A centralized cache is a good idea in many use cases. What you could do is to maintain a centralized cache by yourself. This, however, requires some changes to your application code (e.g. your app might need to do a look up in cache and then query JanusGraph). A more advanced approach is to rewrite ExpirationKCVSCache (https://javadoc.io/doc/org.janusgraph/janusgraph-core/latest/org/janusgraph/diskstorage/keycolumnvalue/cache/ExpirationKCVSCache.html) by yourself and let it store cache in a centralized cache rather than the local cache. Then, the db.cache feature should still work except that the cache is synced across JanusGraph instances.

Best,

Boxuan