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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14445) Delegation tokens are not shared between KMS instances
Date Fri, 02 Jun 2017 18:09:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16035159#comment-16035159
] 

Daryn Sharp commented on HADOOP-14445:
--------------------------------------

bq. It seems unavoidable if we want to implement ksm-nameservice.
I'm not sure what this means but anything config based is not scalable.  Updating configs
of tens of thousands of nodes, launchers, oozie, storm, spark, etc and restarting the services
is just not logistically possible.  This is largely why we added the ability for the NN to
tell the client the kms uri, plus it added much needed multi-kms support.

bq. If user add new KMS and replace KMS, the clients need to be restarted with the new config.
Another illustration of why a config-based approach is a bad idea.  The cleanest way to manage
a kms cluster is transparently via a cname or multi-A record.

I've consulted with Rushabh on the initial design, I'll review the actual patch today.

> Delegation tokens are not shared between KMS instances
> ------------------------------------------------------
>
>                 Key: HADOOP-14445
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14445
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: documentation, kms
>    Affects Versions: 2.8.0, 3.0.0-alpha1
>            Reporter: Wei-Chiu Chuang
>            Assignee: Rushabh S Shah
>         Attachments: HADOOP-14445-branch-2.8.patch
>
>
> As discovered in HADOOP-14441, KMS HA using LoadBalancingKMSClientProvider do not share
delegation tokens. (a client uses KMS address/port as the key for delegation token)
> {code:title=DelegationTokenAuthenticatedURL#openConnection}
> if (!creds.getAllTokens().isEmpty()) {
>         InetSocketAddress serviceAddr = new InetSocketAddress(url.getHost(),
>             url.getPort());
>         Text service = SecurityUtil.buildTokenService(serviceAddr);
>         dToken = creds.getToken(service);
> {code}
> But KMS doc states:
> {quote}
> Delegation Tokens
> Similar to HTTP authentication, KMS uses Hadoop Authentication for delegation tokens
too.
> Under HA, A KMS instance must verify the delegation token given by another KMS instance,
by checking the shared secret used to sign the delegation token. To do this, all KMS instances
must be able to retrieve the shared secret from ZooKeeper.
> {quote}
> We should either update the KMS documentation, or fix this code to share delegation tokens.



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