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https://issues.apache.org/jira/browse/SOLR-1949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884849#action_12884849
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Hoss Man commented on SOLR-1949:
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1) In the future, please don't use jira to ask questions about odd behavior you
are seeing -- that is what the solr-user mailing list is for. as a general
rule you should only open a "Bug" in Jira issue if you have already asked a
question on the solr-user mailing list and have verified that there isn't a
mistake/missunderstanding in your config.
2) your initial report is inconsistent and makes no sense...
bq. We have field ID as string and uniqueKey, so the update operation overwite
documents with the same ID.
...
bq. Remember that documents don't have unique identifiers
...if you do follow up on solr-user, please be more explicit, and clarify
exactly what you are doing (showing us your schema.xml, and some sample
documents is pretty much a neccdessity to make sense of problems like this that
don't produce an error message)
> overwrite document fails if Solr index is not optimized
> -------------------------------------------------------
>
> Key: SOLR-1949
> URL: https://issues.apache.org/jira/browse/SOLR-1949
> Project: Solr
> Issue Type: Bug
> Components: update
> Affects Versions: 1.4
> Environment: linux centos
> Reporter: Miguel B.
>
> Scenario:
> - Solr 1.4 with multicore
> - We have a set of 5.000 source documents that we want to index.
> - We send these set to Solr by SolrJ API and they are added correctly. We
> have field ID as string and uniqueKey, so the update operation overwite
> documents with the same ID. The result is 4500 unique documents in Solr. Also
> all documents have an index field that contains the source repository of each
> document, we need it because we want to index another sources.
> - After add operation, we send optimization.
>
> All works fine at this point. Solr have 4.500 documents at Solr core (and
> 4.500 max documents too).
>
> Now these 5.000 sources documents are updated by users, and a set of them are
> deleted (supose, 1000). So, now we want to update our Solr index with these
> change (unfortunately our repository doesn't support an incremental
> approach), the operations are:
>
> - At index Solr, delete documents by query (by the field that contains
> document source repository). We use deleteByQuery and commit SolrJ operations.
> - At this point Solr core have 0 documents (but 4.500 max documents,
> important!!!)
> - Now we add to Solr the new version of source documents (4000). Remember
> that documents don't have unique identifiers, supose that unique items are
> 3000. So when add operation finish (after commit sended) Solr index must have
> 3.000 unique items.
>
> But the result isn't 3.000 unique items, we obtains a random results: 3000,
> 2980, 2976, etc. It's a serious problem because we lost documents.
> We have a workaround. At these operations just after delete operation, we
> send an optimization to Solr (maxDocuments are updated). After this, we send
> new documents. By this way the result is always fine.
> In our tests, we can see that this issue is only when the new documents
> overwrites documents that existed in solr.
> Thanks!!
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