Renato Haeberli created SOLR-18312:
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Summary: Thread-Pool Starvation in HttpJdkSolrClient for large
Queries.
Key: SOLR-18312
URL: https://issues.apache.org/jira/browse/SOLR-18312
Project: Solr
Issue Type: Bug
Reporter: Renato Haeberli
HttpJdkSolrClient uses the same thread-pool (default size of 4) for its
HttpClient and also to write the response using RequestWriter.ContentWriter.
If HttpJdkSolrClient is used with 4 or more threads and a large query, roughly
around the 1KB mark, all 4 threads from the pool become body-writers and no
thread is left for the HttpClient to read, see attached thread-dump.
I belief under 1KB, the body is written in one go and the body-writer thread is
freed up before anything is actually read. With larger bodies, the thread is
held and the first 1 KB is flushed, but HttpClient has no thread to consume it.
This happens only with Http 1.1. and not with Http 2, as far as I understand
this is due to a different mechanism Http 2 uses under the hood.
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