commit | 489147f3c905784a5fc99e478d5d6c127ecf59ca | [log] [tgz] |
---|---|---|
author | Antonio Barone <syntonyze@gmail.com> | Fri Jul 26 13:16:34 2019 +0100 |
committer | Antonio Barone <syntonyze@gmail.com> | Tue Aug 13 14:44:07 2019 +0100 |
tree | 1bf29cf17b1f7aa2dc73b311812c45c1c7d4e3cd | |
parent | acaaf71cd46c3da0beaf05b53db53bcc28650990 [diff] |
Log blob updates in sharedref_log Not every ref update is a commit, some refs in gerrit are actually pointers to blob objects instead. This is the case for refs/sequences/changes for example. Before this change, updates of blob objects were not recorded in the sharedref_log file: now they are recorded as UPDATE_REF. Note that, because these are not commits, the committer and commit message will not be present in the log. For example: { "ref_name":"refs/sequences/changes", "old_id":"56a6051ca2b02b04ef92d5150c9ef600403cb1de", "new_id":"b5045cc4046dbc1d7cafa4c603fd3cdf35dc5dde", "project_name":"All-Projects", "type":"UPDATE_REF" } Bug: Issue 11243 Change-Id: I1661489934a46a5160378bddae30a8929bbeb788
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.
Currently, the only mode supported is one primary read/write master and multiple read-only masters but eventually the plan is to support multiple read/write masters. The read/write master is handling any traffic while the read-only masters are serving the Gerrit GUI assets, the HTTP GET REST API and git fetch requests (git-upload-pack). The read-only masters are kept synchronized with the read/write master in order to be always ready to become a read/write master.
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 is built like any other Gerrit plugin 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.
Add the multi-site module to $GERRIT_SITE/etc/gerrit.config
as follows:
[gerrit] installModule = com.googlesource.gerrit.plugins.multisite.Module
Create the $GERRIT_SITE/etc/multi-site.config
on all Gerrit servers with the following basic settings:
[kafka] bootstrapServers = <kafka-host>:<kafka-port> [kafka "publisher"] enabled = true [kafka "subscriber"] enabled = true [ref-database] enabled = true [ref-database "zookeeper"] connectString = "localhost:2181"
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.