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From "Michael Busch (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2881) Track FieldInfo per segment instead of per-IW-session
Date Wed, 16 Feb 2011 07:26:57 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Busch updated LUCENE-2881:
----------------------------------

    Attachment: lucene-2881.patch

I fixed a bug in FieldInfos that could lead to wrong field numbers, that might have been related
to the wrong behavior you're seeing, Simon.

About codecIds:  I made the fix to FieldInfo.clone() to set the codecId on the clone.  I also
made FieldInfo.codecId private and added getter and setter.  The setter checks whether the
new value for codecId is different from the previous one, and throws in exception in that
case (unless it was set to the default 0 before, which I think means Preflex codec).

All tests pass.  Please let me know if that fixes your problem.  If not then you should at
least see the new exception that I added, which might make debugging easier.

> Track FieldInfo per segment instead of per-IW-session
> -----------------------------------------------------
>
>                 Key: LUCENE-2881
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2881
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: Realtime Branch, CSF branch, 4.0
>            Reporter: Simon Willnauer
>            Assignee: Michael Busch
>             Fix For: Realtime Branch, CSF branch, 4.0
>
>         Attachments: lucene-2881.patch, lucene-2881.patch, lucene-2881.patch, lucene-2881.patch
>
>
> Currently FieldInfo is tracked per IW session to guarantee consistent global field-naming
/ ordering. IW carries FI instances over from previous segments which also carries over field
properties like isIndexed etc. While having consistent field ordering per IW session appears
to be important due to bulk merging stored fields etc. carrying over other properties might
become problematic with Lucene's Codec support.  Codecs that rely on consistent properties
in FI will fail if FI properties are carried over.
> The DocValuesCodec (DocValuesBranch) for instance writes files per segment and field
(using the field id within the file name). Yet, if a segment has no DocValues indexed in a
particular segment but a previous segment in the same IW session had DocValues, FieldInfo#docValues
will be true  since those values are reused from previous segments. 
> We already work around this "limitation" in SegmentInfo with properties like hasVectors
or hasProx which is really something we should manage per Codec & Segment. Ideally FieldInfo
would be managed per Segment and Codec such that its properties are valid per segment. It
also seems to be necessary to bind FieldInfoS to SegmentInfo logically since its really just
per segment metadata.  

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