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From "Per Steffensen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-5360) Correctly routed realtime-get through CloudSolrServer
Date Thu, 17 Oct 2013 13:48:41 GMT
Per Steffensen created SOLR-5360:
------------------------------------

             Summary: Correctly routed realtime-get through CloudSolrServer
                 Key: SOLR-5360
                 URL: https://issues.apache.org/jira/browse/SOLR-5360
             Project: Solr
          Issue Type: New Feature
          Components: SolrCloud
    Affects Versions: 4.5
            Reporter: Per Steffensen
            Assignee: Per Steffensen
             Fix For: 4.5.1


Today you cannot do realtime-gets through CloudSolrServer, because it will not route the request
to the correct replica (the leader-replica of the shard where the document to be fetched lives
according to routing rules)

Doing realtime-gets from clients are important in several scenarios. For example in common
optimistic locking scenario. Pseudo-code:
{code}
public void createOrUpdateDoc(String id, ChangeInfo changes) {
    outherLoop: while(true) {
        try {
            // Assume that document with id does not exist already
            // Just try to store it as a new document
            SolrInputDocument newDoc = createNewSolrInputDocument(id, changes); 
            sendUpdateRequestToSolr(newDoc);
            return;
        } catch (DocumentAlreadyExists e) {
            // Ok the document already existed
            while(true) {
                // Fetch the existing document - realtime-get so that you do not
                // have to wait until next commit to be able to fetch it, if the document
                // was created/updated after last commit
                SolrDocument fetchedDoc = realTimeGet(id);
                // Merge the changes into the existing document
                // Including copy of _version_ from fetchedDoc to updatedDoc
                SolrInputDocument updatedDoc = merge(fetchedDoc, changes);
                // Try to store the updated document
                try {
                    sendUpdateRequestToSolr(updatedDoc);
                    return;
                } catch (VersionConflict e) {
                    // Someone updated the doc, between my fetch and update
                    // Ignore, just take another round in the inner while(true)-loop
                } catch (DocumentDoesNotExist e) {
                    // Someone deleted the document since when I tried to
                    // create it as a new document the first time
                    // Will create it again by taking another round in outher
                    // while(true)-loop
                    continue outherLoop;
                }
            }
        }
    }
}
{code}
Sorry if the code is not perfect, but I just wrote it directly here - I sure you get the idea.

I would like to enable realtime-get through CloudSolrServer in order to be able to do scenarios
as e.g. the one shown above



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