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https://issues.apache.org/jira/browse/HADOOP-14445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16269159#comment-16269159
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Daryn Sharp commented on HADOOP-14445:
--------------------------------------
The super easy solution to compatibility: if kp conf is set, unconditionally
use it, else use the token's service to instantiate the provider.
Today the token service is irrelevant and there "can be only one provider" per
the conf. Let's keep that. It's compatible for both old/new clients
submitting jobs.
Before enabling the new behavior, leave the RM's kp conf set during the
transition. New clients acquire tokens with a service uri but it continues to
be ignored by the RM. When all clients are upgraded, remove the kp conf from
the RM's conf. Done.
> 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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