Follow-up: Riak / Map, Reduce - error [preflist_exhausted]

claudef at claudef at
Tue Jun 5 09:51:43 EDT 2012

Dear colleagues, 

Any idea how to adjust the processing capacity of the Riak JavaScript in 
the Map / Reduce process to avoid the error [preflist_exhausted] ? 
Checking the user posts, I also see a similar error report sent at 29/05 
by Mr. Sati, Hohit. 

The Map/Reduce and search capability are interesting features, mainly when 
it comes to the analysis of unstructured data. 
Thanks in advance for your hints. 


----- Forwarded by Claude Falbriard/Brazil/IBM on 05/06/2012 10:44 -----

From:   claudef at
To:     riak-users at
Date:   24/05/2012 10:01
Subject:        Riak / Map, Reduce - error [preflist_exhausted]
Sent by:        riak-users-bounces at

Dear colleagues, 

The map reduce process via JavaScript shows an error [preflist_exhausted] 
when doing larger queries on unstructured data.  Up to to 500 keys, the 
queries run OK, but when going to 5000 keys in a bucket the error starts 
to apear. My version is kv 1.1.2 (git).  I would like to use the 
Javascript procedures as it delivers more powerful pattern search behavior 
compared to the Lucene like search syntax function.   

I've already tried the following adjustments in the app.config file   

            {map_js_vm_count, 24 }, 
            {reduce_js_vm_count, 18 }, 
            {js_max_vm_mem, 48}, 

Any hint where to start the tuning to avoid this error? 


Claude Falbriard 
Certified IT Specialist L2 - Middleware
AMS Hortolândia / SP - Brazil
phone:    +55 19 9837 0789
cell:         +55 13 8117 3316
e-mail:    claudef at
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