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Posted to issues@flink.apache.org by "Abhishek Agarwal (JIRA)" <ji...@apache.org> on 2016/01/21 19:53:40 UTC
[jira] [Updated] (FLINK-3271) Using webhdfs in a flink topology
throws classnotfound exception
[ https://issues.apache.org/jira/browse/FLINK-3271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Abhishek Agarwal updated FLINK-3271:
------------------------------------
Description:
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.
was:
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 is included in the 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.
> 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
>
> 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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