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From "Robert Muir (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (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:all-tabpanel
]

Robert Muir updated LUCENE-3647:
--------------------------------

    Attachment: LUCENE-3647_multi.patch

hmm my debugging there is a little bogus (just ignore the previous file, you can use the existing
test with taht seed), but i think the synopsis is still correct.

I think as a start, don't we need to be careful when handling these fixed types in all places?
Here's a patch for MultiDocValues that should fix some bugs related to this (unfortunately
the seed still fails).

MultiDocValues isnt actually used during merging so we need to investigate other parts too
and probably do the same?
                
> 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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