Houston Putman created SOLR-17792:
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Summary: ParallelShardHandler has massive performance issues.
Key: SOLR-17792
URL: https://issues.apache.org/jira/browse/SOLR-17792
Project: Solr
Issue Type: Bug
Affects Versions: 9.8
Reporter: Houston Putman
SOLR-17158 changed the way that the HttpShardHandler (And
ParallelHttpShardHandler) did locking and concurrency. However, after
upgrading, and running distributed queries (at a relatively slow rate), I
noticed that there were 3 types of responses:
* QTimes between 3-6ms
* QTimes between 53-56 ms
* And requests that timed out
Looking at the logic in HttpShardHandler, there is a poll(50ms) call that is
very suspicious, and likely the reason for the jump between 3-6 ms and 53-56
ms. I would also assume that this change in concurrency logic is the reason
that many requests started timing out. Changing to the HttpShardHandlerFactory
from the ParallellHttpShardHandlerFactory fixed these issues.
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