The selector threads are the threads in jetty 8 that run the NIO Selector. They are responsible for initiating all IO in the server, specifically they initiate all reads and they handle the unblocking of any blocked writes.
If the server is busy, then the selector threads are often busy. A 100% CPU spike might suggest a bug, but a 65% spike could just be busy IO or even a DOS attack. Note that jetty-8 is end of life an no longer supported. That release is 3 years old. So updating to a 9.3.x release might be best. regards -- Greg Wilkins <[email protected]> CTO http://webtide.com
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