[pfx] Re: [heads up] lmdb 1.0

On 2026/07/05 16:49, Christian Pfeiffer via Postfix-users wrote:
> I had already posted on here a couple of days ago on the matter but it 
> got missed or so

Hi Christian,

Yes, you had already flagged this -- thank you!. My apologies, I had 
forgotten already and replied to today's thread.

> The patch I made for Arch downstream patch that has been in this thread already
> does precisely that.

I'm not sure it does. On line 50 of the gist you linked you have:

+        mdb_txn_abort(slmdb->txn);

The [docs for mdb_txn_abord] indicate that this will "Abandon all the 
operations of the transaction instead of saving them."

The [docs-for-mdb_drop] indicate that the dropping of a table is a 
'transaction'.

Put together: by using `mdb_txn_abort` that "drop" transaction does not 
get committed, but gets abandoned. That, I suppose, would also be the 
cause for the double entries: No dropping of the table, and when you 
rewrite the table, it keeps the original entries.

> However, there's still one more glitch or so with it that I haven't 
> debugged yet. That's why I had asked for comments in my mail a few days ago.
See above.

I hope this is correct, and helps!

Kind regards,
     Edmund Lodewijks


[docs-for-mdb_txn_abort]: 
http://www.lmdb.tech/doc/group__mdb.html#ga73a5938ae4c3239ee11efa07eb22b882

[docs-for-mdb_drop]: 
http://www.lmdb.tech/doc/group__mdb.html#gab966fab3840fc54a6571dfb32b00f2db


-- 
Edmund Lodewijks <[email protected]>
TZ: UTC+2 / GMT+2
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