During a maintenance operation, a node will typically go through the following states at different points of the operation:
| Operation | State |
|---|---|
| Node operating normally |
ONLINE
|
| Administrator puts node into offline state |
GOING-OFFLINE
|
| Node is offline |
OFFLINE:NORMAL
|
| Administrator puts node into online state |
GOING-ONLINE:SYNCHRONIZING
|
| Node catches up with Extractor |
ONLINE
|
In the event of a failure, the sequence will trigger the node into the error state and then recovery into the online state:
| Operation | State |
|---|---|
| Node operating normally |
ONLINE
|
| Failure causes the node to go offline |
OFFLINE:ERROR
|
| Administrator fixes error and puts node into online state |
GOING-ONLINE:SYNCHRONIZING
|
| Node catches up with Extractor |
ONLINE
|
During an error state where a backup of the data is restored to a node in preparation of bringing the node back into operation:
| Operation | State |
|---|---|
| Node operating normally |
ONLINE
|
| Failure causes the node to go offline |
OFFLINE:ERROR
|
| Administrator restores node from backup data |
GOING-ONLINE:RESTORING
|
| Once restore is complete, node synchronizes with the Extractor |
GOING-ONLINE:SYNCHRONIZING
|
| Node catches up with Extractor |
ONLINE
|