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https://issues.apache.org/jira/browse/HADOOP-14445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430803#comment-16430803
 ] 

Rushabh S Shah commented on HADOOP-14445:
-----------------------------------------

[~xiaochen]: Thanks for the latest patch.
bq. Testing this in real clusters revealed some issues in the patch.
Good find. The problem in creating the patch is there are 3 moving components 
and making sure the patch covers all the cases is pretty difficult.

Overall the patch looks good.
Just one minor comment in new added test class.
+TestKMSClientProvider.java+
1. 
{code}
  public void testNotCopyFromLegacyToken() throws Exception {
    ...
    assertNotEquals(uriString, tokens[0].getService().toString());
    ...
{code}
Instead of asserting what it is not equal to, we should assert what it should 
be equal to.

> 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: kms
>    Affects Versions: 2.8.0, 3.0.0-alpha1
>         Environment: CDH5.7.4, Kerberized, SSL, KMS-HA, at rest encryption
>            Reporter: Wei-Chiu Chuang
>            Assignee: Xiao Chen
>            Priority: Major
>         Attachments: HADOOP-14445-branch-2.8.002.patch, 
> HADOOP-14445-branch-2.8.patch, HADOOP-14445.002.patch, 
> HADOOP-14445.003.patch, HADOOP-14445.004.patch, HADOOP-14445.05.patch, 
> HADOOP-14445.06.patch, HADOOP-14445.07.patch, HADOOP-14445.08.patch, 
> HADOOP-14445.09.patch, HADOOP-14445.10.patch, HADOOP-14445.11.patch, 
> HADOOP-14445.12.patch, HADOOP-14445.branch-2.01.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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