Todd Lipcon created KUDU-1790:
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Summary: "Master lookup permit" design wastes lots of reactor
thread CPU
Key: KUDU-1790
URL: https://issues.apache.org/jira/browse/KUDU-1790
Project: Kudu
Issue Type: Bug
Components: client
Affects Versions: 1.1.0
Reporter: Todd Lipcon
Looking at some stress tests, I see that the reactor thread is spending a
significant percent of its CPU time in LookupRpc::SendRpcCb, and doing
thousands of futex calls per second. It seems like the current approach of
linear backoff of TryWait calls is not a good design, and we should probably do
something less busy-wait-like to avoid this problem.
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