Problems with parallel running MCRPIJobs

[rsteph-de]

There are issues, if two MCRPIJob run parallel, e.g.

ERROR: duplicate key value violates unique constraint "ukr4eofeal9majqmd3uct86a29n"
  Detail: Key (category, objectid, objecttype)=(325, rosdok_bundle_0000001006, bundle) already exists.
2023-08-07T11:47:49,749 ERROR  MCREventManager: Exception caught while calling event handler
jakarta.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute statement
        at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)
   ...  at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:742)
        at org.mycore.datamodel.classifications2.impl.MCRCategLinkServiceImpl.lambda$setLinks$1(MCRCategLinkServiceImpl.java:221)
        at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
   ...  at org.mycore.datamodel.classifications2.impl.MCRCategLinkServiceImpl.setLinks(MCRCategLinkServiceImpl.java:205)
        at org.mycore.datamodel.common.MCRLinkTableManager.create(MCRLinkTableManager.java:479)
        at org.mycore.datamodel.common.MCRLinkTableManager.update(MCRLinkTableManager.java:514)
        at org.mycore.datamodel.common.MCRLinkTableEventHandler.handleObjectRepaired(MCRLinkTableEventHandler.java:82)
        at org.mycore.datamodel.common.MCRLinkTableEventHandler.handleObjectUpdated(MCRLinkTableEventHandler.java:56)
        at org.mycore.common.events.MCREventHandlerBase.doHandleEvent(MCREventHandlerBase.java:58)
     ....   at org.mycore.datamodel.metadata.MCRMetadataManager.update(MCRMetadataManager.java:739)
        at org.mycore.pi.MCRPIService.updateFlag(MCRPIService.java:485)
        at org.mycore.pi.MCRPIJobService.updateStartRegistrationDate(MCRPIJobService.java:212)
        at de.uni.rostock.ub.rosdok.common.pi.purl.MCRPURLService.registerJob(MCRPURLService.java:107)
        at de.uni.rostock.ub.rosdok.common.pi.purl.RosDokPURLService.registerJob(RosDokPURLService.java:17)
        at org.mycore.pi.MCRPIJobService.lambda$delegateAction$0(MCRPIJobService.java:307)

or

2023-08-07T11:47:48,511 ERROR  MCREventManager: Exception caught while calling event handler
io.ocfl.api.exception.ObjectOutOfSyncException: Failed to create a new version of object mcrobject:rosdok_bundle_0000001002. Changes are out of sync with the current object state.
        at io.ocfl.core.storage.DefaultOcflStorage.moveToVersionDirectory(DefaultOcflStorage.java:772)
        at io.ocfl.core.storage.DefaultOcflStorage.storeNewImmutableVersion(DefaultOcflStorage.java:644)
        at io.ocfl.core.storage.DefaultOcflStorage.storeNewVersion(DefaultOcflStorage.java:255)
        at io.ocfl.core.storage.CachingOcflStorage.storeNewVersion(CachingOcflStorage.java:95)
...      at org.mycore.ocfl.metadata.MCROCFLXMLMetadataManager.update(MCROCFLXMLMetadataManager.java:198)
        at org.mycore.ocfl.metadata.MCROCFLXMLMetadataManager.update(MCROCFLXMLMetadataManager.java:187)
        at org.mycore.datamodel.common.MCRXMLMetadataManager.update(MCRXMLMetadataManager.java:120)
        at org.mycore.datamodel.common.MCRXMLMetadataEventHandler.handleStoreEvent(MCRXMLMetadataEventHandler.java:148)
        at org.mycore.datamodel.common.MCRXMLMetadataEventHandler.handleObjectUpdated(MCRXMLMetadataEventHandler.java:70)
...        at org.mycore.datamodel.metadata.MCRMetadataManager.update(MCRMetadataManager.java:739)
        at org.mycore.pi.MCRPIService.updateFlag(MCRPIService.java:485)
        at org.mycore.pi.MCRPIJobService.updateStartRegistrationDate(MCRPIJobService.java:212)
        at de.uni.rostock.ub.rosdok.common.pi.purl.MCRPURLService.registerJob(MCRPURLService.java:107)

[rsteph-de]

reduced JobThreads: MCR.QueuedJob.JobThreads=1