Hi,

> We are trying to use H2 in process database in clustered mode, but
> found from documentation that it is not supported.
> Is there a reason for not doing so?

Yes, it's not so easy to implement.

> Can't db files be shared between multiple instances of h2 in-process
> databases?

There is a feature:
http://h2database.com/html/advanced.html#file_locking_serialized

However, the database file are only used by one process at any time.

> If not can we write a plug-gable shared file system which uses a
> shared file and used by multiple h2 instances?

No.

> Are there any issues with this kind of implementation?

Yes. Microsoft Access supports it, search for "microsoft access
multi-user disadvantages" on the internet, I'm sure you will find the
explanation.

Regards,
Thomas

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