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The Nirvana Enterprise Manager allows you to view
the connections (channel subscriptions) on a realm and
drilldown to view more detailed information about each
connection, such as the last event sent or received,
and the rate of events sent and received from each connection.
To view connections for a channel, select a channel
node from the namespace, and select the 'Connections'
tab. This will display a panel containing a table of
connections, as shown in the image below.
The connections table has 6columns:
Protocol - The protocol
used in the connection
User - The name of the user connected
Host - The host machine that the
user is connecting from
Connection - The local connection
id, defined as hostname:local_port
Sub-Name- The named
object reference if one has been provided
Filter - The filter
string for the subscription if one has been provided
The highlighted connection above shows that the user
has subscriber to the /customer/sales channel using
the nhp protocol, to localhost. The user has also provided
a named object called 'johnsmith' and a filter of "REGION='UK'"
which will ensure the user only consumes events with
the value 'UK' in the REGION property of the event
properties.
When a connection is highlighted, there a number of
things that can be shown for a the connection.
Firstly, connections can be disconnected by clicking
on the 'Disconnect' button.
Secondly, by double-clicking on a connection from the
table, or by clicking on the 'Show Details' button,
you are presented with a panel that contains a more
detailed look at the activity for the selected connection.
The connection details panel is shown in the image below.
The two graphs, labelled 'Tx Event History' and 'Rx
Event History' show the total (yellow) and rates (red)
for events received from the server (TX) and sent to
the server (RX) for the selected connection.
The bottom of the connection details panel shows 3
sections of information for the selected connection,
'Events Sent', 'Events Received' and 'Status'. Each
of these are described below.
Events Sent
The Events Sent section shows 5 values:
Total - The total number of events
sent by the realm server to this conneciton
Rate - The rate at which events are
being sent by the realm server to this connection
Max - The maximum rate at which events
have been sent by the realm server to this connection
Last Event Type - The type of the
last event sent from the realm server
Bytes - Total bytes sent by the realm
server to this connection
Events Received
The Events Received section shows 5 values:
Total - The total number of events
sent by this connection to the realm server
Rate - The rate at which events are
being sent by connection to the realm server
Max - The maximum rate at which events
have been sent by this connection to the realm server
Last Event Type - The type of the
last event sent from the connection to the realm server
Bytes - Total bytes sent by this
connection to the realm server
Status
The Events Sent section shows 4values:
Connect Time - The amount of time
this connection has been connected to the realm server
Queue Size - The number of events
in the outbound queue of this connection (i.e. events
waiting to be sent to the realm server)
Last Tx - The time since the last
event was received by this connection from the realm
server
Last Rx - The time since the last
event was sent to the server from this connection
Clicking on the 'Show List' button will take you back
to the connections table. |
