Administering the MapR Data Access Gateway
The MapR Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the MapR cluster. This section describes considerations when upgrading the service, how to modify configuration settings, and how to administer and manage the service.
Installing the Data Access Gateway Service
The MapR Data Access Gateway is installed when you install MapR-DB in the MapR installer. To manually install the service, see Installing MapR Data Access Gateway. For conceptual information, see Understanding the MapR Data Access Gateway.
Upgrading the Data Access Gateway Service
When the Data Access Gateway receives a shutdown request, it stops accepting new requests and returns an error to the client. Any in-progress requests are allowed to complete before shutting down the service. This allows you to perform rolling upgrades.
Modifying Configuration Settings for the Data Access Gateway Service
Logging Properties
The MapR Data Access Gateway uses standard Log4J configuration to control its logging.
The log4j properties are in the file
/opt/mapr/data-access-gateway/conf/log4j2.xml on nodes where you have
installed the service. After modifying any properties on a node, restart the service. For
details, see Administering the Data Access Gateway Service.
Log data is stored in the
/opt/mapr/data-access-gateway/logs/data-access-gateway.log file.
You can configure MapR Data
Access Gateway properties by modifying
/opt/mapr/data-access-gateway/conf/properties.cfg on nodes where you
have installed the service.
The following table lists the properties you can set:
| Property Name | Default | Description |
|---|---|---|
auth.token.expiration |
1800 | Expiration time (in seconds) for the authentication token |
rest.https.port |
8243 | Port number used to connect to the Data Access Gateway using HTTPS |
rest.result.limit |
5000 | Limit on the number of documents returned in retrieval requests using the MapR-DB JSON REST API |
After modifying any parameters on a node, restart the service, as described in Administering the Data Access Gateway Service.
The warden configuration for the MapR Data Access
Gateway is in the file
/opt/mapr/data-access-gateway/conf/warden.data-access-gateway.conf on
nodes where you have installed the Data Access Gateway. To control the amount of memory
allocated to the service, modify the following settings:
| Parameter | Default | Description |
|---|---|---|
service.heapsize.max |
3000 | Defines the maximum heap size (in MB) for the service |
service.heapsize.min |
3000 | Defines the minimum heap size (in MB) for the service |
After modifying the warden configuration file on a node, run
configure.sh -R, and restart the
service:
/opt/mapr/server/configure.sh -R
maprcli node services -nodes <node name> -name data-access-gateway -action restartAdministering the Data Access Gateway Service
The MapR Data Access Gateway is a service that you administer in the same way as other MapR
services. The name of the service is data-access-gateway.
maprcli node services -nodes <node name> -name data-access-gateway -action restartFor details about other operations you can perform on the service, see Managing Services.