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https://issues.apache.org/jira/browse/HADOOP-14441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang updated HADOOP-14441:
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Attachment: HADOOP-14441.001.patch
Post my v001 patch. It has a simple fix: adding delegation tokens from all KMS
providers.
The unit test runs two KMS to form KMS HA, using ZooKeeper to store delegation
tokens, and use delegation tokens to access without Kerberos to induce the
error (if without the fix).
> LoadBalancingKMSClientProvider#addDelegationTokens should add delegation
> tokens from all KMS instances
> ------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-14441
> URL: https://issues.apache.org/jira/browse/HADOOP-14441
> Project: Hadoop Common
> Issue Type: Bug
> Components: kms
> Affects Versions: 2.7.0
> Environment: CDH5.7.4, Kerberized, SSL, KMS-HA, at rest encryption
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Attachments: HADOOP-14441.001.patch
>
>
> LoadBalancingKMSClientProvider only gets delegation token from one KMS
> instance, in a round-robin fashion. This is arguably a bug, as JavaDoc for
> {{KeyProviderDelegationTokenExtension#addDelegationTokens}} states:
> {quote}
> /**
> * The implementer of this class will take a renewer and add all
> * delegation tokens associated with the renewer to the
> * <code>Credentials</code> object if it is not already present,
> ...
> **/
> {quote}
> This bug doesn't pop up very often, because HDFS clients such as MapReduce
> unintentionally calls {{FileSystem#addDelegationTokens}} multiple times.
> We have a custom client that accesses HDFS/KMS-HA using delegation token, and
> we were puzzled why it always throws "Failed to find any Kerberos tgt"
> exceptions talking to one KMS but not the other. Turns out that client
> couldn't talk to the KMS because {{FileSystem#addDelegationTokens}} only gets
> one KMS delegation token at a time.
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