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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13717) Normalize daemonization behavior of the diskbalancer with balancer and mover
Date Wed, 02 Nov 2016 17:32:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15629744#comment-15629744

Anu Engineer commented on HADOOP-13717:

[~andrew.wang]  [~aw] Sorry to comment on this late.  Just saw it when I was looking at the
git log. The DiskBalancerCLI runs but for a brief moment when planning and writes a plan file
out. Then when you submit plan it reads the plan file and sends it datanode via RPC. Both
of those AFAIK does not qualify as a daemon behaviour. So why classify this as a daemon ?

I agree with the balancer comments, it does run for a long time. All long running activity
for diskbalancer is confined within the datanode, Perhaps I am missing something here ? 

> Normalize daemonization behavior of the diskbalancer with balancer and mover
> ----------------------------------------------------------------------------
>                 Key: HADOOP-13717
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13717
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>             Fix For: 3.0.0-alpha2
>         Attachments: HADOOP-13717.001.patch
> Issue found when working with the HDFS balancer.
> In {{hadoop_daemon_handler}}, it calls {{hadoop_verify_logdir}} even for the "default"
case which calls {{hadoop_start_daemon}}. {{daemon_outfile}} which specifies the log location
isn't even used here, since the command is being started in the foreground.
> I think we can push the {{hadoop_verify_logdir}} call down into {{hadoop_start_daemon_wrapper}}
instead, which does use the outfile.

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