X-Git-Url: http://jsfdemo.indexdata.com/?a=blobdiff_plain;f=NEWS;h=946f3f45d8df17cd0bd69e081e585ef631d863bb;hb=f75dc6076c0d4846d80929c40894bb4fdd678dc2;hp=0611b786680901972a06b8e6c576fb6d14355744;hpb=446f32183265d59ee79e2859376c598fa24408e0;p=pazpar2-moved-to-github.git

diff --git a/NEWS b/NEWS
index 0611b78..946f3f4 100644
--- a/NEWS
+++ b/NEWS
@@ -1,12 +1,34 @@
+--- 1.6.22 2012/10/11
+
+Requires YAZ-4.2.40 to support native solr support. 
+
+Fix and improve logic handling whether or not to re-do search on sort 
+order changes. A sort order with change in ascending/descending only 
+whould not trigger a new search, which is required for targets with 
+native sorting capabilities. Each client is now checked if instructions
+(sortmap) exist for native sorting and only client that does requires 
+it is researched. Other clients is just re-ingesting the records, 
+they already have. The resultset is now cleared if any researching 
+is done. 
+
+Connection sharing between session has broken since version 1.6.8 with 
+introduction of logic that would minimize searching if pazpar2 could 
+detect this based on same query and limits and partly sort order. 
+This could lead to segementations violations.
+
+Added a chapter in the manaul about relevance ranking.
+
+--- 1.6.21 2012/09/24
 
 Rank tweak: follow=number will increase mult by number if two terms
 occur next to each other; number-1 if they are one term apart , .. 0
 if they are number a part (all in order). Default is 0 (following
 terms has no effect).
 
-Rank tweak: lead=number will increase mult by number if term is first
-term in field, number-1 if second, ... 0 if term is at offset
-number of more. Default value is 0 (position irrelevant).
+Rank tweak: lead=k will divide mult by 1 + log2(1+k*l) where k is
+value given by lead and l is length from beginning of field where
+term occurs (l=0 for first term, l=1 for second term, ..). Default
+value of k is 0.0.
 
 Rank tweak: length=strategy. length="linear" if mult is to be divided
 by length (existing, default behavior), length="log" if mult is to be 
@@ -15,7 +37,7 @@ by length.
 
 --- 1.6.20 2012/09/21
 
-Rank algorithm details may be printed as part of show reseponse in
+Rank algorithm details may be printed as part of show response in
 element <relevance_info>.. This is only printed if <rank debug="yes"/>
 is used in service.