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https://issues.apache.org/jira/browse/HDFS-7204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14164476#comment-14164476
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Allen Wittenauer commented on HDFS-7204:
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TL;DR: no.
Longer:
In branch-2 and earlier, there are the sbin/start-balancer.sh and
sbin/stop-balancer.sh. These commands basically turn balancer into a
background process that, like when you run it in interactive mode, runs until
completion. The difference is that the output is sent to a log file. These
commands do this by running the balancer underneath hadoop-daemon.sh.
Post-HADOOP-9902, however, hadoop-daemon.sh has been neutered, moving all of
its functionality into hadoop-functions.sh with bin/hdfs, bin/mapred, bin/yarn,
etc. These scripts have some glue that triggers the necessarily bits to run
stuff into this background mode. When 9902 was committed, running the balancer
in the previous way was broken (completely my fault!). This restores that
functionality. Also, since it is running in this background/daemon mode, it
also gets a working pid file and the ability to do hdfs --daemon status to see
if the balancer is still running.
To get the functionality that you are talking about would require much more
extensive changes. Most people with large enough setups that want to run
balancer "permanently" tend to just run it from cron or whatever.
> balancer doesn't run as a daemon
> --------------------------------
>
> Key: HDFS-7204
> URL: https://issues.apache.org/jira/browse/HDFS-7204
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: scripts
> Reporter: Allen Wittenauer
> Assignee: Allen Wittenauer
> Labels: newbie
> Attachments: HDFS-7204-01.patch, HDFS-7204.patch
>
>
> From HDFS-7184, minor issues with balancer:
> * daemon isn't set to true in hdfs to enable daemonization
> * start-balancer script has usage instead of hadoop_usage
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