Hello,

Everything was stopped as an error occurred on the operating master server as follows.

2021-12-10 12:05:27,463 [qtp586965379-52] ERROR org.apache.wicket.pageStore.DiskDataStore - /home/suprem/quickbuild-80-9.0.27/temp/sessions/quickbuild-filestore/node0flxlem07muep71j923nmk5s42396/data (Too many open files)
java.io.FileNotFoundException: /home/suprem/quickbuild-80-9.0.27/temp/sessions/quickbuild-filestore/node0flxlem07muep71j923nmk5s42396/data (Too many open files)
at java.io.RandomAccessFile.open0(Native Method)
at java.io.RandomAccessFile.open(RandomAccessFile.java:316)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:243)
at org.apache.wicket.pageStore.DiskDataStore$SessionEntry.getFileChannel(DiskDataStore.java:401)
at org.apache.wicket.pageStore.DiskDataStore$SessionEntry.savePage(DiskDataStore.java:328)
at org.apache.wicket.pageStore.DiskDataStore.storeData(DiskDataStore.java:176)
at org.apache.wicket.pageStore.AsynchronousDataStore.storeData(AsynchronousDataStore.java:232)
at org.apache.wicket.pageStore.DefaultPageStore.storePageData(DefaultPageStore.java:115)

I checked master server (qb java pid: 147465):

root@master:/home/suprem# while true; do cat /proc/sys/fs/file-nr; sleep 5; done
12656   0   26340735
12656   0   26340735


root@master:/home/suprem# lsof | awk '{ print $2; }' | uniq -c | sort -rn | head
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1001/gvfs
      Output information may be incomplete.
2491378 147465
117832 81283
 111996 81862
 105696 82451
 105552 83100
 104390 83310
 104390 82369
 104390 81650
 102808 82296
 102808 82043

root@master: cat /etc/security/limits.conf
* hard nofile 500000
* soft nofile 500000

# End of file


root@master:cat /proc/147465/limits
Max open files            4096                 4096                 files

Can I know why the QB process is set to 4096?
And can you suspect that this is causing a problem?