Changeset 36794 for main/trunk/greenstone2/common-src

Timestamp:

2022-10-13T19:21:02+13:00 (20 months ago)

Author:

anupama

Message:

Dr Bainbridge fixed a diffcol classifier's subsidiary documents ordering issue: for identical titles under an authorr bookshelf for AZCompactList classifier on Creators in Word-PDF-Basic tutorial model collection, a different order of the documents would appear each time. The solution was 2-fold: Besides the PERL_PERTURB_KEYS environment variable, which we set to 0, there is also the PERL_HASH_SEED (see ​https://www.perlmonks.org/?node_id=1167787 ), and they both need to be set to 0 to get consistent ordering when calling perl's 'keys' command on a hashmap. The other part of the solution is to initialise AZCompactList's sort property to 'nosort' which then uses an array (thus, having a sense of ordering) instead of AZCompactList's default behaviour of using a hashmap (which does not enforce a sense of ordering). Setting the sort property to nosort had the effect of a consistent order of the same identically Titled documents upon a single build, but no consistent ordering between builds which is what PERL_PERTURB_KEYS in conjunction with PERL_HASH_SEED ensure.

File:

• main/trunk/greenstone2/common-src/cgi-bin/gsdlCGI.pm (modified) (1 diff)

main/trunk/greenstone2/common-src/cgi-bin/gsdlCGI.pm

@@ -704 +704 @@
     }
 
-    # If perl_perturb_keys isn't set, then search results with remote GS
-    # return different documents from the ones that should be returned
+    # If perl_perturb_keys and related perl_hash_seed aren't set, then search results
+    # with remote GS return different documents from the ones that should be returned
     $ENV{'PERL_PERTURB_KEYS'}=0;
+    $ENV{'PERL_HASH_SEED'}=0;
     $ENV{'WGETRC'}=&FileUtils::filenameConcatenate($gsdlhome,"bin",$gsdlos,"wgetrc");
 }