Bonjour,

In the past weeks a few mailing list threads[0][1][2] explored the problem of 
storing billions of small objects in Ceph. There was great feedback (I learned 
at lot) and it turns out the solution is a rather simple aggregation of the 
ideas that were suggested during these discussions. It is described in detail 
here:

   
https://wiki.softwareheritage.org/wiki/A_practical_approach_to_efficiently_store_100_billions_small_objects_in_Ceph

The next step will be to write and run benchmarks[3]. Although I'm convinced it 
is a good solution, I've been wrong before and confirmation is required :-) 
Many thanks to all the participants in the discussions on behalf of the 
Software Heritage project[4].

Cheers

[0] Storing 20 billions of immutable objects in Ceph, 75% <16KB 
https://lists.ceph.io/hyperkitty/list/[email protected]/thread/JSG2TXKNXPXEKZOJZGYF2ZPTQHOB4LHJ/
[1] Small RGW objects and RADOS 64KB minimun size 
https://lists.ceph.io/hyperkitty/list/[email protected]/thread/AEMW6O7WVJFMUIX7QGI2KM7HKDSTNIYT/
[2] Using RBD to pack billions of small files 
https://lists.ceph.io/hyperkitty/list/[email protected]/thread/RHQ5ZCHJISXIXOJSH3TU7DLYVYHRGTAT/
[3] https://forge.softwareheritage.org/T3054
[4] https://www.softwareheritage.org/

-- 
Loïc Dachary, Artisan Logiciel Libre


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