Seeing too many lsof can't identify protocol

java linux file lsof
Johnny picture Johnny · Oct 27, 2011 · Viewed 36.7k times · Source


I have a Java process/app. When I run /usr/sbin/lsof -p on that java process, I see a lot of "can't identify protocol". Also, interestingly, File descriptors(FDs) are increasing at a very steady rate. And those FDs that are being created are having description as "can't identify protocol".

So, is there any way to instrument/profile the java process so as to nail down who is creating that many FDs. Any detailed explanation on any tool would be really really helpful.

A quick google search tells me strace is one way but IIUC, that will show linux system calls coming out of the java process. I am more interested in which part of my java code is behaving badly than what system calls are being generated.

Again, any ideas/suggestions would be simply great!

Answer

Marek picture Marek · Dec 9, 2012

Lsof prints can't identify protocol for half-open TCP/IP connections: https://idea.popcount.org/2012-12-09-lsof-cant-identify-protocol/

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