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https://issues.apache.org/jira/browse/HADOOP-15336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16417812#comment-16417812
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Sherwood Zheng commented on HADOOP-15336:
-----------------------------------------
The problem happens when I was testing the router. The client and router were
3.2 and name node was 2.7. The problem is that 2.7 NN would return null for
keyProviderUri, which would cause NPE when the router is calling
setKeyProviderUri(), which happens during the router is preparing the result to
send back to the client, here is the error trace on the router side. It is a
backward compatiability issue in a sense that the client side talking to the
namenode should handle the case when the keyProviderUri is returned as null.
org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException):
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.protocol.proto.HdfsProtos$FsServerDefaultsProto$Builder.setKeyProviderUri(HdfsProtos.java:37035)
at
org.apache.hadoop.hdfs.protocolPB.PBHelperClient.convert(PBHelperClient.java:2159)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getServerDefaults(ClientNamenodeProtocolServerSideTranslatorPB.java:444)
at
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:869)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:815)
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:1682)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2675)
> NPE for FsServerDefaults.getKeyProviderUri() for clientProtocol communication
> between 2.7 and 3.2
> -------------------------------------------------------------------------------------------------
>
> Key: HADOOP-15336
> URL: https://issues.apache.org/jira/browse/HADOOP-15336
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 3.1.0, 3.2.0
> Reporter: Sherwood Zheng
> Assignee: Sherwood Zheng
> Priority: Major
> Labels: backward-incompatible, common
>
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