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Date: Tue, 29 Nov 2016 01:56:58 +0000 (UTC)
From: "Weiwei Yang (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.13023795.1480353079000.384558.1480384618437@Atlassian.JIRA>
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References: <JIRA.13023795.1480353079000@Atlassian.JIRA> <JIRA.13023795.1480353079909@arcas>
Subject: [jira] [Updated] (HADOOP-13837) Process check bug in
 hadoop_stop_daemon of hadoop-functions.sh
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archived-at: Tue, 29 Nov 2016 01:57:00 -0000


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

Weiwei Yang updated HADOOP-13837:
---------------------------------
    Attachment:     (was: HADOOP-13837.01.patch)

> Process check bug in hadoop_stop_daemon of hadoop-functions.sh
> --------------------------------------------------------------
>
>                 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: HADOOP-13837.01.patch, 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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