Hi Carlo, On Wed, Oct 8, 2014 at 1:46 AM, <[email protected]> wrote:
> Thanks for your continued support and excellent work on this great product. > > We have 20+ customers in the field on ApacheDS M16. The vast majority of > them have been using it the last 6 months without issue. > However in a few of the larger installs, where there are 4-6 application > servers, we've had some trouble. > On a dozen or so occasions, partitions have randomly become inoperable. > The only recourse in these cases is to restore the partitions from a backup. > I'm pretty sure this is due to the concurrency challenges Emmanuel has > explained in emails over the past year. > > When this situation occurs there is a prolonged downtime as we work with > the customers to restore. > As one might expect, we're getting pressure for answers and so I'm looking > for some guidance. > > A few questions: > Would upgrading our installed base to M17 lessen exposure to this > concurrency situation? > > not much > Should we sit tight and wait for another release that may offer additional > guard conditions or something more to address this? > > I suggest you wait till M18 comes out, I have been using the current trunk(M18) on a large number of production servers (mostly cause I am familiar with the internals) This version has significant improvements that lessen but not completely avoid the concurrency issues. Note that there is _no_ data loss due to this issue and generally building the indices fixes the problem. I have a tool that re-builds all these indices which is not yet opensourced, I will check if this can be released under ASL2. > I know there is an effort to replace JDBM with a Mavibot backend, is this > something we can look for in 3, 6, 12 months? > > Mavibot release is currently waiting on me, I am working on it and will update this list as soon as I complete it, say like under 6 months in the worst case. > On this side, there is a significant cost to uplift these customers so > we'd rather not do it twice. > However, we saw that M16 is no longer available for download so we're > trying to determine our best path forward. > > we may release M18 in the coming weeks, and again I suggest you upgrade to this before migrating to Mavibot based version (which will be released after M18) > Many thanks, Carlo Accorsi > > thank you -- Kiran Ayyagari http://keydap.com
