 2.2

Please read the following sections if you upgrade from a previous version toArangoDB 2.2.

Please note first that a database directory used with ArangoDB 2.2cannot be used with earlier versions (e.g. ArangoDB 2.1) anymore. Upgrading a database directory cannot be reverted. Thereforeplease make sure to create a full backup of your existing ArangoDBinstallation before performing an upgrade.

Database Directory Version Check and Upgrade

ArangoDB will perform a database version check at startup. When ArangoDB 2.2encounters a database created with earlier versions of ArangoDB, it will refuseto start. This is intentional.

The output will then look like this:

  1. 2014-07-07T22:04:53Z [18675] ERROR In database '_system': Database directory version (2.1) is lower than server version (2.2).
  2. 2014-07-07T22:04:53Z [18675] ERROR In database '_system': ----------------------------------------------------------------------
  3. 2014-07-07T22:04:53Z [18675] ERROR In database '_system': It seems like you have upgraded the ArangoDB binary.
  4. 2014-07-07T22:04:53Z [18675] ERROR In database '_system': If this is what you wanted to do, please restart with the
  5. 2014-07-07T22:04:53Z [18675] ERROR In database '_system':   --upgrade
  6. 2014-07-07T22:04:53Z [18675] ERROR In database '_system': option to upgrade the data in the database directory.
  7. 2014-07-07T22:04:53Z [18675] ERROR In database '_system': Normally you can use the control script to upgrade your database
  8. 2014-07-07T22:04:53Z [18675] ERROR In database '_system':   /etc/init.d/arangodb stop
  9. 2014-07-07T22:04:53Z [18675] ERROR In database '_system':   /etc/init.d/arangodb upgrade
  10. 2014-07-07T22:04:53Z [18675] ERROR In database '_system':   /etc/init.d/arangodb start
  11. 2014-07-07T22:04:53Z [18675] ERROR In database '_system': ----------------------------------------------------------------------
  12. 2014-07-07T22:04:53Z [18675] FATAL Database version check failed for '_system'. Please start the server with the --upgrade option

To make ArangoDB 2.2 start with a database directory created with an earlierArangoDB version, you may need to invoke the upgrade procedure once. This canbe done by running ArangoDB from the command line and supplying the —upgradeoption:

  1. unix> arangod data --upgrade

where data is ArangoDB’s main data directory.

Note: here the same database should be specified that is also specified whenarangod is started regularly. Please do not run the —upgrade command on eachindividual database subfolder (named database-<some number>).

For example, if you regularly start your ArangoDB server with

  1. unix> arangod mydatabasefolder

then running

  1. unix> arangod mydatabasefolder --upgrade

will perform the upgrade for the whole ArangoDB instance, including all of itsdatabases.

Starting with —upgrade will run a database version check and perform anynecessary migrations. As usual, you should create a backup of your databasedirectory before performing the upgrade.

The output should look like this:

  1. 2014-07-07T22:11:30Z [18867] INFO In database '_system': starting upgrade from version 2.1 to 2.2.0
  2. 2014-07-07T22:11:30Z [18867] INFO In database '_system': Found 19 defined task(s), 2 task(s) to run
  3. 2014-07-07T22:11:30Z [18867] INFO In database '_system': upgrade successfully finished
  4. 2014-07-07T22:11:30Z [18867] INFO database upgrade passed

Please check the output the —upgrade run. It may produce errors, which needto be fixed before ArangoDB can be used properly. If no errors are present orthey have been resolved, you can start ArangoDB 2.2 regularly.

Upgrading a cluster planned in the web interface

A cluster of ArangoDB instances has to be upgraded as well. Thisinvolves upgrading all ArangoDB instances in the cluster, as well asrunning the version check on the whole running cluster in the end.

We have tried to make this procedure as painless and convenient for you.We assume that you planned, launched and administrated a cluster using thegraphical front end in your browser. The upgrade procedure is then asfollows:

  • First shut down your cluster using the graphical front end asusual.

  • Then upgrade all dispatcher instances on all machines in yourcluster using the version check as described above and restart them.

  • Now open the cluster dash board in your browser by pointing it tothe same dispatcher that you used to plan and launch the cluster in the graphical front end. In addition to the usual buttons“Relaunch”, “Edit cluster plan” and “Delete cluster plan” you willsee another button marked “Upgrade and relaunch cluster”.

  • Hit this button, your cluster will be upgraded and launched andall is done for you behind the scenes. If all goes well, you willsee the usual cluster dash board after a few seconds. If there is an error, you have to inspect the log files of your clusterArangoDB instances. Please let us know if you run into problems.

There is an alternative way using the ArangoDB shell. Instead ofsteps 3. and 4. above you can launch arangosh, point it to the dispatcherthat you have used to plan and launch the cluster using the option—server.endpoint, and execute

  1. arangosh> require("org/arangodb/cluster").Upgrade("root","");

This upgrades the cluster and launches it, exactly as with the button above in the graphical front end. You have to replace "root" witha user name and "" with a password that is valid for authenticationwith the cluster.