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Re: Page Leak?
Andrew Spott wrote:
> Can I use `mdb_dump | mdb_load` (roughly) to get the db back to a stable state? Any ideas what is going on? I have no idea how to reproduce this bug, so I'm
> not sure what to put in a bug report... and I can't share the db.
Yes, mdb_dump feeding mdb_load should give you a stable DB.
>
> -Andrew
>
> On Tue, Nov 19, 2019 at 1:23 PM Andrew Spott <andrew.spott@gmail.com <mailto:andrew.spott@gmail.com>> wrote:
>
> mdb_dump didn't complain.
>
> -Andrew
>
> On Tue, Nov 19, 2019 at 9:49 AM Howard Chu <hyc@symas.com <mailto:hyc@symas.com>> wrote:
>
> Andrew Spott wrote:
> > When looking at the code for mdb_env_copyfd1 (the copy with compaction function), there is this clause[0]:
> >
> > if (rc == MDB_SUCCESS && root != new_root) {
> > rc = MDB_INCOMPATIBLE; /* page leak or corrupt DB */
> > }
> >
> >
> > Since this happens at the end of the function, and I'm seeing the mdb_copy -c takes a while, I figured this was the error that I was seeing.
> >
> > If this isn't it, then what am I looking at? If it is a corrupt DB, is there anything I can do to figure out how to fix this?
>
> Try using mdb_dump to get a backup instead, see if it succeeds or complains.
> >
> > [0] https://github.com/LMDB/lmdb/blob/c3e6b4209eed13af4a3670e5f04f42169c08e5c6/libraries/liblmdb/mdb.c#L10311-L10312
> >
> > -Andrew
> >
> > On Sat, Nov 16, 2019 at 7:24 AM Howard Chu <hyc@symas.com <mailto:hyc@symas.com> <mailto:hyc@symas.com <mailto:hyc@symas.com>>> wrote:
> >
> > Andrew Spott wrote:
> > > I apologize if this is the wrong place to ask this, let me know if there is someplace better.
> > >
> > > So, when doing a `mdb_copy -c`, I've run into the error message:
> > >
> > > mdb_copy: copying failed, error -30784 (MDB_INCOMPATIBLE: Operation and DB incompatible, or DB flags changed)
> > >
> > > When looking at the mdb_copy man page, it says that mdb_copy with compaction might fail if the database has a 'page leak'.
> > >
> > > Since that appears to be what has happened...
> >
> > The error message you got has nothing to do with a page leak.
> >
> > > can anyone tell me what that means? Does this mean that the data could be corrupted? How do I fix this?
> > >
> > > Thanks!
> > >
> > > -Andew
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/