[jira] [Created] (SOLR-9938) Improve the performance of CloudSolrStream

["Joel Bernstein (JIRA)" <ji...@apache.org>]

Joel Bernstein created SOLR-9938:
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             Summary: Improve the performance of CloudSolrStream
                 Key: SOLR-9938
                 URL: https://issues.apache.org/jira/browse/SOLR-9938
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Joel Bernstein


Now that we have started to improve the efficiency of Streaming, I think it makes sense to work on CloudSolrStream, which is used as a bulk stream source.

The first thing to tackle is how the merge sort of the SolrStream from each shard is done.

Currently the sorting is done by a TreeSet, which is not the most efficient approach. For one thing each *put* and *poll* on the TreeSet creates a new map Entry. When streaming millions of documents this adds up. Also the TreeSet is backed by a TreeMap that maintains a fully order set of tuples. We just need to know the highest Tuple.

I think we can increase throughput significantly by using a custom priority queue for sorting rather then the TreeSet.  






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