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From "Ferdy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7614) Reloading configuration when using imputstream resources results in org.xml.sax.SAXParseException
Date Sun, 25 Sep 2011 10:01:26 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114199#comment-13114199

Ferdy commented on HADOOP-7614:

You are right; with currently proposed patch every Configuration will never close marking-supported
inputstream. (How bad is this? When a Configuration is gc-ed, could we make sure all streams
are closed, i.e. in a finalizer? I'm not sure if this is the way to go).

So what about another solution? Read and close the stream and somehow keep/cache the contents
when the Configuration is reloaded?

> Reloading configuration when using imputstream resources results in org.xml.sax.SAXParseException
> -------------------------------------------------------------------------------------------------
>                 Key: HADOOP-7614
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7614
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: conf
>    Affects Versions: 0.21.0
>            Reporter: Ferdy
>            Priority: Minor
>         Attachments: HADOOP-7614-v1.patch, HADOOP-7614-v2.patch
> When using an inputstream as a resource for configuration, reloading this configuration
will throw the following exception:
> Exception in thread "main" java.lang.RuntimeException: org.xml.sax.SAXParseException:
Premature end of file.
> 	at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1576)
> 	at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:1445)
> 	at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:1381)
> 	at org.apache.hadoop.conf.Configuration.get(Configuration.java:569)
> ...
> Caused by: org.xml.sax.SAXParseException: Premature end of file.
> 	at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:249)
> 	at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284)
> 	at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:124)
> 	at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1504)
> 	... 4 more
> To reproduce see following testcode:
>     Configuration conf = new Configuration();
>     ByteArrayInputStream bais = new ByteArrayInputStream("<configuration></configuration>".getBytes());
>     conf.addResource(bais);
>     System.out.println(conf.get("blah"));
>     conf.addResource("core-site.xml"); //just add a named resource, doesn't matter which
>     System.out.println(conf.get("blah"));
> Allowing inputstream resources is flexible, but in cases such as this in can lead to
difficult to debug problems.
> What do you think is the best solution? We could:
> A) reset the inputstream after it is read instead of closing it (but what to do when
the stream does not support marking?)
> B) leave it up to the client (for example make sure you implement close() so that it
resets the steam)
> C) when reading the inputstream for the first time, cache or wrap the contents somehow
so that is can be read multiple times (let's at least document it)
> D) remove inputstream method altogether
> e) something else?
> For now I have attached a patch for solution A.

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