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https://issues.apache.org/jira/browse/SOLR-4816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13771219#comment-13771219
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Shawn Heisey commented on SOLR-4816:
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I've been looking at recent updates to the ref guide via the commits alias.
One of the more recent pages to receive updates is the one about atomic updates
and optimistic concurrency. It occurred to me that ConcurrentUpdateSolrServer
can't be used at all with optimistic concurrency because it won't ever fail,
even if the update fails because of a version conflict.
On topic for this issue: Could optimistic concurrency be used effectively if
CloudSolrServer is in parallel thread mode? I've been assured that it won't
swallow exceptions, but would the exception be associated with the correct
request? Exactly how parallel threads works in this update is a mystery to me.
I'm only asking so the documentation can be correct, not to achieve different
behavior.
> Add document routing to CloudSolrServer
> ---------------------------------------
>
> Key: SOLR-4816
> URL: https://issues.apache.org/jira/browse/SOLR-4816
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 4.3
> Reporter: Joel Bernstein
> Assignee: Mark Miller
> Priority: Minor
> Fix For: 4.5, 5.0
>
> Attachments: RequestTask-removal.patch, SOLR-4816.patch,
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch,
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch,
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch,
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch,
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch,
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch,
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816-sriesenberg.patch
>
>
> This issue adds the following enhancements to CloudSolrServer's update logic:
> 1) Document routing: Updates are routed directly to the correct shard leader
> eliminating document routing at the server.
> 2) Optional parallel update execution: Updates for each shard are executed in
> a separate thread so parallel indexing can occur across the cluster.
> These enhancements should allow for near linear scalability on indexing
> throughput.
> Usage:
> CloudSolrServer cloudClient = new CloudSolrServer(zkAddress);
> cloudClient.setParallelUpdates(true);
> SolrInputDocument doc1 = new SolrInputDocument();
> doc1.addField(id, "0");
> doc1.addField("a_t", "hello1");
> SolrInputDocument doc2 = new SolrInputDocument();
> doc2.addField(id, "2");
> doc2.addField("a_t", "hello2");
> UpdateRequest request = new UpdateRequest();
> request.add(doc1);
> request.add(doc2);
> request.setAction(AbstractUpdateRequest.ACTION.OPTIMIZE, false, false);
> NamedList response = cloudClient.request(request); // Returns a backwards
> compatible condensed response.
> //To get more detailed response down cast to RouteResponse:
> CloudSolrServer.RouteResponse rr = (CloudSolrServer.RouteResponse)response;
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