CBGT Persisted State

CBGT State

The new distributed index 1.2 release will be using CBGT for the first time -- CBGT is the component that gives us the sharded DCP feed. CBGT stores internal state in two places:

Files - CBGT needs to store some files which persist some of it's node-specific internal state. The directory for these files is specified in db/cluster_config/data_dir.

Bucket - CBGT also stores it's "CFG" document in a bucket, which contains configuration/metadata that is relevant to all nodes in the cluster.

Test case: delete data_dir

• Setup a two node Sync Gateway cluster
• Stop one SG node
• Delete the data_dir
• Restart the SG node
• Make sure it starts successfully and continues to receive DCP updates upon restart (unfortunately, I think the only way to do that is to look in the logs)

Test case: delete CFG document

• Setup a two node Sync Gateway cluster
• Stop both SG nodes
• Delete the _sync:CFG document in the bucket specified in db/cluster_config/bucket
• Restart the SG nodes
• Make sure it starts successfully and continues to receive DCP updates upon restart (unfortunately, I think the only way to do that is to look in the logs)