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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11908) libhdfs++: Authentication failure when first NN of kerberized HA cluster is standby
Date Fri, 07 Jul 2017 20:06:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078606#comment-16078606

James Clampffer commented on HDFS-11908:

Thanks for reviewing [~anatoli.shein].

I agree about adding CI tests.  This fix is being indirectly tested since it's integrated
into another product, goes through tests where NNs are turned on and off and standby/active
and lots of concurrent connection attempts with different principals.  I'm going to start
getting the minidfscluster testing in better shape since this bug never should have made it
into the code.

> libhdfs++: Authentication failure when first NN of kerberized HA cluster is standby
> -----------------------------------------------------------------------------------
>                 Key: HDFS-11908
>                 URL: https://issues.apache.org/jira/browse/HDFS-11908
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>         Attachments: HDFS-11908.HDFS-8707.000.patch
> Library won't properly authenticate to kerberized HA cluster if the first namenode it
tries to connect to is the standby.  RpcConnection ends up attempting to use simple auth.
> Control flow to connect to NN for the first time:
> # RpcConnection constructed with a pointer to the RpcEngine as the only argument
> # RpcConnection::Connect(server endpoints, auth_info, callback called)
> ** auth_info contains the SASL mechanism to use + the delegation token if we already
have one
> Control flow to connect to NN after failover:
> # RpcEngine::NewConnection called, allocates an RpcConnection exactly how step 1 above
> # RpcEngine::InitializeConnection called, sets event hooks and a string for cluster name
> # Rpc calls sent using RpcConnection::PreEnqueueRequests called to add RPC message that
didn't make it on last call due to standby exception
> # RpcConnection::ConnectAndFlush called to send RPC packets. This only takes server endpoints,
no auth info
> To fix:
> RpcEngine::InitializeConnection just needs to set RpcConnection::auth_info_ from the
existing RpcEngine::auth_info_, even better would be setting this in the constructor so if
an RpcConnection exists it can be expected to be in a usable state.  I'll get a diff up once
I sort out CI build failures.
> Also really need to get CI test coverage for HA and kerberos because this issue should
not have been around for so long.

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