The @PLUGIN@ plugin must be installed on both instances and the following fields should be specified in $site_path/etc/@PLUGIN@.config file:
[main] sharedDirectory = /directory/accessible/from/both/instances [peerInfo] strategy = static [peerInfo "static"] url = target_instance_url [http] user = username password = password
[main] sharedDirectory = /directory/accessible/from/both/instances [peerInfo] strategy = jgroups [peerInfo "jgroups"] myUrl = local_instance_url [jgroups] clusterName = foo skipInterface = lo* skipInterface = eth2 protocolStack = protocolStack.xml [http] user = username password = password [healthcheck] enable = true
main.sharedDirectory : Path to a directory accessible from both master instances. When given as a relative path, then it is resolved against the $SITE_PATH or Gerrit server. For example, if $SITE_PATH is “/gerrit/root” and sharedDirectory is given as “shared/dir” then the real path of the shared directory is “/gerrit/root/shared/dir”. When not specified, the default is “shared”.
peerInfo.strategy : Strategy to find other peers. Supported strategies are static or jgroups. Defaults to static.
static strategy allows to staticly configure the peer gerrit instance using the configuration parameter peerInfo.static.url.jgroups strategy allows that a gerrit instance discovers the peer instance by using JGroups to send multicast messages. In this case the configuration parameters peerInfo.jgroups.* are used to control the sending of the multicast messages. During startup each instance will advertise its address over a JGroups multicast message. JGroups takes care to inform each cluster when a member joins or leaves the cluster.peerInfo.static.url : Specify the URL for the peer instance.
peerInfo.jgroups.myUrl : The URL of this instance to be broadcast to other peers. If not specified, the URL is determined from the httpd.listenUrl in the gerrit.config. If httpd.listenUrl is configured with multiple values, is configured to work with a reverse proxy (i.e. uses proxy-http or proxy-https scheme), or is configured to listen on all local addresses (i.e. using hostname *), then the URL must be explicitly specified with myUrl.
jgroups.clusterName : The name of the high-availability cluster. When peers discover themselves dynamically this name is used to determine which instances should work together. Only those Gerrit interfaces which are configured for the same clusterName will communicate with each other. Defaults to “GerritHA”.
jgroups.skipInterface : A name or a wildcard of network interface(s) which should be skipped for JGroups communication. Peer discovery may fail if the host has multiple network interfaces and an inappropriate interface is chosen by JGroups. This option can be repeated many times in the jgroups section. Defaults to the list of: lo*, utun*, awdl* which are known to be inappropriate for JGroups communication.
jgroups.protocolStack : This optional parameter specifies the path of an xml file that contains the definition of JGroups protocol stack. If not specified the default protocol stack will be used. May be an absolute or relative path. If the path is relative it is resolved from the site's etc folder. For more information on protocol stack and its configuration file syntax please refer to JGroups documentation. See JGroups - Advanced topics.
NOTE: To work properly in certain environments, JGroups needs the System property java.net.preferIPv4Stack to be set to true. See JGroups - Trouble shooting.
http.user : Username to connect to the peer instance.
http.password : Password to connect to the peer instance.
@PLUGIN@ plugin uses REST API calls to keep the target instance in-sync. It is possible to customize the parameters of the underlying http client doing these calls by specifying the following fields:
http.connectionTimeout : Maximum interval of time in milliseconds the plugin waits for a connection to the target instance. When not specified, the default value is set to 5000ms.
http.socketTimeout : Maximum interval of time in milliseconds the plugin waits for a response from the target instance once the connection has been established. When not specified, the default value is set to 5000ms.
http.maxTries : Maximum number of times the plugin should attempt when calling a REST API in the target instance. Setting this value to 0 will disable retries. When not specified, the default value is 360. After this number of failed tries, an error is logged.
http.retryInterval : The interval of time in milliseconds between the subsequent auto-retries. When not specified, the default value is set to 10000ms.
NOTE: the default settings for http.timeout and http.maxTries ensure that the plugin will keep retrying to forward a message for one hour.
cache.synchronize : Whether to synchronize cache evictions. Defaults to true.
cache.threadPoolSize : Maximum number of threads used to send cache evictions to the target instance. Defaults to 4.
cache.pattern : Pattern to match names of custom caches for which evictions should be forwarded (in addition to the core caches that are always forwarded). May be specified more than once to add multiple patterns. Defaults to an empty list, meaning only evictions of the core caches are forwarded.
event.synchronize : Whether to synchronize stream events. Defaults to true.
index.synchronize : Whether to synchronize secondary indexes. Defaults to true.
index.threadPoolSize : Maximum number of threads used to send index events to the target instance. Defaults to 4.
websession.synchronize : Whether to synchronize web sessions. Defaults to true.
websession.cleanupInterval : Frequency for deleting expired web sessions. Values should use common time unit suffixes to express their setting:
1 week is treated as 7 days)1 month is treated as 30 days)1 year is treated as 365 days) If a time unit suffix is not specified, hours is assumed. Defaults to 24 hours.healthcheck.enable : Whether to enable the health check endpoint. Defaults to ‘true’.