Google Search Appliance Configuring Distributed Crawling and Serving version 7.2 - Manual (Page 12)

Google Search Appliance: Configuring Distributed Crawling and Serving 12
Recovering from Node Failure When GSA Mirroring is
Enabled
When a primary search appliance fails in a distributed crawling configuration and GSA mirroring is
enabled, promote a mirror node to primary and update the other search appliances in the configuration
by importing a new GSA
n configuration file.
If the primary Google Search Appliance fails and a replica search appliance is promoted to be the
primary, do not directly add the former primary node back as the primary, because this will cause
problems in the mirroring configuration. If you need to use the former primary search appliance as the
primary, add it as a replica of the new primary first. Wait until all index and configuration data are fully
synchronized with the new primary node, and then you can add the search appliance as the primary
again.
When the Failed Node is the Master Node
To recover from a node failure when GSA mirroring is enabled and the failed node is the master node:
1. On all nodes, log in to the Admin Consoles and click Content Sources > Diagnostics > Crawl
Status > Pause Crawl.
2. On all nodes, click GSA
n
> Configuration and click Disable GSA
n
.
3. Log in to the Admin Console of the previous replica node to promote it as new master node.
4. Re-configure GSA n Distributed crawling and serving by selecting a previous non-master node as
non-master to this master node.
5. Click Apply Configuration. This broadcasts the configuration data to all appliances in the GSA n
network. Note that document serving will be interrupted briefly on the master node after you click
Apply Configuration.
When the Failed Node is Not the Master Node
To recover from a node failure when GSA mirroring is enabled and the failed node is a primary search
appliance but not the master:
1. Log in to the Admin Console of the master node in the distributed crawling and serving
configuration.
2. Click GSA n > Configuration.
3. Click the Edit link for the shard configuration that contains the failed node.
4. Delete the failed node.
5. Add a replica to replace the failed primary.
6. Click Save.
7. Remove the new primary search appliance from the list of replica search appliances.
8. Click the GSA n Configuration link.
9. Click Apply Configuration. This broadcasts the configuration data to all appliances in the GSA n
network. Note that document serving will be interrupted briefly on the master node after you click
Apply Configuration.