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https://issues.apache.org/jira/browse/LUCENE-3760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204634#comment-13204634
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Eks Dev commented on LUCENE-3760:
---------------------------------
I have a use case for CommitUserData and I think standard solr DIH could
benefit from it as well.
I use it to persist current status of the max Document id (user id, not lucene
docid) to know what I have indexed so far (all update commands are stored in
the database and have simple incrementing counter). This makes incremental
update process "restart- and rollback- safe" as it gets written on lucene
commit and read on startup. I do not index this field (not to pollute term
dictionary) and I need only to keep max value of it.
I find it hugely useful, but if you have better ideas on how to safely persist
max/min value of the field I am all ears.
Last time I checked, solr DIH used its own file in cfg directory to persist
max(timestamp), which is kind of risky as it is not in sync with lucene commit
point under all scenarios.
I think I even opened an isue on solr jira to expose "user commit data"
feature to solr, but I am missing good ideas on how to expose it to solr users
(max/min/avg field tracking maybe)...
Cheers, eks
> Cleanup DR.getCurrentVersion/DR.getUserData/DR.getIndexCommit().getUserData()
> -----------------------------------------------------------------------------
>
> Key: LUCENE-3760
> URL: https://issues.apache.org/jira/browse/LUCENE-3760
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3760.patch, LUCENE-3760.patch
>
>
> Spinoff from Ryan's dev thread "DR.getCommitUserData() vs
> DR.getIndexCommit().getUserData()"... these methods are confusing/dups right
> now.
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