commit | 782f8ba624b03fb0ee00dac43e9bde54d89442e3 | [log] [tgz] |
---|---|---|
author | Antonio Barone <syntonyze@gmail.com> | Thu Dec 09 14:33:56 2021 +0100 |
committer | Antonio Barone <syntonyze@gmail.com> | Wed Dec 15 16:48:24 2021 +0100 |
tree | ba6c3557cfb7411535ce7bcebfd7f5c9de76e336 | |
parent | a4638e8cee55159794630988f39fb183a42f6517 [diff] |
Introduce persistent cache for replication-status ReplicationStatus keeps track of the replication lags associated to projects in a multi-site set-up, so that it is possible to understand how much behind a particular project is falling due to replication. This information however is lost upon gerrit restart. Persist replication status information by using a persistent cache to populate in-memory replication-status at startup. Bug: Issue 15310 Change-Id: I86c40684439ec5a457866f56f4cb9157c4af0092
This plugin allows to deploy a distributed cluster of multiple Gerrit masters each using a separate site without sharing any storage. The alignment between the masters happens using the replication plugin and an external message broker.
Requirements for the Gerrit masters are:
NOTE: The multi-site plugin will not start if Gerrit is not yet migrated to NoteDb.
Supports multiple read/write masters across multiple sites across different geographic locations. The Gerrit nodes are kept synchronized between each other using the replication plugin and a global ref-database in order to detect and prevent split-brains.
For more details on the overall multi-site design and roadmap, please refer to the multi-site plugin DESIGN.md document
This plugin is released under the same Apache 2.0 license and copyright holders as of the Gerrit Code Review project.
The multi-site plugin can only be built in tree mode, by cloning Gerrit and the multi-site plugin code, and checking them out on the desired branch.
Example of cloning Gerrit and multi-site for a stable-2.16 build:
git clone -b stable-2.16 https://gerrit.googlesource.com/gerrit git clone -b stable-2.16 https://gerrit.googlesource.com/plugins/multi-site cd gerrit/plugins ln -s ../../multi-site . rm external_plugin_deps.bzl ln -s multi-site/external_plugin_deps.bzl .
Example of building the multi-site plugin:
cd gerrit bazel build plugins/multi-site
The multi-site.jar plugin is generated to bazel-bin/plugins/multi-site/multi-site.jar
.
Example of testing the multi-site plugin:
cd gerrit bazel test plugins/multi-site:multi_site_tests
NOTE: The multi-site tests include also the use of Docker containers for instantiating and using a Kafka/Zookeeper broker. Make sure you have a Docker daemon running (/var/run/docker.sock accessible) or a DOCKER_HOST pointing to a Docker server.
Install the multi-site plugin into the $GERRIT_SITE/lib
directory of all the Gerrit servers that are part of the multi-site cluster. Create a symbolic link from $GERRIT_SITE/lib/multi-site.jar
into the $GERRIT_SITE/plugins
.
Add the multi-site module to $GERRIT_SITE/etc/gerrit.config
as follows:
[gerrit] installDbModule = com.googlesource.gerrit.plugins.multisite.GitModule installModule = com.googlesource.gerrit.plugins.multisite.Module
For more details on the configuration settings, please refer to the multi-site configuration documentation.
You also need to setup the Git-level replication between nodes, for more details please refer to the replication plugin documentation.
For information about available HTTP endpoints please refer to the documentation.