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Chapter 4. Performing cross-site operations with the REST API
Data Grid Server provides a REST endpoint that exposes methods for performing cross-site operations.
4.1. Getting status of all backup locations
Retrieve the status of all backup locations with GET requests.
GET /rest/v2/caches/{cacheName}/x-site/backups/Data Grid responds with the status of each backup location in JSON format, as in the following example:
{
"NYC": {
"status": "online"
},
"LON": {
"status": "mixed",
"online": [
"NodeA"
],
"offline": [
"NodeB"
]
}
}| Value | Description |
|---|---|
|
| All nodes in the local cluster have a cross-site view with the backup location. |
|
| No nodes in the local cluster have a cross-site view with the backup location. |
|
| Some nodes in the local cluster have a cross-site view with the backup location, other nodes in the local cluster do not have a cross-site view. The response indicates status for each node. |
4.2. Getting status of specific backup locations
Retrieve the status of a backup location with GET requests.
GET /rest/v2/caches/{cacheName}/x-site/backups/{siteName}Data Grid responds with the status of each node in the site in JSON format, as in the following example:
{
"NodeA":"offline",
"NodeB":"online"
}| Value | Description |
|---|---|
|
| The node is online. |
|
| The node is offline. |
|
| Not possible to retrieve status. The remote cache could be shutting down or a network error occurred during the request. |
4.3. Taking backup locations offline
Take backup locations offline with POST requests and the ?action=take-offline parameter.
POST /rest/v2/caches/{cacheName}/x-site/backups/{siteName}?action=take-offline4.4. Bringing backup locations online
Bring backup locations online with the ?action=bring-online parameter.
POST /rest/v2/caches/{cacheName}/x-site/backups/{siteName}?action=bring-online4.5. Pushing state to backup locations
Push cache state to a backup location with the ?action=start-push-state parameter.
POST /rest/v2/caches/{cacheName}/x-site/backups/{siteName}?action=start-push-state4.6. Canceling state transfer
Cancel state transfer operations with the ?action=cancel-push-state parameter.
POST /rest/v2/caches/{cacheName}/x-site/backups/{siteName}?action=cancel-push-state4.7. Getting state transfer status
Retrieve status of state transfer operations with the ?action=push-state-status parameter.
GET /rest/v2/caches/{cacheName}/x-site/backups?action=push-state-statusData Grid responds with the status of state transfer for each backup location in JSON format, as in the following example:
{
"NYC":"CANCELED",
"LON":"OK"
}| Value | Description |
|---|---|
|
| State transfer to the backup location is in progress. |
|
| State transfer completed successfully. |
|
| An error occurred with state transfer. Check log files. |
|
| State transfer cancellation is in progress. |
4.8. Clearing state transfer status
Clear state transfer status for sending sites with the ?action=clear-push-state-status parameter.
POST /rest/v2/caches/{cacheName}/x-site/local?action=clear-push-state-status4.9. Modifying take offline conditions
Sites go offline if certain conditions are met. Modify the take offline parameters to control when backup locations automatically go offline.
Procedure
Check configured take offline parameters with
GETrequests and thetake-offline-configparameter.GET /rest/v2/caches/{cacheName}/x-site/backups/{siteName}/take-offline-configThe Data Grid response includes
after_failuresandmin_waitfields as follows:{ "after_failures": 2, "min_wait": 1000 }Modify take offline parameters in the body of
PUTrequests.PUT /rest/v2/caches/{cacheName}/x-site/backups/{siteName}/take-offline-configIf the operation successfully completes, the service returns
204 (No Content).
4.10. Canceling state transfer from receiving sites
If the connection between two backup locations breaks, you can cancel state transfer on the site that is receiving the push.
Cancel state transfer from a remote site and keep the current state of the local cache with the ?action=cancel-receive-state parameter.
POST /rest/v2/caches/{cacheName}/x-site/backups/{siteName}?action=cancel-receive-state4.11. Getting status of backup locations
Retrieve the status of all backup locations with GET requests.
GET /rest/v2/container/x-site/backups/
Data Grid responds with status in JSON format, as in the following example:
{
"SFO-3":{
"status":"online"
},
"NYC-2":{
"status":"mixed",
"online":[
"CACHE_1"
],
"offline":[
"CACHE_2"
],
"mixed": [
"CACHE_3"
]
}
}| Value | Description |
|---|---|
|
| All nodes in the local cluster have a cross-site view with the backup location. |
|
| No nodes in the local cluster have a cross-site view with the backup location. |
|
| Some nodes in the local cluster have a cross-site view with the backup location, other nodes in the local cluster do not have a cross-site view. The response indicates status for each node. |
GET /rest/v2/container/x-site/backups/{site}Returns the status for a single backup location.
4.12. Taking backup locations offline
Take backup locations offline with the ?action=take-offline parameter.
POST /rest/v2/container/x-site/backups/{siteName}?action=take-offline4.13. Bringing backup locations online
Bring backup locations online with the ?action=bring-online parameter.
POST /rest/v2/container/x-site/backups/{siteName}?action=bring-online4.14. Retrieving the state transfer mode
Check the state transfer mode with GET requests.
GET /rest/v2/caches/{cacheName}/x-site/backups/{site}/state-transfer-mode4.15. Setting the state transfer mode
Configure the state transfer mode with the ?action=set parameter.
POST /rest/v2/caches/{cacheName}/x-site/backups/{site}/state-transfer-mode?action=set&mode={mode}4.16. Starting state transfer
Push state of all caches to remote sites with the ?action=start-push-state parameter.
POST /rest/v2/container/x-site/backups/{siteName}?action=start-push-state4.17. Canceling state transfer
Cancel ongoing state transfer operations with the ?action=cancel-push-state parameter.
POST /rest/v2/container/x-site/backups/{siteName}?action=cancel-push-state