Chapter 17. Troubleshooting Data Grid Server deployments Gather diagnostic information about Data Grid Server deployments and perform troubleshooting steps to resolve issues. 17.1. Getting diagnostic reports from Data Grid Server Data Grid Server provides aggregated reports in tar.gz archives that contain diagnostic information about server instances and host systems. The report provides details about CPU, memory, open files, network sockets and routing, threads, in addition to configuration and log files. Procedure Create a CLI connection to Data Grid Server. Use the server report command to download a tar.gz archive: The command responds with the name of the report, as in the following example: Move the tar.gz file to a suitable location on your filesystem. Extract the tar.gz file with any archiving tool. 17.2. Changing Data Grid Server logging configuration at runtime Modify the logging configuration for Data Grid Server at runtime to temporarily adjust logging to troubleshoot issues and perform root cause analysis. Modifying the logging configuration through the CLI is a runtime-only operation, which means that changes: Are not saved to the log4j2.xml file. Restarting server nodes or the entire cluster resets the logging configuration to the default properties in the log4j2.xml file. Apply only to the nodes in the cluster when you invoke the CLI. Nodes that join the cluster after you change the logging configuration use the default properties. Procedure Create a CLI connection to Data Grid Server. Use the logging to make the required adjustments. List all appenders defined on the server: The command provides a JSON response such as the following: { "STDOUT" : { "name" : "STDOUT" }, "JSON-FILE" : { "name" : "JSON-FILE" }, "HR-ACCESS-FILE" : { "name" : "HR-ACCESS-FILE" }, "FILE" : { "name" : "FILE" }, "REST-ACCESS-FILE" : { "name" : "REST-ACCESS-FILE" } } List all logger configurations defined on the server: The command provides a JSON response such as the following: [ { "name" : "", "level" : "INFO", "appenders" : [ "STDOUT", "FILE" ] }, { "name" : "org.infinispan.HOTROD_ACCESS_LOG", "level" : "INFO", "appenders" : [ "HR-ACCESS-FILE" ] }, { "name" : "com.arjuna", "level" : "WARN", "appenders" : [ ] }, { "name" : "org.infinispan.REST_ACCESS_LOG", "level" : "INFO", "appenders" : [ "REST-ACCESS-FILE" ] } ] Add and modify logger configurations with the set subcommand For example, the following command sets the logging level for the org.infinispan package to DEBUG : Remove existing logger configurations with the remove subcommand. For example, the following command removes the org.infinispan logger configuration, which means the root configuration is used instead: 17.3. Gathering resource statistics from the CLI You can inspect server-collected statistics for some Data Grid Server resources with the stats command. Use the stats command either from the context of a resource that provides statistics (containers, caches) or with a path to such a resource: { "statistics_enabled" : true, "number_of_entries" : 0, "hit_ratio" : 0.0, "read_write_ratio" : 0.0, "time_since_start" : 0, "time_since_reset" : 49, "current_number_of_entries" : 0, "current_number_of_entries_in_memory" : 0, "off_heap_memory_used" : 0, "data_memory_used" : 0, "stores" : 0, "retrievals" : 0, "hits" : 0, "misses" : 0, "remove_hits" : 0, "remove_misses" : 0, "evictions" : 0, "average_read_time" : 0, "average_read_time_nanos" : 0, "average_write_time" : 0, "average_write_time_nanos" : 0, "average_remove_time" : 0, "average_remove_time_nanos" : 0, "required_minimum_number_of_nodes" : -1 } { "time_since_start" : -1, "time_since_reset" : -1, "current_number_of_entries" : -1, "current_number_of_entries_in_memory" : -1, "off_heap_memory_used" : -1, "data_memory_used" : -1, "stores" : -1, "retrievals" : -1, "hits" : -1, "misses" : -1, "remove_hits" : -1, "remove_misses" : -1, "evictions" : -1, "average_read_time" : -1, "average_read_time_nanos" : -1, "average_write_time" : -1, "average_write_time_nanos" : -1, "average_remove_time" : -1, "average_remove_time_nanos" : -1, "required_minimum_number_of_nodes" : -1 } 17.4. Accessing cluster health via REST Get Data Grid cluster health via the REST API. Procedure Invoke a GET request to retrieve cluster health. Data Grid responds with a JSON document such as the following: { "cluster_health":{ "cluster_name":"ISPN", "health_status":"HEALTHY", "number_of_nodes":2, "node_names":[ "NodeA-36229", "NodeB-28703" ] }, "cache_health":[ { "status":"HEALTHY", "cache_name":"___protobuf_metadata" }, { "status":"HEALTHY", "cache_name":"cache2" }, { "status":"HEALTHY", "cache_name":"mycache" }, { "status":"HEALTHY", "cache_name":"cache1" } ] } Tip Get Cache Manager status as follows: Reference See the REST v2 (version 2) API documentation for more information. 17.5. Accessing cluster health via JMX Retrieve Data Grid cluster health statistics via JMX. Procedure Connect to Data Grid server using any JMX capable tool such as JConsole and navigate to the following object: Select available MBeans to retrieve cluster health statistics.

