Is it possible to downgrade gerrit from 2.8.6.1 to 2.4.1

[陳煌仁]

I upgrade gerrit successfully  from 2.4.1 to 2.8.6.1 on test server.

However, I am afraid of any problems occur when upgrading gerrit on production server.

Therefore, I wonder to know if there is a way that I can downgrade gerrit from 2.8.6.1 to 2.4.1.

Thanks a lot

Glenn 

[Alex Blewitt]

Take a backup beforehand and then if required restore from that backup. The database schema will change but the repositories should be unaffected though. 

Alex

Sent from my iPhone 5

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[陳煌仁]

When I want to run command: java -jar gerrit-2.4.1.war init -d review_site/

I got the following log

Exception in thread "main" com.google.gwtorm.server.OrmException: Cannot upgrade from schema 84; manually run init from Gerrit Code Review 2.1.7 and restart this version to continue.

at com.google.gerrit.server.schema.Schema_52.upgradeFrom(Schema_52.java:37)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaVersion.upgradeFrom(SchemaVersion.java:86)

at com.google.gerrit.server.schema.SchemaVersion.check(SchemaVersion.java:77)

at com.google.gerrit.server.schema.SchemaUpdater.update(SchemaUpdater.java:64)

at com.google.gerrit.pgm.Init$SiteRun.upgradeSchema(Init.java:181)

at com.google.gerrit.pgm.Init.run(Init.java:79)

at com.google.gerrit.pgm.util.AbstractProgram.main(AbstractProgram.java:67)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at com.google.gerrit.launcher.GerritLauncher.invokeProgram(GerritLauncher.java:167)

at com.google.gerrit.launcher.GerritLauncher.mainImpl(GerritLauncher.java:91)

at com.google.gerrit.launcher.GerritLauncher.main(GerritLauncher.java:49)

at Main.main(Main.java:25)

Should I readlly do downgrade to 2.1.7 first, and upgrade to 2.4.1?

AlBlue於 2014年8月30日星期六UTC+8下午2時38分40秒寫道：

[Alex Blewitt]

Restore the database from the backup you took before migrating from 2.4.1. 

Alex

Sent from my iPhone 5

[陳煌仁]

Dear AIBlue

Can you describe this in detailed?

The schema of 2.4.1 and 2.8.6.1 are different.

Thanks a lot

Glenn

AlBlue於 2014年8月31日星期日UTC+8下午11時58分32秒寫道：

[Alex Blewitt]

Using the backup that you took of the database before the upgrade, use your database tools to restore to that backup. 

Alex 

Sent from my iPhone 5

[Glenn Chen]

Dear AIBlue

Do you mean I can backup the database reviewdb to reviewdb_backup?

And run init command to upgrade gerrit.

If any problem occur, restore database from reviewdb_backup.

Is it right?

Thanks a lot

Glenn

AlBlue於 2014年9月1日星期一UTC+8下午2時34分49秒寫道：

[Alex Blewitt]

Yes, that is the process. 

Sent from my iPhone 5

[Glenn Chen]

AIBlue, Thanks a lot!!!

AlBlue於 2014年9月1日星期一UTC+8下午5時38分39秒寫道：