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https://issues.apache.org/jira/browse/HBASE-4901?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean-Daniel Cryans resolved HBASE-4901.
---------------------------------------

    Resolution: Invalid

If you run with DEBUG-enabled for HDFS then you will hit this:

{code}
210     if (LOG.isDebugEnabled()) {
211     LOG.debug(StringUtils.stringifyException(new IOException("config()")));
212     }
{code}

It's basically an old debug exception (in order to see the stack trace that led 
to that constructor) that was left there in the hadoop code a long time ago and 
looking at more recent code it has been removed.
                
> HBase BUG when I use HBaseConfiguration to load it
> --------------------------------------------------
>
>                 Key: HBASE-4901
>                 URL: https://issues.apache.org/jira/browse/HBASE-4901
>             Project: HBase
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 0.20.6
>         Environment: Red Hat Enterprise Linux Server release 5.4
>            Reporter: LuiYip
>              Labels: test
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> I create a class named HBaseInterfaceHolder who will hold 
> ThreadLocal<HBaseInterface> hBaseInterfaceHolder. But when the program run at 
> the line (HBaseConfiguration config = new HBaseConfiguration();), it throws a 
> java.io.IOException:config()
> at 
> org.apache.hadoop.conf.Configuration.<init>(Configuration.java:211)
> org.apache.hadoop.conf.Configuration.<init>(Configuration.java:198)
> org.apache.hadoop.hbase.HBaseConfiguration.<init>(Configuration.java:33)
> com.netentsec.niudian.phoenix.web2.hbaseinterface.HBaseInterfaceHolder$1.initialValue(HBaseInterfaceHolder.java:24)
>  this line is my own program which is the content in previous bracket.
> I search online to find out the reason. But no forum related it.

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