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(ITS#7994) [LMDB] Feature Request: Access to current transaction ID.

Full_Name: David Barbour
Version: LMDB 0.9.10
OS: Ubuntu
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (2602:306:80bb:160:d913:da7:da0f:76b3)

As discussed on the list [1], I believe access to the current transaction ID
could be very useful for layering features above LMDB, such as concurrent
writers, read-only to read-write promotion, or serving as an e-tag for polling.

A patch David-Barbour-141205.patch has been uploaded and includes a disclaimer
to public-domain.

[1] http://www.openldap.org/lists/openldap-devel/201412/msg00000.html