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From "Simon Willnauer (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3647) DocValues merging is not associative, leading to different results depending upon how merges execute
Date Wed, 14 Dec 2011 12:37:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169289#comment-13169289
] 

Simon Willnauer commented on LUCENE-3647:
-----------------------------------------

my first guess is that this comes due to the different IWCs if you don't specify a value for
a field in one IW before the segment is flushed it will not write anything out. but if for
instance in your second IW the last doc in a seg has a value DV fills it with default values
for the other docs.  is that something which could happen here? Same is true if you merge
fields ie. if you have slightly different merge policies?


                
> DocValues merging is not associative, leading to different results depending upon how
merges execute
> ----------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3647
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3647
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Robert Muir
>         Attachments: LUCENE-3647_multi.patch, LUCENE-3647_test.patch
>
>
> recently I cranked up TestDuelingCodecs to actually test docvalues (previously it wasn't
testing it at all).
> This test is simple, it indexes the same random content with 2 different indexwriters,
it just allows them
> to use different codecs with different indexwriterconfigs.
> then it asserts the indexes are equal.
> Sometimes, always on BYTES_FIXED_DEREF type, we end out with one reader that has a zero-filled
byte[] for a doc,
> but that same document in the other reader has no docvalues at all.

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