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Date: Mon, 2 Oct 2017 20:50:02 +0000 (UTC)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.13106510.1506970176000.254168.1506977402685@Atlassian.JIRA>
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Subject: [jira] [Commented] (HADOOP-14921) Conflicts when starting daemons
 with the same name
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archived-at: Mon, 02 Oct 2017 20:50:09 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-14921?page=3Dcom.atlassi=
an.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D16=
188799#comment-16188799 ]=20

Allen Wittenauer commented on HADOOP-14921:
-------------------------------------------

A few thoughts:

a) In production systems, the user part of the string likely won't be the s=
ame, much less running on the same system.

b) If people REALLY want to run the two daemons on the same node as the sam=
e user, then HADOOP_IDENT_STRING is already available to provide a way for =
users to do their own differentiation, just like they can with running e.g.=
, two DataNode processes on the same node.

c) Or, custom entries in hadoop-user-function to do exactly what you're pro=
posing. =20

d) Having multiple, different daemons called the same thing is awful.  jps,=
 logs, pids, documentation ... it's going to be terrible for admins. ("No, =
I meant the YARN router." "No, I meant the HFDS router.")  I'd HIGHLY recom=
mend renaming it to something else.


> Conflicts when starting daemons with the same name
> --------------------------------------------------
>
>                 Key: HADOOP-14921
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14921
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: =C3=8D=C3=B1igo Goiri
>
> HDFS-10467 is adding a {{Router}} while YARN already added one for YARN-2=
915. Both of them are ultimately started from {{hadoop-functions.sh}}. For =
the PID file both of them end up using {{/tmp/hadoop-hadoop-router.pid}}. I=
 propose to use the command name also for the PID file.


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