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https://issues.apache.org/jira/browse/HDFS-14245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16820526#comment-16820526
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Erik Krogen commented on HDFS-14245:
------------------------------------
Just attached my v000 patch. Essentially, if the ORPP is not using a
{{ClientProtocol}}, it turns {{observerReadEnabled}} to false, which will avoid
all of the code that requires the use of a {{ClientProtocol}}. While making
this change, I noticed one thing that I think may be a bug in the
implementation of HDFS-14160, which is that I believe
{{ObserverReadProxyProvider.ObserverReadInvocationHandler#getConnectionId()}}
should probably always be returning the connection ID of the {{failoverProxy}},
as opposed to the observer proxy. I'm verifying and if so, will file a separate
JIRA for this.
> 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: Erik Krogen
> Priority: Major
> Attachments: HDFS-14245.000.patch, 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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