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https://issues.apache.org/jira/browse/LUCENE-5215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13778764#comment-13778764
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Shai Erera commented on LUCENE-5215:
------------------------------------
bq. As long as its just bound by #formats and not influenced by generation
number, no reason to touch
Yes, the suffix isn't affected by the generation number. The generation is
appended to the filename, outside PerField.
{quote}
IMO we can then tackle the segmentinfos attributes issue (i recommend
removal/simple solution here) and get all this baking and devise a plan to get
this feature as a whole backported into our stable branch.
{quote}
I think we should finish this, handle SI.attributes (LUCENE-5216) and then
backport each issue separately, so that the commits are associated with the
respective issues. Still, do all the backports together, but just separate the
commmits according to the issues. What do you think?
> Add support for FieldInfos generation
> -------------------------------------
>
> Key: LUCENE-5215
> URL: https://issues.apache.org/jira/browse/LUCENE-5215
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/index
> Reporter: Shai Erera
> Assignee: Shai Erera
> Attachments: LUCENE-5215.patch, LUCENE-5215.patch, LUCENE-5215.patch,
> LUCENE-5215.patch, LUCENE-5215.patch, LUCENE-5215.patch, LUCENE-5215.patch
>
>
> In LUCENE-5189 we've identified few reasons to do that:
> # If you want to update docs' values of field 'foo', where 'foo' exists in
> the index, but not in a specific segment (sparse DV), we cannot allow that
> and have to throw a late UOE. If we could rewrite FieldInfos (with
> generation), this would be possible since we'd also write a new generation of
> FIS.
> # When we apply NDV updates, we call DVF.fieldsConsumer. Currently the
> consumer isn't allowed to change FI.attributes because we cannot modify the
> existing FIS. This is implicit however, and we silently ignore any modified
> attributes. FieldInfos.gen will allow that too.
> The idea is to add to SIPC fieldInfosGen, add to each FieldInfo a dvGen and
> add support for FIS generation in FieldInfosFormat, SegReader etc., like we
> now do for DocValues. I'll work on a patch.
> Also on LUCENE-5189, Rob raised a concern about SegmentInfo.attributes that
> have same limitation -- if a Codec modifies them, they are silently being
> ignored, since we don't gen the .si files. I think we can easily solve that
> by recording SI.attributes in SegmentInfos, so they are recorded per-commit.
> But I think it should be handled in a separate issue.
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