JMX Monitoring

WSO2 ESB exposes a number of management resources as JMX MBeans that can be used for managing and monitoring the running server. These MBeans can be accessed remotely using a JMX client such as JConsole. When WSO2 ESB is starting up, it will display the JMX Service URL in the console as follows.

INFO - JMXServerManager JMX Service URL :         service:jmx:rmi://localhost:11111/jndi/rmi://localhost:9999/jmxrmi

This URL can be used to remotely access the JMX Service exposed by WSO2 ESB. In this guide, we will use JConsole as the JMX client to access this service.

Using JConsole for JMX Monitoring

Start JConsole and enter the above URL as the JMX Service URL. Type "admin" in both username and password fields and click "Connect".

After successfully connecting to the JMX service, click on "MBeans" tab of JConsole to view MBeans exposed by the ESB, which are listed under the org.apache.axis2, org.apache.synapse, and org.wso2.carbon nodes. The following section summarizes the attributes and operations available in MBeans exposed by the WSO2 ESB.

Attributes and Operations of MBeans

Transport-related MBeans

For each transport listener and sender enabled in the ESB, there will be an MBean under org.apache.axis2/Transport node which has following attributes and operations. For example, when http and https transports are enabled following MBeans will be exposed.

org.apache.axis2/Transport/nio-http-listener
org.apache.axis2/Transport/nio-http-sender
org.apache.axis2/Transport/nio-https-listener
org.apache.axis2/Transport/nio-https-sender

Attribute/Operation Name	Description
ActiveThreadCount	Threads active in this transport listener/sender.
AvgSizeReceived	Average size of received messages.
AvgSizeSent	Average size of sent messages.
MaxSizeReceived	Maximum message size of received messages.
MaxSizeSent	Maximum message size of sent messages.
MinSizeReceived	Minimum message size of received messages.
MinSizeSent	Minimum message size of sent messages.
MessagesReceived	Total number of messages received through this transport.
MessagesSent	Total number of messages sent through this transport.
FaultsReceiving	Number of faults encountered while receiving.
FaultsSending	Number of faults encountered while sending.
BytesReceived	Number of bytes received through this transport.
BytesSent	Number of bytes sent through this transport.
QueueSize	Number of messages currently queued. Messages get queued if all the worker threads in this transport thread pool are busy.
ResponseCodeTable	Number of messages sent against their response codes.
TimeoutsReceiving	Message receiving timeout.
TimeoutsSending	Message sending timeout.
LastResetTime	Last time transport listener/sender statistic recording was reset.
MetricsWindow	Time difference between current time and last reset time in milliseconds.
resetStatistics()	Clear recorded transport listener/sender statistics and restart recording.
start()	Start this transport listener/sender.
stop()	Stop this transport listener/sender.
pause()	Pause this transport listener/sender which has been started.
resume()	Resume this transport listener/sender which is currently paused.
maintenenceShutdown(long gracePeriod)	Stop processing new messages, and wait the specified maximum time for in-flight requests to complete before a controlled shutdown for maintenence.

Latency-related MBeans

org.apache.synapse/NHTTPLatencyView/nio-http
org.apache.synapse/NHTTPLatencyView/nio-https
org.apache.synapse/NHTTPS2SLatencyView/nio-http
org.apache.synapse/NHTTPS2SLatencyView/nio-https

Attribute/Operation Name	Description
AllTimeAvgLatency	Average latency since latency recording was last reset.
LastXxxAvgLatency	Average latency for last Xxx time period. For example, LastHourAvgLatency return the average latency for last hour.
LastResetTime	Last time latency statistic recording was reset.
reset()	Clear recorded latency statistics and restart recording.

NttpConnections-related MBeans

org.apache.synapse/NhttpConnections/http-listener
org.apache.synapse/NhttpConnections/http-sender
org.apache.synapse/NhttpConnections/https-listener
org.apache.synapse/NhttpConnections/https-sender

Attribute/Operation Name	Description
ActiveConnections	Number of currently active connections.
ActiveConnectionsPerHosts	A map of number of connections against hosts.
LastXxxConnections	Number of connections created during last Xxx time period.
RequestSizesMap	A map of number of requests against their sizes.
ResponseSizesMap	A map of number of responses against their sizes.
LastResetTime	Last time connection statistic recordings was reset.
reset()	Clear recorded connection statistics and restart recording.

Threading-related MBeans

These MBeans are only available in the NHTTP transport and not in the default Pass Through transport.

org.apache.synapse/Threading/HttpClientWorker
org.apache.synapse/Threading/HttpServerWorker

Attribute/Operation Name	Description
TotalWorkerCount	Total worker threads related to this server/client.
AvgUnblockedWorkerPercentage	Time-averaged unblocked worker thread percentage.
AvgBlockedWorkerPercentage	Time-averaged blocked worker thread percentage.
LastXxxBlockedWorkerPercentage	Blocked worker thread percentage averaged for last Xxx time period.

DeadLockedWorkers	Number of deadlocked worker threads since last statistics reset.
LastResetTime	Last time thread statistic recordings was reset.
reset()	Clear recorded thread statistic and restart recording.

Proxy service-related MBeans

Navigate to one of the following operations in the org.wso2.carbon/StatisticsAdmin/Operations MBean, type the proxy service name, and press Enter to get statistics for that service:

Operation	Description
getServiceRequestCount	Total requests to this service
getServiceFaultCount	Total faults from this service
getServiceResponseCount	Total responses by this service
getMaxServiceResponseTime	Maximum response time by this service
getMinServiceResponseTime	Minimum response time by this service
getAvgServiceResponseTime	Average response time by this service

You can also go to org.apache.synapse/StatisticsView/StatisticsView/Operations/getSystemProxyServiceStats to get all of these statistics in a single view.