Todd Lipcon created KUDU-2187:
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Summary: Don't hold threadpool lock when creating additional
workers
Key: KUDU-2187
URL: https://issues.apache.org/jira/browse/KUDU-2187
Project: Kudu
Issue Type: Improvement
Components: perf, util
Affects Versions: 1.6.0
Reporter: Todd Lipcon
I've noticed in a lot of clusters that creating new threads often takes a
relatively long time, for whatever reason. Currently we create new threads
while holding the threadpool's lock, which means that, even if other existing
worker threads finish their current work items and are ready to handle newly
enqueued work, everything is frozen while the thread is being created. This
creates potentially long stalls resulting in increased queue time at the high
percentiles.
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