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Re: Page Leak?



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>> 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/
> 


-- 
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/