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https://issues.apache.org/jira/browse/HDFS-15845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17288484#comment-17288484
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Íñigo Goiri commented on HDFS-15845:
------------------------------------
Quoting [~LiJinglun] for reference.
> RBF: Router fails to start due to NoClassDefFoundError for
> hadoop-federation-balance
> ------------------------------------------------------------------------------------
>
> Key: HDFS-15845
> URL: https://issues.apache.org/jira/browse/HDFS-15845
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Takanobu Asanuma
> Assignee: Takanobu Asanuma
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {noformat}
> $ hdfs dfsrouter
> ...
> 2021-02-22 17:21:55,400 ERROR router.DFSRouter: Failed to start router
> java.lang.NoClassDefFoundError:
> org/apache/hadoop/tools/fedbalance/procedure/BalanceProcedure
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterClientProtocol.<init>(RouterClientProtocol.java:195)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.<init>(RouterRpcServer.java:394)
> at
> org.apache.hadoop.hdfs.server.federation.router.Router.createRpcServer(Router.java:391)
> at
> org.apache.hadoop.hdfs.server.federation.router.Router.serviceInit(Router.java:188)
> at
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:165)
> at
> org.apache.hadoop.hdfs.server.federation.router.DFSRouter.main(DFSRouter.java:69)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.hadoop.tools.fedbalance.procedure.BalanceProcedure
> at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> ... 6 more
> 2021-02-22 17:21:55,402 INFO util.ExitUtil: Exiting with status 1:
> java.lang.NoClassDefFoundError:
> org/apache/hadoop/tools/fedbalance/procedure/BalanceProcedure
> 2021-02-22 17:21:55,404 INFO router.DFSRouter: SHUTDOWN_MSG:
> {noformat}
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