Commands:
server report Downloaded report 'infinispan-<hostname>-<timestamp>-report.tar.gz'
Downloaded report 'infinispan-<hostname>-<timestamp>-report.tar.gz'
logging list-appenders
{ "STDOUT" : { "name" : "STDOUT" }, "JSON-FILE" : { "name" : "JSON-FILE" }, "HR-ACCESS-FILE" : { "name" : "HR-ACCESS-FILE" }, "FILE" : { "name" : "FILE" }, "REST-ACCESS-FILE" : { "name" : "REST-ACCESS-FILE" } }
logging list-loggers
[ { "name" : "", "level" : "INFO", "appenders" : [ "STDOUT", "FILE" ] }, { "name" : "org.infinispan.HOTROD_ACCESS_LOG", "level" : "INFO", "appenders" : [ "HR-ACCESS-FILE" ] }, { "name" : "com.arjuna", "level" : "WARN", "appenders" : [ ] }, { "name" : "org.infinispan.REST_ACCESS_LOG", "level" : "INFO", "appenders" : [ "REST-ACCESS-FILE" ] } ]
logging set --level=DEBUG org.infinispan
logging remove org.infinispan
stats
{ "statistics_enabled" : true, "number_of_entries" : 0, "hit_ratio" : 0.0, "read_write_ratio" : 0.0, "time_since_start" : 0, "time_since_reset" : 49, "current_number_of_entries" : 0, "current_number_of_entries_in_memory" : 0, "off_heap_memory_used" : 0, "data_memory_used" : 0, "stores" : 0, "retrievals" : 0, "hits" : 0, "misses" : 0, "remove_hits" : 0, "remove_misses" : 0, "evictions" : 0, "average_read_time" : 0, "average_read_time_nanos" : 0, "average_write_time" : 0, "average_write_time_nanos" : 0, "average_remove_time" : 0, "average_remove_time_nanos" : 0, "required_minimum_number_of_nodes" : -1 }
stats /containers/default/caches/mycache
{ "time_since_start" : -1, "time_since_reset" : -1, "current_number_of_entries" : -1, "current_number_of_entries_in_memory" : -1, "off_heap_memory_used" : -1, "data_memory_used" : -1, "stores" : -1, "retrievals" : -1, "hits" : -1, "misses" : -1, "remove_hits" : -1, "remove_misses" : -1, "evictions" : -1, "average_read_time" : -1, "average_read_time_nanos" : -1, "average_write_time" : -1, "average_write_time_nanos" : -1, "average_remove_time" : -1, "average_remove_time_nanos" : -1, "required_minimum_number_of_nodes" : -1 }
GET /rest/v2/container/health
{ "cluster_health":{ "cluster_name":"ISPN", "health_status":"HEALTHY", "number_of_nodes":2, "node_names":[ "NodeA-36229", "NodeB-28703" ] }, "cache_health":[ { "status":"HEALTHY", "cache_name":"___protobuf_metadata" }, { "status":"HEALTHY", "cache_name":"cache2" }, { "status":"HEALTHY", "cache_name":"mycache" }, { "status":"HEALTHY", "cache_name":"cache1" } ] }
GET /rest/v2/container/health/status
org.infinispan:type=CacheManager,name="default",component=CacheContainerHealth