Re: (ITS#5391) hdb deadlock

[hyc@symas.com]

Hallvard B Furuseth wrote:
> hyc@symas.com writes:
>> One thing that I've started doing recently in my configs is to skip
>> the #bytes option (leave it zero), so that only time-based checkpoints
>> occur. Since they're done in a dedicated task, only one thread at a
>> time can trigger a checkpoint.
>
> How about making #bytes-based checkpoints signal or (pthread_kill?) the
> timed checkpoints thread, so that thread can handle all checkpoints?

It's an interesting idea. But that means we have to count bytes ourselves, 
rather than letting BerkeleyDB do it. And that's rather difficult, since we 
don't know the actual volume of writes resulting from a given operation. 
Personally I don't think byte counts are very useful here. They're made 
somewhat superfluous because the data volume will tend to cause the 
transaction log buffers to fill up and be flushed regardless.
-- 
   -- Howard Chu
   Chief Architect, Symas Corp.  http://www.symas.com
   Director, Highland Sun        http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP     http://www.openldap.org/project/