ALM-12190 Number of Knox Connections Exceeds the Threshold¶
Description¶
The system periodically checks the number of connections to all Knox topologies. This alarm is generated when the number of connections to a topology exceeds the threshold (90% by default). This alarm is automatically cleared when the number of connections to a topology falls below the threshold.
Note
This alarm applies to clusters of MRS 3.1.0 or later.
Attribute¶
Alarm ID | Alarm Severity | Auto Clear |
|---|---|---|
12190 | Major | Yes |
Parameters¶
Name | Meaning |
|---|---|
Source | Specifies the cluster or system for which the alarm is generated. |
ServiceName | Specifies the service for which the alarm is generated. |
RoleName | Specifies the role for which the alarm is generated. |
HostName | Specifies the host for which the alarm is generated. |
Topology | Specifies the Knox topology for which the alarm is generated. |
Impact on the System¶
The topology may reach the upper limit of connections and fail to forward requests, adversely affecting the MRS functions.
Possible Causes¶
Hue or Manager is too frequently used, but the default maximum number of Knox connections is small.
Procedure¶
Log in to active and standby OMS nodes as user root, respectively.
Add the following configuration to the gateway-site.xml file on the active and standby OMS nodes to increase the number of thread pools:
vi /opt/knox/conf/gateway-site.xml
<property> <name>gateway.httpclient.maxConnections</name> <value>64</value> </property>
Log in to the active OMS node as user omm and run the following command to restart the Knox process:
sh /opt/knox/bin/restart-knox.sh
After 5 minutes, check whether the alarm is cleared.
If yes, no further action is required.
If no, go to 5.
Contact O&M personnel to rectify the fault.
Alarm Clearing¶
This alarm is automatically cleared after the fault is rectified.