Failed to JanusGraphFactory.drop(graph);

[zingdle]

Hi all, I'm new to janusgraph. When I'm droping the database, the cassandra log drop keyspace janusgraph and then the driver throw exceptions. Then a few seconds later, the janusgraph complains about keyspace janusgraph not exists repeatly.

Is this related to #1313? Thanks in advance!

---

• Version: 6.0
• Storage Backend: cql
• Mixed Index Backend: elasticsearch
• Steps to Reproduce:

set up docker environment:

# go to https://github.com/JanusGraph/janusgraph-docker
docker-compose -f docker-compose-cql-es.yml up

driver code:

JanusGraph graph = JanusGraphFactory.build().
        set("storage.backend", "cql").
        set("storage.hostname", "MY_IP").
        set("storage.cql.keyspace", "janusgraph").
        set("storage.cql.local-datacenter", "datacenter1").
        set("cache.db-cache", "true").
        set("cache.db-cache-clean-wait", "20").
        set("cache.db-cache-time", "180000").
        set("cache.db-cache-size", "0.25").
        set("index.search.backend", "elasticsearch").
        set("index.search.hostname", "MY_IP").
        open();
JanusGraphFactory.drop(graph);

driver error:

com.datastax.oss.driver.api.core.DriverTimeoutException: Query timed out after PT2S
	at com.datastax.oss.driver.api.core.DriverTimeoutException.copy(DriverTimeoutException.java:34)
	at com.datastax.oss.driver.internal.core.util.concurrent.CompletableFutures.getUninterruptibly(CompletableFutures.java:149)
	at com.datastax.oss.driver.internal.core.cql.CqlRequestSyncProcessor.process(CqlRequestSyncProcessor.java:53)
	at com.datastax.oss.driver.internal.core.cql.CqlRequestSyncProcessor.process(CqlRequestSyncProcessor.java:30)
	at com.datastax.oss.driver.internal.core.session.DefaultSession.execute(DefaultSession.java:230)
	at com.datastax.oss.driver.api.core.cql.SyncCqlSession.execute(SyncCqlSession.java:54)
	at org.janusgraph.diskstorage.cql.CQLStoreManager.clearStorage(CQLStoreManager.java:278)
	at org.janusgraph.diskstorage.Backend.clearStorage(Backend.java:636)
	at org.janusgraph.core.JanusGraphFactory.drop(JanusGraphFactory.java:229)

docker log:

[li-boxuan]

This is fixed in #2811 which will be released in 0.6.1. As a temporary fix, can you change storage.cql.request-timeout to 12 seconds?

[zingdle]

Thanks to your quick response! I tried to set storage.cql.request-timeout to 12000 or even 120000, but the error still exists.

I can confirm that the cassandra is set up correctly becasue GraphOfTheGodsFactory.load(graph); works as expected.

[li-boxuan]

That is weird; can you try JanusGraph 0.5.3 and see if you encounter the same problem?

[zingdle]

Yes, the problem still exists... I'm wondering if the docker environment has something wrong here. Do you have any ideas about what could cause this?

[zingdle]

I see what goes wrong here. The demo I wrote sets up ganusgraph connection, but the Dockerfile provided here also sets up janusgraph server in the background and may interfer drop keyspace action in cassandra.

All I have to do is to stop the janusgraph container.