RDF4j in AWS with a EBS volume gets corrupted?

[cgokey]

My scenario looks liked this.

1. I imported 15K RDF documents, which resulted in about 200K triples.
2. I then ran
   DELETE ?s ?p ?o WHERE { ?s ?p ?o }
3. Then attempted to reinsert those same RDF documents, think it 100 at a time, about 150 calls to a lambda, that then inserts the RDF documents.

When I try to delete immediately after, I get this:
{"message":"Error during deletion process","error":"Failed to delete triples: 500: Cannot invoke "String.hashCode()" because the return value of "org.eclipse.rdf4j.model.base.AbstractIRI.stringValue()" is null","stack":"Error: Failed to delete triples: 500: Cannot invoke "String.hashCode()" because the return value of "org.eclipse.rdf4j.model.base.AbstractIRI.stringValue()" is null\n    at Runtime.m [as handler] (/var/task/serverless/src/deleteAll/handler.js:25:963)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)"}%

And I get other 500 errors when I try to fetch. I can't seem to repeat this locally, only in AWS where data dir is a EBS volume. This is a single instance accessing the EBS volume, no scaling. I'm wondering any thoughts on what might be happening. I end up having to recreate the db due to whatever being corrupted. If I increase the page size to insert about 1000 at a time, it works and I don't see any errors.

I'm using RDF4j native store. Configuration looks like this:
cat config.ttl
@Prefix config: tag:rdf4j.org,2023:config/ .
@Prefix rdfs: http://www.w3.org/2000/01/rdf-schema# .
@Prefix xsd: http://www.w3.org/2001/XMLSchema# .

<#kms> a config:Repository;
rdfs:label "kms";
config:rep.id "kms";
config:rep.impl [
config:rep.type "openrdf:SailRepository";
config:sail.impl [
config:sail.type "openrdf:NativeStore"
]
] .

I'm using the latest version of RDF4J 5 spun up in a ECS docker container.

Thanks,
Chris

[kenwenzel]

If it is working with larger batches then this could be an indication of some issues with syncing data to disk.
Have you already tried with "forceSync" set to true?

I've found this config https://github.com/nasa/kms/blob/30504da88b43fc08f456e39a79815158267265c0/infrastructure/rdfdb/cdk/docker/scripts/create_repository.sh#L28
where an additional colon is added after forceSync.