Botong Huang created YARN-6093:
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Summary: Invalid AMRM token exception when RM renew AMRMtoken and
FederationRMFailoverProxyProvider failover
Key: YARN-6093
URL: https://issues.apache.org/jira/browse/YARN-6093
Project: Hadoop YARN
Issue Type: Bug
Components: federation
Reporter: Botong Huang
Assignee: Botong Huang
Priority: Minor
Fix For: YARN-2915
AMRMProxy uses expired AMRMToken to talk to RM, leading to the "Invalid
AMRMToken" exception. The bug is triggered when both conditions are met:
1. RM rolls master key and renews AMRMToken for a running AM.
2. Existing RPC connection between AMRMProxy and RM drops and attempt to
reconnect via failover in FederationRMFailoverProxyProvider.
Here's what happened:
In DefaultRequestInterceptor.init(), we create a proxy ugi, load it with the
initial AMRMToken issued by RM, and used it for initiating rmClient.
Then we arrive at FederationRMFailoverProxyProvider.init(), a full copy of ugi
tokens are saved locally, create an actual RM proxy and setup the RPC
connection.
Later when RM rolls master key and issues a new AMRMToken,
DefaultRequestInterceptor.updateAMRMToken() updates it into the proxy ugi.
However the new token is never used until the existing RPC connection between
AMRMProxy and RM drops for other reasons (say master RM crashes).
At this point, since the service name of the new AMRMToken is not yet set
correctly in DefaultRequestInterceptor.updateAMRMToken(), RPC found no valid
AMRMToken when trying to setup a new connection.
We first hit a "Client cannot authenticate via:[TOKEN]" exception. This is
expected.
Next, FederationRMFailoverProxyProvider fails over, we reset the service token
via ClientRMProxy.getRMAddress() and reconnect. Supposedly this would have
worked.
However since DefaultRequestInterceptor does not use the proxy user for later
calls to rmClient, when performing failover in
FederationRMFailoverProxyProvider, we are not in the proxy user.
Currently the code solve the problem by reloading the current ugi with all
tokens saved locally in originalTokens in method addOriginalTokens().
The problem is that the original AMRMToken loaded is no longer accepted by RM,
and thus we keep hitting the "Invalid AMRMToken" exception until AM fails.
The correct way is that rather than saving the original tokens in the proxy
ugi, we save the original ugi itself.
Every time we perform failover and create the new RM proxy, we use the original
ugi, which is always loaded with the up-to-date AMRMToken.
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