[HDFS-14245] Class cast error in GetGroups with ObserverReadProxyProvider

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: HDFS-12943
• Fix Version/s: 2.10.0, 3.3.0, 3.1.4, 3.2.2
• Hadoop Flags: Reviewed
• Assignee: Erik Krogen
• Reporter: Shen Yinjie
• Created: 31/Jan/19 02:42
• Updated: 11/Oct/19 19:14
• Resolved: 10/Oct/19 16:23

Description

Run "hdfs groups" with ObserverReadProxyProvider, Exception throws as :

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

similar with HDFS-14116, we did a simple fix.

Issue Links

• is related to: HDFS-14162 Balancer should work with ObserverNode
• relates to: HDFS-14893 TestDelegationTokensWithHA.testObserverReadProxyProviderWithDT failing on branch-2
• relates to: HDFS-12943 Consistent Reads from Standby Node
• supercedes: HDFS-14893 TestDelegationTokensWithHA.testObserverReadProxyProviderWithDT failing on branch-2