[ 
https://issues.apache.org/jira/browse/AMBARI-21038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Masahiro Tanaka updated AMBARI-21038:
-------------------------------------
    Description: 
When I tried to rebalance HDFS with Ambari, I pushed "Rebalance HDFS" in the 
pulldown menu on each Hosts page.

I expected it worked same as I pushed "Rebalance HDFS" on Service Page, though 
it doesn't work.

The error log on Ambari Web is as below:
{code}
Traceback (most recent call last):
  File 
"/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py",
 line 420, in <module>
    NameNode().execute()
  File 
"/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py",
 line 280, in execute
    method(env)
  File 
"/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py",
 line 282, in rebalancehdfs
    name_node_parameters = json.loads( params.name_node_params )
  File "/usr/lib/python2.6/site-packages/ambari_simplejson/__init__.py", line 
307, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.6/site-packages/ambari_simplejson/decoder.py", line 
335, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
TypeError: expected string or buffer
{code}

  was:
When I tried to rebalance HDFS with Ambari, I pushed "Rebalance HDFS" in the 
pulldown menu on each Hosts page.

I expected it worked same as I pushed "Rebalance HDFS" on Service Page, though 
it doesn't work.

The error log is as below:
{code}
Traceback (most recent call last):
  File 
"/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py",
 line 420, in <module>
    NameNode().execute()
  File 
"/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py",
 line 280, in execute
    method(env)
  File 
"/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py",
 line 282, in rebalancehdfs
    name_node_parameters = json.loads( params.name_node_params )
  File "/usr/lib/python2.6/site-packages/ambari_simplejson/__init__.py", line 
307, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.6/site-packages/ambari_simplejson/decoder.py", line 
335, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
TypeError: expected string or buffer
{code}


> Rebalance HDFS button on Hosts page doesn't work
> ------------------------------------------------
>
>                 Key: AMBARI-21038
>                 URL: https://issues.apache.org/jira/browse/AMBARI-21038
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server, ambari-web
>    Affects Versions: 2.5.0, 2.4.2
>         Environment: Ambari 2.4 on CentOS6.8
> Ambari 2.5 on CentOS7.2
>            Reporter: Masahiro Tanaka
>
> When I tried to rebalance HDFS with Ambari, I pushed "Rebalance HDFS" in the 
> pulldown menu on each Hosts page.
> I expected it worked same as I pushed "Rebalance HDFS" on Service Page, 
> though it doesn't work.
> The error log on Ambari Web is as below:
> {code}
> Traceback (most recent call last):
>   File 
> "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py",
>  line 420, in <module>
>     NameNode().execute()
>   File 
> "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py",
>  line 280, in execute
>     method(env)
>   File 
> "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py",
>  line 282, in rebalancehdfs
>     name_node_parameters = json.loads( params.name_node_params )
>   File "/usr/lib/python2.6/site-packages/ambari_simplejson/__init__.py", line 
> 307, in loads
>     return _default_decoder.decode(s)
>   File "/usr/lib/python2.6/site-packages/ambari_simplejson/decoder.py", line 
> 335, in decode
>     obj, end = self.raw_decode(s, idx=_w(s, 0).end())
> TypeError: expected string or buffer
> {code}



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