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https://issues.apache.org/jira/browse/SOLR-17058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17820504#comment-17820504
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wei wang commented on SOLR-17058:
---------------------------------
Thanks Mikhail. Looks somehow in my local test LRUStatsCache case is not
triggered. Yes I think QueryResultKey is restricted to local subordinate use
as if used on coordinator, data change on the subordinate nodes would
invalidate the results? Also can you elaborate what other effects shall I
test for the QueryResultKey?
> Request param to disable distributed stats request at query time
> ----------------------------------------------------------------
>
> Key: SOLR-17058
> URL: https://issues.apache.org/jira/browse/SOLR-17058
> Project: Solr
> Issue Type: New Feature
> Components: query
> Reporter: wei wang
> Assignee: Mikhail Khludnev
> Priority: Minor
> Fix For: 9.6.0
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> When distributed IDF is enabled in solr cloud by adding one of the cache
> implementations in solrconfig.xml
> [https://solr.apache.org/guide/solr/latest/deployment-guide/solrcloud-distributed-requests.html#distributedidf],
> each solr query will incur a distributed shard request to get term
> statistics
> "debug": {
> "track": {
> "rid": "-54",
> "PARSE_QUERY": {
> "http://192.168.0.34:8987/solr/shard2_replica_n1/":
> { "QTime": “2”,
>
> "ElapsedTime": "13",
>
> "RequestPurpose": "GET_TERM_STATS",
> …
>
> For queries that does not use distributed IDF information for scoring
> such as terms filter by id, the stats request is not necessary. Hence I
> propose to add a {{distrib.statsCache}} request param so that the distributed
> stats request can be disabled at query time.
> # {{distrib.statsCache}} defaults to {{{}true{}}}. When the param is not
> present, there is no change to current distributed IDF behavior.
> # When explicitly set {{{}distrib.statsCache{}}}{{{}=false{}}}, distributed
> stats call is disabled for the current query.
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