Chapter 4. Enabling and configuring Data Grid statistics and JMX monitoring Data Grid can provide Cache Manager and cache statistics as well as export JMX MBeans. 4.1. Configuring Data Grid metrics Data Grid generates metrics that are compatible with any monitoring system. Gauges provide values such as the average number of nanoseconds for write operations or JVM uptime. Histograms provide details about operation execution times such as read, write, and remove times. By default, Data Grid generates gauges when you enable statistics but you can also configure it to generate histograms. Note Data Grid metrics are provided at the vendor scope. Metrics related to the JVM are provided in the base scope. Procedure Open your Data Grid configuration for editing. Add the metrics element or object to the cache container. Enable or disable gauges with the gauges attribute or field. Enable or disable histograms with the histograms attribute or field. Save and close your client configuration. Metrics configuration XML <infinispan> <cache-container statistics="true"> <metrics gauges="true" histograms="true" /> </cache-container> </infinispan> JSON { "infinispan" : { "cache-container" : { "statistics" : "true", "metrics" : { "gauges" : "true", "histograms" : "true" } } } } YAML infinispan: cacheContainer: statistics: "true" metrics: gauges: "true" histograms: "true" Additional resources Micrometer Prometheus 4.2. Registering JMX MBeans Data Grid can register JMX MBeans that you can use to collect statistics and perform administrative operations. You must also enable statistics otherwise Data Grid provides 0 values for all statistic attributes in JMX MBeans. Important Use JMX Mbeans for collecting statistics only when Data Grid is embedded in applications and not with a remote Data Grid server. When you use JMX Mbeans for collecting statistics from a remote Data Grid server, the data received from JMX Mbeans might differ from the data received from other APIs such as REST. In such cases the data received from the other APIs is more accurate. Procedure Open your Data Grid configuration for editing. Add the jmx element or object to the cache container and specify true as the value for the enabled attribute or field. Add the domain attribute or field and specify the domain where JMX MBeans are exposed, if required. Save and close your client configuration. JMX configuration XML <infinispan> <cache-container statistics="true"> <jmx enabled="true" domain="example.com"/> </cache-container> </infinispan> JSON { "infinispan" : { "cache-container" : { "statistics" : "true", "jmx" : { "enabled" : "true", "domain" : "example.com" } } } } YAML infinispan: cacheContainer: statistics: "true" jmx: enabled: "true" domain: "example.com" 4.2.1. Enabling JMX remote ports Provide unique remote JMX ports to expose Data Grid MBeans through connections in JMXServiceURL format. You can enable remote JMX ports using one of the following approaches: Enable remote JMX ports that require authentication to one of the Data Grid Server security realms. Enable remote JMX ports manually using the standard Java management configuration options. Prerequisites For remote JMX with authentication, define JMX specific user roles using the default security realm. Users must have controlRole with read/write access or the monitorRole with read-only access to access any JMX resources. Data Grid automatically maps global ADMIN and MONITOR permissions to the JMX controlRole and monitorRole roles. Procedure Start Data Grid Server with a remote JMX port enabled using one of the following ways: Enable remote JMX through port 9999 . Warning Using remote JMX with SSL disabled is not intended for production environments. Pass the following system properties to Data Grid Server at startup. Warning Enabling remote JMX with no authentication or SSL is not secure and not recommended in any environment. Disabling authentication and SSL allows unauthorized users to connect to your server and access the data hosted there. Additional resources Creating security realms 4.2.2. Data Grid MBeans Data Grid exposes JMX MBeans that represent manageable resources. org.infinispan:type=Cache