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https://issues.apache.org/jira/browse/LUCENE-7289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15305012#comment-15305012
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Steve Rowe commented on LUCENE-7289:
------------------------------------
My Jenkins found a reproducing seed for a {{TestHalfFloatPoint.testRounding()}}
failure:
{noformat}
Checking out Revision 2391b5b81dfade413d70d26da63e85cbd7245bf2
(refs/remotes/origin/master)
[...]
[junit4] Suite: org.apache.lucene.document.TestHalfFloatPoint
[junit4] 2> NOTE: download the large Jenkins line-docs file by running 'ant
get-jenkins-line-docs' in the lucene directory.
[junit4] 2> NOTE: reproduce with: ant test -Dtestcase=TestHalfFloatPoint
-Dtests.method=testRounding -Dtests.seed=337CEB28FDBC3420 -Dtests.slow=true
-Dtests.linedocsfile=/home/jenkins/lucene-data/enwiki.random.lines.txt
-Dtests.locale=ar-OM -Dtests.timezone=Pacific/Pohnpei -Dtests.asserts=true
-Dtests.file.encoding=UTF-8
[junit4] FAILURE 0.54s J8 | TestHalfFloatPoint.testRounding <<<
[junit4] > Throwable #1: java.lang.AssertionError
[junit4] > at
__randomizedtesting.SeedInfo.seed([337CEB28FDBC3420:D64E2AF1B93BB3BF]:0)
[junit4] > at
org.apache.lucene.document.TestHalfFloatPoint.testRounding(TestHalfFloatPoint.java:108)
[junit4] > at java.lang.Thread.run(Thread.java:745)
[junit4] 2> NOTE: test params are: codec=Asserting(Lucene62): {},
docValues:{}, maxPointsInLeafNode=982, maxMBSortInHeap=7.016444684690926,
sim=ClassicSimilarity, locale=ar-OM, timezone=Pacific/Pohnpei
[junit4] 2> NOTE: Linux 4.1.0-custom2-amd64 amd64/Oracle Corporation
1.8.0_77 (64-bit)/cpus=16,threads=1,free=481511712,total=514850816
[junit4] 2> NOTE: All tests run in this JVM: [TestPayloadSpanUtil,
TestBigIntegerPoint, TestHalfFloatPoint]
[junit4] Completed [5/18 (1!)] on J8 in 1.05s, 9 tests, 1 failure <<<
FAILURES!
{noformat}
> Half floats
> -----------
>
> Key: LUCENE-7289
> URL: https://issues.apache.org/jira/browse/LUCENE-7289
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 6.1, master (7.0)
>
> Attachments: LUCENE-7289.patch, LUCENE-7289.patch
>
>
> When it comes to indexing floating-point data, doubles and floats are quite
> space-intensive even though full precision is rarely needed. So maybe we
> should consider exposing half floats?
> Half floats have 5 bits for the exponent and 11 bits (including the implicit
> bit) for the mantissa so the minimum value is ~6x10^−8^, the maximum is
> 65504 and they can represent all integers between -2048 and 2048 accurately.
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