Nexus: Unknown Task called "Storage facet cleanup" - nexus

Question

I installed Sonatype Nexus OSS 3.6.2-01
and although I did not configured any Scheduled Tasks I can see in the commandline that Nexus is running a task called "Storage facet cleanup" every ten minutes.
Because of I could not find anything about this task I finally came up here.
2017-12-20 08:40:00,013+0100 INFO [quartz-3-thread-19] *SYSTEM org.sonatype.nexus.quartz.internal.task.QuartzTaskInfo - Task 'Storage facet cleanup' [repository.storage-facet-cleanup] state change WAITING -> RUNNING
2017-12-20 08:40:00,051+0100 INFO [quartz-3-thread-19] *SYSTEM org.sonatype.nexus.quartz.internal.task.QuartzTaskInfo - Task 'Storage facet cleanup' [repository.storage-facet-cleanup] state change RUNNING -> WAITING (OK)
2017-12-20 08:50:00,014+0100 INFO [quartz-3-thread-19] *SYSTEM org.sonatype.nexus.quartz.internal.task.QuartzTaskInfo - Task 'Storage facet cleanup' [repository.storage-facet-cleanup] state change WAITING -> RUNNING
2017-12-20 08:50:00,029+0100 INFO [quartz-3-thread-19] *SYSTEM org.sonatype.nexus.quartz.internal.task.QuartzTaskInfo - Task 'Storage facet cleanup' [repository.storage-facet-cleanup] state change RUNNING -> WAITING (OK)
2017-12-20 09:00:00,015+0100 INFO [quartz-3-thread-19] *SYSTEM org.sonatype.nexus.quartz.internal.task.QuartzTaskInfo - Task 'Storage facet cleanup' [repository.storage-facet-cleanup] state change WAITING -> RUNNING
2017-12-20 09:00:00,031+0100 INFO [quartz-3-thread-19] *SYSTEM org.sonatype.nexus.quartz.internal.task.QuartzTaskInfo - Task 'Storage facet cleanup' [repository.storage-facet-cleanup] state change RUNNING -> WAITING (OK)
2017-12-20 09:10:00,016+0100 INFO [quartz-3-thread-19] *SYSTEM org.sonatype.nexus.quartz.internal.task.QuartzTaskInfo - Task 'Storage facet cleanup' [repository.storage-facet-cleanup] state change WAITING -> RUNNING
2017-12-20 09:10:00,032+0100 INFO [quartz-3-thread-19] *SYSTEM org.sonatype.nexus.quartz.internal.task.QuartzTaskInfo - Task 'Storage facet cleanup' [repository.storage-facet-cleanup] state change RUNNING -> WAITING (OK)
What is this task for?
Why is it not visible in the "Tasks" Section of the admin-panel?
Is there a way to disable this task (or configure it running only at night)?

Answer 1

This is a cleanup task which is required to have NXRM run correctly. It is not listed because it's not disablable/configurable.

Answer 2

This is a cleanup task defined in the class StorageFacetCleanupTask which run performDeletions() on the storageFacetManager:
#Override
protected Void execute() throws Exception {
thread = Thread.currentThread();
long count;
do {
count = storageFacetManager.performDeletions();
}
while (count > 0 && !isCanceled());
return null;
}
The method performDeletions is defined in StorageFacetManagerImpl and it delete all buckets marked with P_PENDING_DELETION:
#Override
#Guarded(by = STARTED)
public long performDeletions() {
List<Bucket> buckets = findBucketsForDeletion();
return buckets.stream().filter((bucket) -> {
try {
log.info("Deleting bucket for repository {}", bucket.getRepositoryName());
deleteBucket(bucket);
return true;
}
catch (Exception e) {
log.warn("Unable to delete bucket with repository name {}, will require manual cleanup",
bucket.getRepositoryName(), e);
return false;
}
}).count();
}
All buckets marked with P_PENDING_DELETION are collected by findBucketsForDeletion in StorageFacetManagerImpl:
private List<Bucket> findBucketsForDeletion() {
return inTx(databaseInstanceProvider).call(db -> {
return StreamSupport
.stream(bucketEntityAdapter.browse(db).spliterator(), false)
.filter((bucket) -> bucket.attributes().contains(P_PENDING_DELETION))
.collect(Collectors.toList());
});
}