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Posted to notifications@accumulo.apache.org by "DomGarguilo (via GitHub)" <gi...@apache.org> on 2026/09/22 18:28:05 UTC

Re: [I] Use LinkedTransferQueue poll w/ timeout after upgrade to JDK 21+ [accumulo]

DomGarguilo commented on issue #5827:
URL: https://github.com/apache/accumulo/issues/5827#issuecomment-5781793790

   On a 5 node test cluster I hit the cost of this issue testing 4.0.0-alpha. The cluster was idle with no fate transactions and the fate workers were still burning 24% of a core on one manager and 72% on another. ~26 workers all waking up 1000 times a second on an empty queue. Measured from thread dumps 60s apart.
   
   #5825 replaced the `poll(100, MILLISECONDS)` with `poll()` + `Thread.sleep(1)` so 100x the wakeups. Sleeping for 50 or 100ms would get most of that back now without waiting for JDK 21. Working on a PR for that now.


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