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From "Jonathan Hurley (JIRA)" <>
Subject [jira] [Updated] (AMBARI-18824) MOTD Can Prevent WebHCat From Shutting Down
Date Tue, 08 Nov 2016 18:06:58 GMT


Jonathan Hurley updated AMBARI-18824:
    Status: Patch Available  (was: Open)

> MOTD Can Prevent WebHCat From Shutting Down
> -------------------------------------------
>                 Key: AMBARI-18824
>                 URL:
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.4.0
>            Reporter: Jonathan Hurley
>            Assignee: Jonathan Hurley
>            Priority: Blocker
>             Fix For: 2.4.2
>         Attachments: AMBARI-18824.patch
> There was code added in AMBARI-12695 (later corrected by AMBARI-18684) which tries to
kill WebHCat if it doesn't stop with its own stop command.
> Both patches use the {{as_user}} function to wrap the call in a bash login:
> {code}
> ps -p `su hcat -l -s /bin/bash -c 'cat /var/run/webhcat/'` >/dev/null 2>&1
> {code}
> This, however, causes problems where there is a MOTD:
> {code}
> ERROR: Process ID list syntax error.
> ********* simple selection *********  ********* selection by list *********
> -A all processes                      -C by command name
> -N negate selection                   -G by real group ID (supports names)
> -a all w/ tty except session leaders  -U by real user ID (supports names)
> -d all except session leaders         -g by session OR by effective group name
> -e all processes                      -p by process ID
>                                       -q by process ID (unsorted & quick)
> T  all processes on this terminal     -s processes in the sessions given
> a  all w/ tty, including other users  -t by tty
> g  OBSOLETE -- DO NOT USE             -u by effective user ID (supports names)
> r  only running processes             U  processes for specified users
> x  processes w/o controlling ttys     t  by tty
> *********** output format **********  *********** long options ***********
> -o,o user-defined  -f full            --Group --User --pid --cols --ppid
> -j,j job control   s  signal          --group --user --sid --rows --info
> -O,O preloaded -o  v  virtual memory  --cumulative --format --deselect
> -l,l long          u  user-oriented   --sort --tty --forest --version
> -F   extra full    X  registers       --heading --no-heading --context
>                                       --quick-pid
>                     ********* misc options *********
> -V,V  show version      L  list format codes  f  ASCII art forest
> -m,m,-L,-T,H  threads   S  children in sum    -y change -l format
> -M,Z  security data     c  true command name  -c scheduling class
> -w,w  wide output       n  numeric WCHAN,UID  -H process hierarchy
> {code}
> That's not good - why is it giving us back a bad command syntax? Here's the reason:
> {code}
> [root@ijzs-c229todgsecha-r6-re1-3 ~]# su hcat -l -s /bin/bash -c 'cat /var/run/webhcat/'
> This is MOTD message :)
> 25672
> {code}
> *The MOTD is messing up the output from commands for the {{hcat}} user. Because we rely
on the error code of {{ps}}, the same non-zero code is used for a bad command and a missing
process ID*.
> Since the PID is world-readable, we don't need to run the {{only_if}} checks as a separate

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