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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9253) Capture ulimit info in the logs at service start time
Date Tue, 29 Jan 2013 01:42:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13564968#comment-13564968

Andy Isaacson commented on HADOOP-9253:

bq. I am not quite sure i understand what you are referring to. The log file that is being
printed to the console should never have any left over contents as start commands overwrites

Your patch has:
+++ hadoop-common-project/hadoop-common/src/main/bin/hadoop-daemon.sh
@@ -154,7 +154,11 @@ case $startStop in
     echo $! > $pid
-    sleep 1; head "$log"
+    sleep 1
+    # capture the ulimit output
+    echo "ulimit -a" >> $log
+    ulimit -a >> $log 2>&1
+    head "$log"

The file {{$log}} might be empty, or it might have some content from the 'nohup' command line
a few lines up.  Regardless, your patch then adds two commands (echo, then ulimit) that {{>>}}
append to {{$log}}. Together those will append 17 lines of output to {{$log}}.

Then you use {{head}} to print out the first 10 lines of {{$log}}.  These 10 lines might include
some errors or warning messages from nohup, and then a few lines of the 17 that were printed
by ulimit.

So I have two feedback items: 1. it's unclear why to write {{ulimit}} to {{$log}} at all.
Why not just write ulimit output directly to console? 2. If writing ulimit to $log, why use
{{head}} to truncate the output?  At least change the {{head}} command to print the entire
expected output, {{head -20}} or similar.
> Capture ulimit info in the logs at service start time
> -----------------------------------------------------
>                 Key: HADOOP-9253
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9253
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 1.1.1, 2.0.2-alpha
>            Reporter: Arpit Gupta
>            Assignee: Arpit Gupta
>         Attachments: HADOOP-9253.branch-1.patch, HADOOP-9253.branch-1.patch, HADOOP-9253.patch
> output of ulimit -a is helpful while debugging issues on the system.

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