Attributes and operations available for cache instances. org.infinispan:type=CacheManager Attributes and operations available for Cache Managers, including Data Grid cache and cluster health statistics. For a complete list of available JMX MBeans along with descriptions and available operations and attributes, see the Data Grid JMX Components documentation. Additional resources Data Grid JMX Components 4.2.3. Registering MBeans in custom MBean servers Data Grid includes an MBeanServerLookup interface that you can use to register MBeans in custom MBeanServer instances. Prerequisites Create an implementation of MBeanServerLookup so that the getMBeanServer() method returns the custom MBeanServer instance. Configure Data Grid to register JMX MBeans. Procedure Open your Data Grid configuration for editing. Add the mbean-server-lookup attribute or field to the JMX configuration for the Cache Manager. Specify fully qualified name (FQN) of your MBeanServerLookup implementation. Save and close your client configuration. JMX MBean server lookup configuration XML <infinispan> <cache-container statistics="true"> <jmx enabled="true" domain="example.com" mbean-server-lookup="com.example.MyMBeanServerLookup"/> </cache-container> </infinispan> JSON { "infinispan" : { "cache-container" : { "statistics" : "true", "jmx" : { "enabled" : "true", "domain" : "example.com", "mbean-server-lookup" : "com.example.MyMBeanServerLookup" } } } } YAML infinispan: cacheContainer: statistics: "true" jmx: enabled: "true" domain: "example.com" mbeanServerLookup: "com.example.MyMBeanServerLookup" 4.3. Exporting metrics during a state transfer operation You can export time metrics for clustered caches that Data Grid redistributes across nodes. A state transfer operation occurs when a clustered cache topology changes, such as a node joining or leaving a cluster. During a state transfer operation, Data Grid exports metrics from each cache, so that you can determine a cache's status. A state transfer exposes attributes as properties, so that Data Grid can export metrics from each cache. Note You cannot perform a state transfer operation in invalidation mode. Data Grid generates time metrics that are compatible with the REST API and the JMX API. Prerequisites Configure Data Grid metrics. Enable metrics for your cache type, such as embedded cache or remote cache. Initiate a state transfer operation by changing your clustered cache topology. Procedure Choose one of the following methods: Configure Data Grid to use the REST API to collect metrics. Configure Data Grid to use the JMX API to collect metrics. Additional resources Enabling and configuring Data Grid statistics and JMX monitoring (Data Grid caches) StateTransferManager (Data Grid 15.0 API) 4.4. Monitoring the status of cross-site replication Monitor the site status of your backup locations to detect interruptions in the communication between the sites. When a remote site status changes to offline , Data Grid stops replicating your data to the backup location. Your data become out of sync and you must fix the inconsistencies before bringing the clusters back online. Monitoring cross-site events is necessary for early problem detection. Use one of the following monitoring strategies: Monitoring cross-site replication with the REST API Monitoring cross-site replication with the Prometheus metrics or any other monitoring system Monitoring cross-site replication with the REST API Monitor the status of cross-site replication for all caches using the REST endpoint. You can implement a custom script to poll the REST endpoint or use the following example. Prerequisites Enable cross-site replication. Procedure Implement a script to poll the REST endpoint. The following example demonstrates how you can use a Python script to poll the site status every five seconds. #!/usr/bin/python3 import time import requests from requests.auth import HTTPDigestAuth class InfinispanConnection: def __init__(self, server: str = 'http://localhost:11222', cache_manager: str = 'default', auth: tuple = ('admin', 'change_me')) -> None: super().__init__() self.__url = f'{server}/rest/v2/container/x-site/backups/' self.