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https://issues.apache.org/jira/browse/HDFS-14245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16761341#comment-16761341
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Wei-Chiu Chuang commented on HDFS-14245:
----------------------------------------
I am trying to review this patch. But it's not intuitive to me why switching
from NameNodeProxies.createProxy() to NameNodeProxies.createNonHAProxy() does
the trick. It would be helpful to understand why or maybe update javadoc.
[~xkrogen]
> Class cast error in GetGroups with ObserverReadProxyProvider
> ------------------------------------------------------------
>
> Key: HDFS-14245
> URL: https://issues.apache.org/jira/browse/HDFS-14245
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: HDFS-12943
> Reporter: Shen Yinjie
> Assignee: Shen Yinjie
> Priority: Major
> Attachments: HDFS-14245.patch
>
>
> Run "hdfs groups" with ObserverReadProxyProvider, Exception throws as :
> {code:java}
> Exception in thread "main" java.io.IOException: Couldn't create proxy
> provider class
> org.apache.hadoop.hdfs.server.namenode.ha.ObserverReadProxyProvider
> at
> org.apache.hadoop.hdfs.NameNodeProxiesClient.createFailoverProxyProvider(NameNodeProxiesClient.java:261)
> at
> org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:119)
> at
> org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:95)
> at org.apache.hadoop.hdfs.tools.GetGroups.getUgmProtocol(GetGroups.java:87)
> at org.apache.hadoop.tools.GetGroupsBase.run(GetGroupsBase.java:71)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
> at org.apache.hadoop.hdfs.tools.GetGroups.main(GetGroups.java:96)
> Caused by: java.lang.reflect.InvocationTargetException
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
> at
> org.apache.hadoop.hdfs.NameNodeProxiesClient.createFailoverProxyProvider(NameNodeProxiesClient.java:245)
> ... 7 more
> Caused by: java.lang.ClassCastException:
> org.apache.hadoop.hdfs.server.namenode.ha.NameNodeHAProxyFactory cannot be
> cast to org.apache.hadoop.hdfs.server.namenode.ha.ClientHAProxyFactory
> at
> org.apache.hadoop.hdfs.server.namenode.ha.ObserverReadProxyProvider.<init>(ObserverReadProxyProvider.java:123)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.ObserverReadProxyProvider.<init>(ObserverReadProxyProvider.java:112)
> ... 12 more
> {code}
> similar with HDFS-14116, we did a simple fix.
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