All Janusgraph valuemap queries are failing with Cannot invoke "org.janusgraph.core.Multiplicity.isConstrained()" because "multiplicity" is null

[sumandas0]

Here's a grammar-corrected version of your text:

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We are starting up JanusGraph 1.0.0 with Cassandra 3 as storage and Elasticsearch 7.17, with atomic mutation enabled. After bootstrapping JanusGraph, it ran for 1 day, then suddenly we got a lot of inconsistent results and the whole JG became corrupted. Indexes are unusable, and we can't inspect vertices or perform index operations. Here are some Janus operations:

gremlin> g.V().limit(1).valueMap()
Cannot invoke "org.janusgraph.core.Multiplicity.isConstrained()" because "multiplicity" is null
Type ':help' or ':h' for help.
Display stack trace? [yN]n
gremlin> g.V()
==>v[1614040]
==>v[40964240]
==>v[40964280]
==>v[40968424]
==>v[40964248]
gremlin> g.V(1614040)
==>v[1614040]
gremlin> g.V(1614040).valueMap()
Cannot invoke "org.janusgraph.core.Multiplicity.isConstrained()" because "multiplicity" is null
Type ':help' or ':h' for help.
Display stack trace? [yN]

There weren't many failures in Cassandra either. Here are the errors we encountered:

2025-10-22 00:57:51.372 log=Caused by: org.apache.cassandra.exceptions.ConfigurationException: 
Column family ID mismatch (found e41d2660-aeb3-11f0-80e1-29ae64384342; 
expected e4131440-aeb3-11f0-b753-6b6e6587e730)

Any idea what might be the reason for this?