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https://issues.apache.org/jira/browse/SOLR-5944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14946806#comment-14946806
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Ishan Chattopadhyaya commented on SOLR-5944:
--------------------------------------------
Here's the approach I'm talking about, in details (also for the benefit of
someone who hasn't followed the previous approaches/discussions closely):
1. Make \_version\_ as a docValues field, indexed=false, stored=false
[SOLR-6337].
2. When an inplace update command (which syntactically looks like an atomic
update) is received on the leader, the leader (a) applies the update on its
index, (b) obtains the {{prevVersion}} as the \_version\_ of the document on
which the update was applied to, (c) writes the inplace update (only the
partial document) in its tlog along with a {{prevPointer}}, corresponding to
the tlog entry of the document with {{prevVersion}} or -1 if such an entry
doesn't exist, of the update, (d) forward the update to the other replicas,
along with the prevVersion.
3. At a replica, upon receiving an inplace update, the last version (lets call
it {{lastVersion}}) for the document id is obtained from the tlog/index. Now,
(a) If this matches the {{prevVersion}}, then apply the update, write to tlog
and return success to the leader. (b) If this doesn't match the {{prevVersion}}
(case of an out of order update), wait (till a timeout) for the update with
{{prevVersion}} to be written to tlog/index, possibly in other threads, and
then apply the current update and return success to the leader. If a timeout
has reached, but the dependent update hasn't arrived, a failure is sent back to
the leader (which can then mark the replica in recovery).
4. RealTimeGet for documents that have inplace updates can be resolved by
successively following a {{prevPointer}} in the tlog backwards, either to a
full update in tlog or to the index.
> Support updates of numeric DocValues
> ------------------------------------
>
> Key: SOLR-5944
> URL: https://issues.apache.org/jira/browse/SOLR-5944
> Project: Solr
> Issue Type: New Feature
> Reporter: Ishan Chattopadhyaya
> Assignee: Shalin Shekhar Mangar
> Attachments: SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch,
> SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch,
> SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch,
> SOLR-5944.patch
>
>
> LUCENE-5189 introduced support for updates to numeric docvalues. It would be
> really nice to have Solr support this.
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