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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