Typeorm becomes unresponsive when i execute bulk findOne queries in parallel

Issue type:

[ ] question [x] bug report [ ] feature request [ ] documentation issue

Database system/driver:

[ ] cordova [ ] mongodb [ ] mssql [ ] mysql / mariadb [ ] oracle [x] postgres [ ] sqlite [ ] sqljs [ ] react-native [ ] expo

TypeORM version:

[ ] latest [x] @next [ ] 0.x.x (or put your version here)

Steps to reproduce or a small repository showing the problem:

Hi,

I have the following function that i am calling 100 times in parallel:

export const findByCityNameAndStateId = async (cityName: string, stateId: number):
  Promise<City | undefined> => {
  return getRepository(City).findOne({
    where: {
      value: cityName,
      state: {
        id: stateId
      }
    },
    relations: ['state']
  });
};

The problem is that Typeorm starts to behave erratically when i execute this method in parallel a 100 times and does not return. And i have noticed this behavior on and off in alot of other methods. I even tried replacing findOne with find and a query builder but the same problem existed.

The problem went away when i reduced the number of parallel executions from 100 to 10.

My question is that am i doing something wrong here or does this problem exist in Typeorm?

Looking forward to hearing on this!

[HussainAliAkbar]

@havenchyk i got stuck in work and forgot to create a barebones repository. I’ll make it over the weekend.

[sahebte]

I have faced same issue on typeorm 0.2.34