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https://issues.apache.org/jira/browse/SOLR-2701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176422#comment-13176422
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Gregg Donovan commented on SOLR-2701:
-------------------------------------
We (Etsy) are interested in this issue for the same use-case that Eks Dev
mentions -- passing around timestamps and other meta-data for use by
incremental indexers. We currently write out and replicate custom property
files for this -- using commitUserData would be preferable.
It seems like another use-case the commitUserData could be useful for is doing
an empty commit that actually triggered replication, as the updated
commitUserData will cause the segments file to be updated.
For our purposes, we'd just be using CommitUpdateCommand and DUH2 as our
interfaces for writing the commitUserData, but exposing commitUserData to the
SolrJ/HTTP interfaces does seem like a nice feature. I wonder where it would be
useful to expose reading the commitUserData via SolrJ/HTTP as right now you
still need low-level code to extract the commitUserData from an IndexReader.
Perhaps stats.jsp could expose each key in the commitUserData as a stat?
> Expose IndexWriter.commit(Map<String,String> commitUserData) to solr
> ---------------------------------------------------------------------
>
> Key: SOLR-2701
> URL: https://issues.apache.org/jira/browse/SOLR-2701
> Project: Solr
> Issue Type: New Feature
> Components: update
> Affects Versions: 4.0
> Reporter: Eks Dev
> Assignee: Erick Erickson
> Priority: Minor
> Labels: commit, update
> Attachments: SOLR-2701.patch
>
> Original Estimate: 8h
> Remaining Estimate: 8h
>
> At the moment, there is no feature that enables associating user information
> to the commit point.
>
> Lucene supports this possibility and it should be exposed to solr as well,
> probably via beforeCommit Listener (analogous to prepareCommit in Lucene).
> Most likely home for this Map to live is UpdateHandler.
> Example use case would be an atomic tracking of sequence numbers or
> timestamps for incremental updates.
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