https://community.cloudera.com/t5/Archives-of-Support-Questions/how-to-resolve-Hadoop-Hue-Error-and-what-is-nofile-and-nproc/m-p/160961#M36665 <P><A rel="user" href="https://community.cloudera.com/users/3134/sanchinakishore.html" nodeid="3134">@kishore sanchina</A> </P><P>nofile is the number of open files a linux user can open in a session. Check this <A href="http://www.cyberciti.biz/faq/linux-increase-the-maximum-number-of-open-files/">link</A> for more details. There is a soft and hard limit for this.</P><P>nproc is the number of processes a linux user may open in a session. This <A href="http://linux.die.net/man/5/limits.conf">link</A> may also help you understand how this works.</P> Tue, 02 Aug 2016 23:20:14 GMT mqureshi 2016-08-02T23:20:14Z https://community.cloudera.com/t5/Archives-of-Support-Questions/how-to-resolve-Hadoop-Hue-Error-and-what-is-nofile-and-nproc/m-p/160960#M36664 <P>After opening a case with HortonWorks, we believe for the root cause of this issue to have something to do with the ulimit factor being exceeded, or number of open files. From /var/log/hue/runcpserver.log:</P><P>error: [Errno 24] Too many open files</P><P>The support engineer advised to edit /etc/security/limits.conf, and add the following lines:</P><P>hue - nofile 32768</P><P>hue - nproc 65536</P><P>please explain what is nofile and nproc options</P> Tue, 21 Apr 2026 13:50:16 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/how-to-resolve-Hadoop-Hue-Error-and-what-is-nofile-and-nproc/m-p/160960#M36664 Former Member 2026-04-21T13:50:16Z https://community.cloudera.com/t5/Archives-of-Support-Questions/how-to-resolve-Hadoop-Hue-Error-and-what-is-nofile-and-nproc/m-p/160961#M36665 <P><A rel="user" href="https://community.cloudera.com/users/3134/sanchinakishore.html" nodeid="3134">@kishore sanchina</A> </P><P>nofile is the number of open files a linux user can open in a session. Check this <A href="http://www.cyberciti.biz/faq/linux-increase-the-maximum-number-of-open-files/">link</A> for more details. There is a soft and hard limit for this.</P><P>nproc is the number of processes a linux user may open in a session. This <A href="http://linux.die.net/man/5/limits.conf">link</A> may also help you understand how this works.</P> Tue, 02 Aug 2016 23:20:14 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/how-to-resolve-Hadoop-Hue-Error-and-what-is-nofile-and-nproc/m-p/160961#M36665 mqureshi 2016-08-02T23:20:14Z https://community.cloudera.com/t5/Archives-of-Support-Questions/how-to-resolve-Hadoop-Hue-Error-and-what-is-nofile-and-nproc/m-p/160962#M36666 <P><A rel="user" href="https://community.cloudera.com/users/10969/mqureshi.html" nodeid="10969">@mqureshi</A> thanks </P> Tue, 02 Aug 2016 23:31:15 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/how-to-resolve-Hadoop-Hue-Error-and-what-is-nofile-and-nproc/m-p/160962#M36666 Former Member 2016-08-02T23:31:15Z