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https://issues.apache.org/jira/browse/HBASE-8197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615910#comment-13615910
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Jonathan Hsieh edited comment on HBASE-8197 at 3/28/13 12:09 AM:
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Looks like what you need is available hm.. the diff between older hadoop and
hadoop2 is this:
in Hadoop's Configuration.java file.
https://github.com/apache/hadoop-common/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java#L2113
{code}
if (updatingResource != null) {
String[] sources = updatingResource.get(name);
if(sources != null) {
for(String s : sources) {
Element sourceNode = doc.createElement("source");
sourceNode.appendChild(doc.createTextNode(s));
propNode.appendChild(sourceNode);
}
}
}
{code}
And your can get the chain via: Configuraiton.getPropertySources.
https://github.com/apache/hadoop-common/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java#L1172
[~giacomotaylor] how about we change this into a documentation jira (which
would be something along the line of if you use hadoop2's hadoop-common's
configuratoin you get this).?
was (Author: jmhsieh):
Looks like what you need is available hm.. the diff between older hadoop
and hadoop2 is this:
in Hadoop's Configuration.java file.
https://github.com/apache/hadoop-common/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java#L2113
{code}
if (updatingResource != null) {
String[] sources = updatingResource.get(name);
if(sources != null) {
for(String s : sources) {
Element sourceNode = doc.createElement("source");
sourceNode.appendChild(doc.createTextNode(s));
propNode.appendChild(sourceNode);
}
}
}
{code}
And your can get the chain via: Configuraiton.getPropertySources.
https://github.com/apache/hadoop-common/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java#L1172
[[email protected]] how about we change this into a documentation jira
(which would be something along the line of if you use hadoop2's
hadoop-common's configuratoin you get this).?
> Cannot distinguish between HBase default config value and client overridden
> config value
> ----------------------------------------------------------------------------------------
>
> Key: HBASE-8197
> URL: https://issues.apache.org/jira/browse/HBASE-8197
> Project: HBase
> Issue Type: Bug
> Components: Usability
> Affects Versions: 0.94.6
> Reporter: James Taylor
> Priority: Minor
>
> By HBase setting default values in hbase-default.xml, it makes it difficult
> for a platform to know if a value has been overridden by the client. For
> example, Phoenix has a default value it would like to use for
> hbase.client.scanner.caching. I'd like to be able to call config.setIfUnset
> option to use our default value if a client hasn't already provided their
> own. Since HBase sets this in hbase-default.xml to 1, I can't differentiate
> between the client have a value in their hbase-sites.xml as 1 versus the
> default value we're getting from HBase.
> Wouldn't it be better if HBase had constants defined in a Java interface that
> would be used by HBase as the default value if none other is provided, like
> this:
> config.getInt("hbase.client.scanner.caching",
> HBaseDefault.CLIENT_SCANNER_CACHING);
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