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Posted to issues@solr.apache.org by "ASF subversion and git services (Jira)" <ji...@apache.org> on 2022/10/26 22:01:00 UTC
[jira] [Commented] (SOLR-10918) Hashing for IntPointFields is broken for HLL
[ https://issues.apache.org/jira/browse/SOLR-10918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17624772#comment-17624772 ]
ASF subversion and git services commented on SOLR-10918:
--------------------------------------------------------
Commit 282fb99e1481c2366dbf8446acaad8ba482229fd in solr's branch refs/heads/main from Houston Putman
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=282fb99e148 ]
SOLR-10918: Fix IntPointField hashing for HLL (#1137)
> Hashing for IntPointFields is broken for HLL
> --------------------------------------------
>
> Key: SOLR-10918
> URL: https://issues.apache.org/jira/browse/SOLR-10918
> Project: Solr
> Issue Type: Bug
> Reporter: Chris M. Hostetter
> Assignee: Houston Putman
> Priority: Major
> Labels: numeric-tries-to-points
> Time Spent: 20m
> Remaining Estimate: 0h
>
> discovered as part of SOLR-10807...
> when using Points based numerics, the HLL estimates using the raw values vs the hashed values disagree slightly -- this suggests some possible bug (or the very least: room for optimization) when using Points fields.
> Example from SOLR-10807 when swaping IntPointField in place of TrieIntField...
> {code}
> [junit4] 2> NOTE: reproduce with: ant test -Dtestcase=TestDistributedStatsComponentCardinality -Dtests.method=test -Dtests.seed=63854996088ED7B7 -Dtests.slow=true -Dtests.locale=de-GR -Dtests.timezone=Etc/UCT -Dtests.asserts=true -Dtests.file.encoding=ISO-8859-1
> [junit4] FAILURE 13.3s J2 | TestDistributedStatsComponentCardinality.test <<<
> [junit4] > Throwable #1: java.lang.AssertionError: int_i: hashed vs prehashed, real=7260, p=q=id:[1186+TO+8445]&rows=0&stats=true&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8}int_i&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8+hllPreHashed%3Dtrue}int_i_prehashed_l&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8}long_l&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8+hllPreHashed%3Dtrue}long_l_prehashed_l&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8}string_s&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8+hllPreHashed%3Dtrue}string_s_prehashed_l expected:<6632> but was:<7929>
> [junit4] > at __randomizedtesting.SeedInfo.seed([63854996088ED7B7:EBD1764CA672BA4F]:0)
> [junit4] > at org.apache.solr.handler.component.TestDistributedStatsComponentCardinality.test(TestDistributedStatsComponentCardinality.java:149)
> {code}
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