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Centos 7, elasticsearch 5.x.
I am tracing an issue where elasticsearch becomes non responsive to logstash. (both running locally)
I measure the open handles, as we have had problems on the logstash side with this.
Today, when I run the below:
ls -al /proc/`pgrep -f elasticsearch`/fd
I see something I have never seen before: Some output lines in red (see below).
What does the red mean?
It's a broken symlink. But since those FDs are open on virtual objects it's impossible to resolve them within the context of the filesystem regardless.
From this link
Red: Archive file
Red with black background: Broken link
In your case, those are broken links.