__auth = auth self.__headers = { 'accept': 'application/json' } def get_sites_status(self): try: rsp = requests.get(self.__url, headers=self.__headers, auth=HTTPDigestAuth(self.__auth[0], self.__auth[1])) if rsp.status_code != 200: return None return rsp.json() except: return None # Specify credentials for Data Grid user with permission to access the REST endpoint USERNAME = 'admin' PASSWORD = 'change_me' # Set an interval between cross-site status checks POLL_INTERVAL_SEC = 5 # Provide a list of servers SERVERS = [ InfinispanConnection('http://127.0.0.1:11222', auth=(USERNAME, PASSWORD)), InfinispanConnection('http://127.0.0.1:12222', auth=(USERNAME, PASSWORD)) ] #Specify the names of remote sites REMOTE_SITES = [ 'nyc' ] #Provide a list of caches to monitor CACHES = [ 'work', 'sessions' ] def on_event(site: str, cache: str, old_status: str, new_status: str): # TODO implement your handling code here print(f'site={site} cache={cache} Status changed {old_status} -> {new_status}') def __handle_mixed_state(state: dict, site: str, site_status: dict): if site not in state: state[site] = {c: 'online' if c in site_status['online'] else 'offline' for c in CACHES} return for cache in CACHES: __update_cache_state(state, site, cache, 'online' if cache in site_status['online'] else 'offline') def __handle_online_or_offline_state(state: dict, site: str, new_status: str): if site not in state: state[site] = {c: new_status for c in CACHES} return for cache in CACHES: __update_cache_state(state, site, cache, new_status) def __update_cache_state(state: dict, site: str, cache: str, new_status: str): old_status = state[site].get(cache) if old_status != new_status: on_event(site, cache, old_status, new_status) state[site][cache] = new_status def update_state(state: dict): rsp = None for conn in SERVERS: rsp = conn.get_sites_status() if rsp: break if rsp is None: print('Unable to fetch site status from any server') return for site in REMOTE_SITES: site_status = rsp.get(site, {}) new_status = site_status.get('status') if new_status == 'mixed': __handle_mixed_state(state, site, site_status) else: __handle_online_or_offline_state(state, site, new_status) if __name__ == '__main__': _state = {} while True: update_state(_state) time.sleep(POLL_INTERVAL_SEC) When a site status changes from online to offline or vice-versa, the function on_event is invoked. If you want to use this script, you must specify the following variables: USERNAME and PASSWORD : The username and password of Data Grid user with permission to access the REST endpoint. POLL_INTERVAL_SEC : The number of seconds between polls. SERVERS : The list of Data Grid Servers at this site. The script only requires a single valid response but the list is provided to allow fail over. REMOTE_SITES : The list of remote sites to monitor on these servers. CACHES : The list of cache names to monitor. Additional resources REST API: Getting status of backup locations Monitoring cross-site replication with the Prometheus metrics Prometheus, and other monitoring systems, let you configure alerts to detect when a site status changes to offline . Tip Monitoring cross-site latency metrics can help you to discover potential issues. Prerequisites Enable cross-site replication. Procedure Configure Data Grid metrics. Configure alerting rules using the Prometheus metrics format. For the site status, use 1 for online and 0 for offline . For the expr filed, use the following format: vendor_cache_manager_default_cache_<cache name>_x_site_admin_<site name>_status . In the following example, Prometheus alerts you when the NYC site gets offline for cache named work or sessions . groups: - name: Cross Site Rules rules: - alert: Cache Work and Site NYC expr: vendor_cache_manager_default_cache_work_x_site_admin_nyc_status == 0 - alert: Cache Sessions and Site NYC expr: vendor_cache_manager_default_cache_sessions_x_site_admin_nyc_status == 0 The following image shows an alert that the NYC site is offline for cache work . Figure 4.1. Prometheus Alert Additional resources Configuring Data Grid metrics Prometheus Alerting Overview Grafana Alerting Documentation Openshift Managing Alerts

Commands:
