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From "Appy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16044) Fix 'hbase shell' output parsing in bash scripts
Date Thu, 16 Jun 2016 17:38:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15334251#comment-15334251
] 

Appy commented on HBASE-16044:
------------------------------

I did a bunch of refactoring recently. But looking around, I don't see why the output will
change. But here's my thought:
OMG, what are we doing in these scripts!
{{| tail -3 | head -1}}
Exactly the 3rd line from the bottom of an *interactive shell* output, which should basically
be free-form and no-one should depend on it. Really? Hack level = max. Such a thing is bound
to break.


> Fix 'hbase shell' output parsing in bash scripts
> ------------------------------------------------
>
>                 Key: HBASE-16044
>                 URL: https://issues.apache.org/jira/browse/HBASE-16044
>             Project: HBase
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 2.0.0
>            Reporter: Samir Ahmic
>            Assignee: Samir Ahmic
>            Priority: Critical
>             Fix For: 2.0.0
>
>
> In some of our bash scripts we are piping command in hbase shell and then parsing response
to define variables.  Since 'hbase shell' output format is changed we are picking wrong values
from output Here is example form gracful_stop.sh:
> {code}
> HBASE_BALANCER_STATE=$(echo 'balance_switch false' | "$bin"/hbase --config "${HBASE_CONF_DIR}"
shell | tail -3 | head -1)
> {code}
> this will return "balance_switch true" instead of previous balancer  state.



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