sigram commented on code in PR #2666:
URL: https://github.com/apache/solr/pull/2666#discussion_r1731349309
##########
solr/CHANGES.txt:
##########
@@ -109,8 +109,11 @@ New Features
Improvements
---------------------
+* SOLR-17158: Users for whom partial results are uninteresting may set
partialResultsAllowed=false. This allows Solr to reduce time spent processing
partial results and omit them from the response. (Gus Heck, Andrzej Bialeki,
hossman)
Review Comment:
Typo - my last name is Bialecki :) or actually Białecki where non-ascii is
allowed, but I've been using both forms.
##########
solr/core/src/java/org/apache/solr/response/SolrQueryResponse.java:
##########
@@ -139,30 +142,63 @@ public ReturnFields getReturnFields() {
/**
* If {@link #getResponseHeader()} is available, set {@link
#RESPONSE_HEADER_PARTIAL_RESULTS_KEY}
- * flag to true.
+ * attribute to true or "omitted" as required.
*/
- public void setPartialResults() {
+ public void setPartialResults(SolrQueryRequest req) {
Review Comment:
Should this be `static` now?
##########
solr/core/src/java/org/apache/solr/response/SolrQueryResponse.java:
##########
@@ -61,7 +64,7 @@
*/
public class SolrQueryResponse {
public static final String NAME = "response";
- public static final String RESPONSE_HEADER_PARTIAL_RESULTS_KEY =
CommonParams.PARTIAL_RESULTS;
Review Comment:
Originally I did this on purpose to avoid getting these two strings out of
sync.
##########
solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc:
##########
@@ -71,6 +71,13 @@ Due to changes in Lucene 9, that isn't possible any more.
=== Configuration
In solrconfig.xml, the `numVersionBuckets` and `versionBucketLockTimeoutMs`
settings are now obsolete and ignored; a warning will be logged if specified.
+=== Partial Results
+When solr is used for reporting, legal discovery or other use cases that
cannot accept partial results, yet it still needs to be protected from
long-running queries, users may now opt out of receiving partial results.
+This feature should eliminate some wasted processing and bandwidth, as well as
simplifying client side logic, and reducing the chance of inappropriate
responses to the user.
+This can be enabled either via a request parameter (`allowPartialResults`),
environment variable or system property.
+The partialResults attribute in the request header will now have three
possible states: `"true"`, `"omitted"` or absent, with the new `"omitted"`
value indicating the difference between a timed out request with results
omitted due to query limits and results that are merely empty because the query
didn't match any docs.
Review Comment:
Somehow this sentence is very confusing to me ... maybe this: the new
"omitted" value indicating that query returned partial results, which due to
the setting were not allowed and they were then discarded? or something more
English-like ;)
##########
solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc:
##########
@@ -71,6 +71,13 @@ Due to changes in Lucene 9, that isn't possible any more.
=== Configuration
In solrconfig.xml, the `numVersionBuckets` and `versionBucketLockTimeoutMs`
settings are now obsolete and ignored; a warning will be logged if specified.
+=== Partial Results
+When solr is used for reporting, legal discovery or other use cases that
cannot accept partial results, yet it still needs to be protected from
long-running queries, users may now opt out of receiving partial results.
Review Comment:
long-running queries -> queries exceeding limits ?
##########
solr/core/src/java/org/apache/solr/response/SolrQueryResponse.java:
##########
@@ -139,30 +142,63 @@ public ReturnFields getReturnFields() {
/**
* If {@link #getResponseHeader()} is available, set {@link
#RESPONSE_HEADER_PARTIAL_RESULTS_KEY}
- * flag to true.
+ * attribute to true or "omitted" as required.
*/
- public void setPartialResults() {
+ public void setPartialResults(SolrQueryRequest req) {
NamedList<Object> header = getResponseHeader();
- if (header != null
- && header.get(SolrQueryResponse.RESPONSE_HEADER_PARTIAL_RESULTS_KEY)
== null) {
- header.add(SolrQueryResponse.RESPONSE_HEADER_PARTIAL_RESULTS_KEY,
Boolean.TRUE);
+ if (header != null) {
+ if (header.get(SolrQueryResponse.RESPONSE_HEADER_PARTIAL_RESULTS_KEY) ==
null) {
+ Object value =
partialResultsStatus(shouldDiscardPartials(req.getParams()));
+ header.add(SolrQueryResponse.RESPONSE_HEADER_PARTIAL_RESULTS_KEY,
value);
+ }
}
}
+ public static Object partialResultsStatus(boolean discarding) {
+ return discarding ? "omitted" : Boolean.TRUE;
Review Comment:
Should this be a constant somewhere?
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