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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3271) Using webhdfs in a flink topology throws classnotfound exception
Date Tue, 09 Feb 2016 15:41:18 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15139082#comment-15139082
] 

ASF GitHub Bot commented on FLINK-3271:
---------------------------------------

Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1543#discussion_r52324384
  
    --- Diff: flink-shaded-hadoop/pom.xml ---
    @@ -111,6 +111,7 @@ under the License.
     									<include>io.netty:netty:*</include>
     									<include>org.apache.curator:*</include>
     									<include>org.apache.hadoop:*</include>
    +									<include>org.mortbay.jetty:*</include>
    --- End diff --
    
    I think it is not necessary to include the dependency in the fat jar. We only include
those where the classes should be relocated to "hide" the dependency. We probably do not want
to "hide" jetty.


> Using webhdfs in a flink topology throws classnotfound exception
> ----------------------------------------------------------------
>
>                 Key: FLINK-3271
>                 URL: https://issues.apache.org/jira/browse/FLINK-3271
>             Project: Flink
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.10.1
>            Reporter: Abhishek Agarwal
>            Assignee: Abhishek Agarwal
>
> I was just trying to run a storm topology on flink using flink-storm. I got this exception
- 
> {noformat}
> Caused by: java.lang.NoClassDefFoundError: org/mortbay/util/ajax/JSON
> 	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.jsonParse(WebHdfsFileSystem.java:325)
> 	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$FsPathResponseRunner.getResponse(WebHdfsFileSystem.java:727)
> 	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.runWithRetry(WebHdfsFileSystem.java:610)
> 	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.access$100(WebHdfsFileSystem.java:458)
> 	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner$1.run(WebHdfsFileSystem.java:487)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at javax.security.auth.Subject.doAs(Subject.java:422)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
> 	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.run(WebHdfsFileSystem.java:483)
> 	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.listStatus(WebHdfsFileSystem.java:1277)
> {noformat}
> My topology list some files on hdfs using webhdfs API. org.mortbay.util.ajax.JSON was
included in the application uber jar. I noticed that flink loads the application jar in a
child classloader. This is what most likely happened - 
> 1. WebHdfsFileSystem class was loaded through parent class loader since it is included
in flink-dist.jar.
> 2. WebHdfsFileSystem has reference to the org.mortbay.util.ajax.JSON but since it is
loaded through parent class loader, WebHdfsFileSystem can't read a class in child class loader.

> Ideally all the referenced classes should be available in the distribution jar so that
these sort of issues may not occur. 



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