Mongo backed jobRepository not working when using parallel processing Multi-threaded Step /asynch writer processor

[ayoubeljabiry]

i faced MongoDB WriteConflict Error when tried to use parallel processing in my job application

Environment
using spring boot 3.4.5 with spring batch , mongodb 4.4

situation i read from a mongo db -> trnsfrom -> write to another mongo db, i use mongo as db for jobrepository collections
i use cursor based item reader and the standard mongoitemwriter

[fmbenhassine]

How is parallelism configured? Do you use a concurrent step? I am asking because MongoCursorItemReader is not thread-safe and might be the cause of your issue.

Please share an example so we can understand the problem, here is an example with mongdb: https://github.com/spring-projects/spring-batch/blob/main/spring-batch-core/src/test/java/org/springframework/batch/core/repository/support/MongoDBJobRepositoryIntegrationTests.java