<infinispan> <cache-container statistics="true"> <metrics gauges="true" histograms="true" /> </cache-container> </infinispan>
{ "infinispan" : { "cache-container" : { "statistics" : "true", "metrics" : { "gauges" : "true", "histograms" : "true" } } } }
infinispan: cacheContainer: statistics: "true" metrics: gauges: "true" histograms: "true"
<infinispan> <cache-container statistics="true"> <jmx enabled="true" domain="example.com"/> </cache-container> </infinispan>
{ "infinispan" : { "cache-container" : { "statistics" : "true", "jmx" : { "enabled" : "true", "domain" : "example.com" } } } }
infinispan: cacheContainer: statistics: "true" jmx: enabled: "true" domain: "example.com"
bin/server.sh --jmx 9999
bin/server.sh -Dcom.sun.management.jmxremote.port=9999 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false
<infinispan> <cache-container statistics="true"> <jmx enabled="true" domain="example.com" mbean-server-lookup="com.example.MyMBeanServerLookup"/> </cache-container> </infinispan>
{ "infinispan" : { "cache-container" : { "statistics" : "true", "jmx" : { "enabled" : "true", "domain" : "example.com", "mbean-server-lookup" : "com.example.MyMBeanServerLookup" } } } }
infinispan: cacheContainer: statistics: "true" jmx: enabled: "true" domain: "example.com" mbeanServerLookup: "com.example.MyMBeanServerLookup"
#!/usr/bin/python3 import time import requests from requests.auth import HTTPDigestAuth class InfinispanConnection: def __init__(self, server: str = 'http://localhost:11222', cache_manager: str = 'default', auth: tuple = ('admin', 'change_me')) -> None: super().__init__() self.__url = f'{server}/rest/v2/container/x-site/backups/' self.__auth = auth self.__headers = { 'accept': 'application/json' } def get_sites_status(self): try: rsp = requests.get(self.__url, headers=self.__headers, auth=HTTPDigestAuth(self.__auth[0], self.__auth[1])) if rsp.status_code != 200: return None return rsp.json() except: return None Specify credentials for Data Grid user with permission to access the REST endpoint USERNAME = 'admin' PASSWORD = 'change_me' Set an interval between cross-site status checks POLL_INTERVAL_SEC = 5 Provide a list of servers SERVERS = [ InfinispanConnection('http://127.0.0.1:11222', auth=(USERNAME, PASSWORD)), InfinispanConnection('http://127.0.0.1:12222', auth=(USERNAME, PASSWORD)) ] #Specify the names of remote sites REMOTE_SITES = [ 'nyc' ] #Provide a list of caches to monitor CACHES = [ 'work', 'sessions' ] def on_event(site: str, cache: str, old_status: str, new_status: str): # TODO implement your handling code here print(f'site={site} cache={cache} Status changed {old_status} -> {new_status}') def __handle_mixed_state(state: dict, site: str, site_status: dict): if site not in state: state[site] = {c: 'online' if c in site_status['online'] else 'offline' for c in CACHES} return for cache in CACHES: __update_cache_state(state, site, cache, 'online' if cache in site_status['online'] else 'offline') def __handle_online_or_offline_state(state: dict, site: str, new_status: str): if site not in state: state[site] = {c: new_status for c in CACHES} return for cache in CACHES: __update_cache_state(state, site, cache, new_status) def __update_cache_state(state: dict, site: str, cache: str, new_status: str): old_status = state[site].get(cache) if old_status != new_status: on_event(site, cache, old_status, new_status) state[site][cache] = new_status def update_state(state: dict): rsp = None for conn in SERVERS: rsp = conn.get_sites_status() if rsp: break if rsp is None: print('Unable to fetch site status from any server') return for site in REMOTE_SITES: site_status = rsp.get(site, {}) new_status = site_status.get('status') if new_status == 'mixed': __handle_mixed_state(state, site, site_status) else: __handle_online_or_offline_state(state, site, new_status) if __name__ == '__main__': _state = {} while True: update_state(_state) time.sleep(POLL_INTERVAL_SEC)
groups: - name: Cross Site Rules rules: - alert: Cache Work and Site NYC expr: vendor_cache_manager_default_cache_work_x_site_admin_nyc_status == 0 - alert: Cache Sessions and Site NYC expr: vendor_cache_manager_default_cache_sessions_x_site_admin_nyc_status == 0