Question

In order to debug an issue with our usage of Hibernate, I would like to disable Hibernate’s batch insert/update mechanism to use non-batched statements instead.

I know that I can set hibernate.jdbc.batch_size=1, but that still goes through the normal batching code with a batch size of 1.

Is there any way to completely turn off batch processing?

Answer 1

As far as I understand you want to avoid calling the PreparedStatement#addBatch(sql) method by Hibernate (and instead use dedicated statement instance for every operation). Unfortunately there is no easy way to do that. But… I have checked the Hibernate source code and it seems that Hibernate checks multiple conditions before running the update/insert operation. It decides wheter to use batch or not. Have a look at the method AbstractEntityPersister#update. There should be a line like this:

final boolean useBatch = j == 0 && expectation.canBeBatched() && isBatchable(); //note: updates to joined tables can't be batched...

One thing which you can do is to replace isBatchable() method by your own implementation which will always return false. By default it looks like this:

public boolean isBatchable() {
        return optimisticLockMode()==Versioning.OPTIMISTIC_LOCK_NONE ||
            ( !isVersioned() && optimisticLockMode()==Versioning.OPTIMISTIC_LOCK_VERSION ) ||
            getFactory().getSettings().isJdbcBatchVersionedData();
    } 

Therefore you could choose one of the following approaches:

• create your own implementation of EntityPersister
• replace the Hibernate source code
• tweak the configuration by setting the property hibernate.jdbc.batch_versioned_data = false and by setting locking mode for every entity which you have to OPTIMISTIC_LOCK_ALL.

As I said before not simple but possible.