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https://issues.apache.org/jira/browse/SOLR-12343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16518698#comment-16518698
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Steve Rowe commented on SOLR-12343:
-----------------------------------
Not sure if it relates to this bug -- please move/add if not -- but my Jenkins
found a reproducing failure for {{TestCloudJSONFacetSKG.testBespoke()}}:
{noformat}
Checking out Revision 008bc74bebef96414f19118a267dbf982aba58b9
(refs/remotes/origin/master)
[...]
ant test -Dtestcase=TestCloudJSONFacetSKG -Dtests.method=testBespoke
-Dtests.seed=5D223D88BF5BF89 -Dtests.slow=true -Dtests.locale=bg-BG
-Dtests.timezone=America/Asuncion -Dtests.asserts=true
-Dtests.file.encoding=ISO-8859-1
[junit4] FAILURE 0.11s J0 | TestCloudJSONFacetSKG.testBespoke <<<
[junit4] > Throwable #1: java.lang.AssertionError: Didn't check a single
bucket???
[junit4] > at
__randomizedtesting.SeedInfo.seed([5D223D88BF5BF89:E09A7E14375787E]:0)
[junit4] > at
org.apache.solr.cloud.TestCloudJSONFacetSKG.testBespoke(TestCloudJSONFacetSKG.java:219)
[junit4] > at java.lang.Thread.run(Thread.java:748)
[...]
[junit4] 2> NOTE: test params are:
codec=FastCompressingStoredFields(storedFieldsFormat=CompressingStoredFieldsFormat(compressionMode=FAST,
chunkSize=4, maxDocsPerChunk=1, blockSize=332),
termVectorsFormat=CompressingTermVectorsFormat(compressionMode=FAST,
chunkSize=4, blockSize=332)),
sim=Asserting(org.apache.lucene.search.similarities.AssertingSimilarity@4052d535),
locale=el, timezone=Indian/Antananarivo
[junit4] 2> NOTE: Linux 4.1.0-custom2-amd64 amd64/Oracle Corporation
1.8.0_151 (64-bit)/cpus=16,threads=1,free=213710424,total=526909440
{noformat}
> JSON Field Facet refinement can return incorrect counts/stats for sorted
> buckets
> --------------------------------------------------------------------------------
>
> Key: SOLR-12343
> URL: https://issues.apache.org/jira/browse/SOLR-12343
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
> Priority: Major
> Attachments: SOLR-12343.patch, SOLR-12343.patch, SOLR-12343.patch
>
>
> The way JSON Facet's simple refinement "re-sorts" buckets after refinement
> can cause _refined_ buckets to be "bumped out" of the topN based on the
> refined counts/stats depending on the sort - causing _unrefined_ buckets
> originally discounted in phase#2 to bubble up into the topN and be returned
> to clients *with inaccurate counts/stats*
> The simplest way to demonstrate this bug (in some data sets) is with a
> {{sort: 'count asc'}} facet:
> * assume shard1 returns termX & termY in phase#1 because they have very low
> shard1 counts
> ** but *not* returned at all by shard2, because these terms both have very
> high shard2 counts.
> * Assume termX has a slightly lower shard1 count then termY, such that:
> ** termX "makes the cut" off for the limit=N topN buckets
> ** termY does not make the cut, and is the "N+1" known bucket at the end of
> phase#1
> * termX then gets included in the phase#2 refinement request against shard2
> ** termX now has a much higher _known_ total count then termY
> ** the coordinator now sorts termX "worse" in the sorted list of buckets
> then termY
> ** which causes termY to bubble up into the topN
> * termY is ultimately included in the final result _with incomplete
> count/stat/sub-facet data_ instead of termX
> ** this is all indepenent of the possibility that termY may actually have a
> significantly higher total count then termX across the entire collection
> ** the key problem is that all/most of the other terms returned to the
> client have counts/stats that are the cumulation of all shards, but termY
> only has the contributions from shard1
> Important Notes:
> * This scenerio can happen regardless of the amount of overrequest used.
> Additional overrequest just increases the number of "extra" terms needed in
> the index with "better" sort values then termX & termY in shard2
> * {{sort: 'count asc'}} is not just an exceptional/pathelogical case:
> ** any function sort where additional data provided shards during refinement
> can cause a bucket to "sort worse" can also cause this problem.
> ** Examples: {{sum(price_i) asc}} , {{min(price_i) desc}} , {{avg(price_i)
> asc|desc}} , etc...
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