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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13837) Process check bug in hadoop_stop_daemon
Date Mon, 28 Nov 2016 17:15:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Weiwei Yang updated HADOOP-13837:
---------------------------------
    Description: 
Always get {{ERROR: Unable to kill ...}} after {{Trying to kill with kill -9}}, see following
output of stop-yarn.sh

{code}
<NM_HOST>: WARNING: nodemanager did not stop gracefully after 5 seconds: Trying to kill
with kill -9
<NM_HOST>: ERROR: Unable to kill 18097
{code}

hadoop_stop_daemon doesn't check process liveness correctly, this bug can be reproduced by
the script easily. kill -9 would need some time to be done, directly check process existence
right after mostly will fail.

{code}
function hadoop_stop_daemon
{
    ...
      kill -9 "${pid}" >/dev/null 2>&1
    fi
    if ps -p "${pid}" > /dev/null 2>&1; then
      hadoop_error "ERROR: Unable to kill ${pid}"
    else
      ...
}
{code}

  was:
Always get {{ERROR: Unable to kill ...}} after {{Trying to kill with kill -9}}, see following
output of stop-yarn.sh

{code}
<NM_HOST>: WARNING: nodemanager did not stop gracefully after 5 seconds: Trying to kill
with kill -9
<NM_HOST>: ERROR: Unable to kill 18097
{code}

hadoop_stop_daemon doesn't check process liveness correctly, this bug can be reproduced by
the script easily. kill -9 would need some time to be done, directly check process existence
right after mostly will fail.


> Process check bug in hadoop_stop_daemon
> ---------------------------------------
>
>                 Key: HADOOP-13837
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13837
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: scripts
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>         Attachments: check_proc.sh
>
>
> Always get {{ERROR: Unable to kill ...}} after {{Trying to kill with kill -9}}, see following
output of stop-yarn.sh
> {code}
> <NM_HOST>: WARNING: nodemanager did not stop gracefully after 5 seconds: Trying
to kill with kill -9
> <NM_HOST>: ERROR: Unable to kill 18097
> {code}
> hadoop_stop_daemon doesn't check process liveness correctly, this bug can be reproduced
by the script easily. kill -9 would need some time to be done, directly check process existence
right after mostly will fail.
> {code}
> function hadoop_stop_daemon
> {
>     ...
>       kill -9 "${pid}" >/dev/null 2>&1
>     fi
>     if ps -p "${pid}" > /dev/null 2>&1; then
>       hadoop_error "ERROR: Unable to kill ${pid}"
>     else
>       ...
> }
> {code}



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