sunchao commented on pull request #4007:
URL: https://github.com/apache/hadoop/pull/4007#issuecomment-1047439392
I see. Didn't know the context. It's a bit confusing to see the stack trace
like this though:
```
PrivilegedAction [as: <principal> (auth:KERBEROS)][action:
org.apache.hadoop.ipc.Client$Connection$2@65fa2f2d]
java.lang.Exception: null
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1875)
~[hadoop-client-api-3.3.1.jar:?]
at
org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:838)
~[hadoop-client-api-3.3.1.jar:?]
at org.apache.hadoop.ipc.Client$Connection.access$3800(Client.java:414)
~[hadoop-client-api-3.3.1.jar:?]
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1654)
~[hadoop-client-api-3.3.1.jar:?]
at org.apache.hadoop.ipc.Client.call(Client.java:1479)
~[hadoop-client-api-3.3.1.jar:?]
at org.apache.hadoop.ipc.Client.call(Client.java:1432)
~[hadoop-client-api-3.3.1.jar:?]
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Invoker.invoke(ProtobufRpcEngine2.java:242)
~[hadoop-client-api-3.3.1.jar:?]
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Invoker.invoke(ProtobufRpcEngine2.java:129)
~[hadoop-client-api-3.3.1.jar:?]
at com.sun.proxy.$Proxy14.delete(Unknown Source) ~[?:?]
```
and it could makes people think there's something wrong in the `doAs`
method. Maybe we can strip the first line of the stacktrace and replace with
something like:
```
PrivilegedAction [as: <principal> (auth:KERBEROS)][action:
org.apache.hadoop.ipc.Client$Connection$2@65fa2f2d]
Call stacktrace:
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1875)
~[hadoop-client-api-3.3.1.jar:?]
```
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