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Posted to common-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2011/09/07 15:34:09 UTC
[jira] [Commented] (HADOOP-7614) Reloading configuration when using
imputstream resources results in org.xml.sax.SAXParseException
[ https://issues.apache.org/jira/browse/HADOOP-7614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13098937#comment-13098937 ]
Hadoop QA commented on HADOOP-7614:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12493317/HADOOP-7614-v1.patch
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 patch. The patch command could not apply the patch.
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/144//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
>
>
> 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 one
> 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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