On 3/21/13 10:52 AM, Toke Eskildsen wrote:
On Thu, 2013-03-21 at 09:57 +0100, Per Steffensen wrote:
Thanks Toke! Can you please elaborate a little bit? How to use it? What
it is supposed to do for you?
Sorry, no, I only know about it on the abstract level. The release notes
for Solr 4.2 says
* DocValues have been integrated into Solr. DocValues can be loaded up a
lot faster than the field cache and can also use different compression
algorithms as well as in RAM or on Disk representations. Faceting,
sorting, and function queries all get to benefit. How about the OS
handling faceting and sorting caches off heap? No more tuning 60
gigabyte heaps? How about a snappy new per segment DocValues faceting
method? Improved numeric faceting? Sweet.
Spending 5 minutes searching on how to activate the new powers did not
get me much; my Google-fu is clearly not strong enough. The example
schema shows that docValues="true" is a valid attribute for "StrField,
UUIDField and all Trie*Fields", but I do not know if they are used
automatically by sort or if they should be requested explicitly.
Regards,
Toke Eskildsen
Thanks again, Toke!
Can anyone else elaborate? How to "activate" it? How to make sure, for
sorting, that sort-field-value for all docs are not read into memory for
sorting - leading to OOM when you have a lot of docs? Can this feature
be activated on top of an existing 4.0 index, or do you have to re-index
everything?
Thanks a lot for any feedback!
Regards, Per Steffensen
