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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 16:00:19 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15139108#comment-15139108

ASF GitHub Bot commented on FLINK-3271:

Github user abhishekagarwal87 commented on a diff in the pull request:

    --- Diff: flink-shaded-hadoop/pom.xml ---
    @@ -111,6 +111,7 @@ under the License.
    +									<include>org.mortbay.jetty:*</include>
    --- End diff --
    Hadoop classes are being included in the fat jar but are not being hidden. That leads
to the error scenario, this PR intends to solve. 

> 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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