[collectd 0005339]: too many open files

[Mantis Bug Tracker]

The following issue has been ASSIGNED. 
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https://www.opencsw.org/mantis/view.php?id=5339 
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Reported By:                rselas
Assigned To:                dam
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Project:                    collectd
Issue ID:                   5339
Category:                   
Reproducibility:            always
Severity:                   block
Priority:                   normal
Status:                     assigned
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Date Submitted:             2021-03-09 17:16 CET
Last Modified:              2021-03-09 17:44 CET
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Summary:                    too many open files
Description: 
collectd reports "too many open files" error despite the fact that there
are a lot fd free still not being used:

# plimit 4205
4205:   collectd -C /etc/opt/csw/collectd.conf -f
   resource              current         maximum
  time(seconds)         unlimited       unlimited
  file(blocks)          unlimited       unlimited
  data(kbytes)          unlimited       unlimited
  stack(kbytes)         8192            unlimited
  coredump(blocks)      unlimited       unlimited
  nofiles(descriptors)  16384           32768
  vmemory(kbytes)       unlimited       unlimited

# pfiles 4205 | tail -10
        SOCK_STREAM
        SO_SNDBUF(16384),SO_RCVBUF(5120)
        sockname: AF_UNIX 
        peer: collectd[4205] zone: global[0]
 573: S_IFSOCK mode:0666 dev:599,0 ino:62746 uid:0 gid:0 size:0
      O_RDWR|O_NONBLOCK
        SOCK_STREAM
        SO_SNDBUF(16384),SO_RCVBUF(5120)
        sockname: AF_UNIX 
        peer: collectd[4205] zone: global[0]

example of error log entry:

[2021-03-09 14:46:38] csv plugin: fopen
(/diag/collectd/csv/hcdsns-be-jee-r02a-id-c04-m1-n2/DataSource-opss-audit-viewDS/gauge-value-ResolvedAsCommittedTotalCount-2021-03-09)
failed: Too many open files


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