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https://issues.apache.org/jira/browse/SOLR-6398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein closed SOLR-6398.
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Resolution: Fixed
> Add IterativeMergeStrategy to support running Parallel Iterative Algorithms
> inside of Solr
> ------------------------------------------------------------------------------------------
>
> Key: SOLR-6398
> URL: https://issues.apache.org/jira/browse/SOLR-6398
> Project: Solr
> Issue Type: Improvement
> Reporter: Joel Bernstein
> Priority: Minor
> Fix For: Trunk
>
> Attachments: SOLR-6398.patch, SOLR-6398.patch, SOLR-6398.patch,
> SOLR-6398.patch
>
>
> This ticket builds on the existing AnalyticsQuery / MergeStrategy framework
> by adding the abstract class IterativeMergeStrategy, which has built-in
> support for call-backs to the shards. The IterativeMergeStrategy is designed
> to support the execution of Parallel iterative Algorithms, such as Gradient
> Descent, inside of Solr.
> To use the IterativeMergeStrategy you extend it and implement process(). This
> gives you access to the callback() method which makes it easy to make
> repeated calls to all the shards and run algorithms that require iteration.
> Below is an example of a class that extends IterativeMergeStrategy. In this
> example it collects the *count* from the shards and then calls back to shards
> executing the *!count* AnalyticsQuery and sending it merged counts from all
> the shards.
> {code}
> class TestIterative extends IterativeMergeStrategy {
> public void process(ResponseBuilder rb, ShardRequest sreq) throws
> Exception {
> int count = 0;
> for(ShardResponse shardResponse : sreq.responses) {
> NamedList response = shardResponse.getSolrResponse().getResponse();
> NamedList analytics = (NamedList)response.get("analytics");
> Integer c = (Integer)analytics.get("mycount");
> count += c.intValue();
> }
> ModifiableSolrParams params = new ModifiableSolrParams();
> params.add("distrib", "false");
> params.add("fq","{!count base="+count+"}");
> params.add("q","*:*");
> /*
> * Call back to all the shards in the response and process the result.
> */
> QueryRequest request = new QueryRequest(params);
> List<Future<CallBack>> futures = callBack(sreq.responses, request);
> int nextCount = 0;
> for(Future<CallBack> future : futures) {
> QueryResponse response = future.get().getResponse();
> NamedList analytics =
> (NamedList)response.getResponse().get("analytics");
> Integer c = (Integer)analytics.get("mycount");
> nextCount += c.intValue();
> }
> NamedList merged = new NamedList();
> merged.add("mycount", nextCount);
> rb.rsp.add("analytics", merged);
> }
> }
> {code}
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