Description

Thelmdb driver of DBA always sets theMDB_NOSUBDIR flag and does not allow PHP code to override it:

This is a problem for interoperability when sharing a single LMDB database between multiple programs written in different languages. LMDB itself defaults to using a subdirectory as a database, and will create two filesdata.mdb andlock.mdb in this directory. When using PHP, one has to opensubdir/data.mdb explicitly, but now the PHP code will usesubdir/data.mdb-lock instead ofsubdir/lock.mdb as a lock file, leading to two separate lock files when using different codebases:

host ~/test (master) # ls -l pkg.dbtotal 156K-rw------- 1 root root 148K Jun 22 16:49 data.mdb-rw------- 1 root root 8.0K Jun 23 19:30 lock.mdb-rw-r--r-- 1 root root 8.0K Jun 22 18:49 data.mdb-lock

Currently, the only way to work around this issue is by changing all other codebases to useMDB_NOSUBDIR too because there is no way to disable it in PHP.