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Posted to dev@lucene.apache.org by "Mikhail Khludnev (JIRA)" <ji...@apache.org> on 2018/05/27 08:45:00 UTC

[jira] [Created] (SOLR-12408) Introduce parallelShards() in Streaming Expressions

Mikhail Khludnev created SOLR-12408:
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             Summary: Introduce parallelShards() in Streaming Expressions
                 Key: SOLR-12408
                 URL: https://issues.apache.org/jira/browse/SOLR-12408
             Project: Solr
          Issue Type: New Feature
      Security Level: Public (Default Security Level. Issues are Public)
          Components: streaming expressions
            Reporter: Mikhail Khludnev


{{parallel()}} uses hash filter partitioning, which doesn't work in some edge cases with high cardinality facets since they kill coordinator. 
I propose to introduce {{parallelShards()}} which will accepts a collection, and spawns per-shard substreams (I'm not sure wether to use {{distrib=false}} or {{shards=foo}}). So, far it's not clear whether {{workerCollection}} is beneficial for it at all.   



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