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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7614) Reloading configuration when using imputstream resources results in org.xml.sax.SAXParseException
Date Wed, 07 Sep 2011 15:12:10 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099007#comment-13099007

Hadoop QA commented on HADOOP-7614:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed unit tests in hadoop-common-project.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/145//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/145//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-auth.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/145//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/145//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-annotations.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/145//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-auth-examples.html
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/145//console

This message is automatically generated.

> 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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