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https://issues.apache.org/jira/browse/HDFS-17128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17756430#comment-17756430
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ASF GitHub Bot commented on HDFS-17128:
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slfan1989 commented on PR #5963:
URL: https://github.com/apache/hadoop/pull/5963#issuecomment-1685156419
> >
>
> @slfan1989 the checkstyle issue is the pre-existing one on
AbstractDelegationTokenSecretManager that we decided to ignore on the trunk PR:
[#5897
(comment)](https://github.com/apache/hadoop/pull/5897#issuecomment-1666552826)
@hchaverri Thanks for your contribution! merge into branch3.3. @simbadzina
Thanks for helping to review the code!
> RBF: SQLDelegationTokenSecretManager should use version of tokens updated by
> other routers
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-17128
> URL: https://issues.apache.org/jira/browse/HDFS-17128
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: rbf
> Reporter: Hector Sandoval Chaverri
> Priority: Major
> Labels: pull-request-available
> Attachments: HDFS-17128-branch-3.3.patch
>
>
> The SQLDelegationTokenSecretManager keeps tokens that it has interacted with
> in a memory cache. This prevents routers from connecting to the SQL server
> for each token operation, improving performance.
> We've noticed issues with some tokens being loaded in one router's cache and
> later renewed on a different one. If clients try to use the token in the
> outdated router, it will throw an "Auth failed" error when the cached token's
> expiration has passed.
> This can also affect cancelation scenarios since a token can be removed from
> one router's cache and still exist in another one.
> A possible solution is already implemented on the
> ZKDelegationTokenSecretManager, which consists of having an executor
> refreshing each router's cache on a periodic basis. We should evaluate
> whether this will work with the volume of tokens expected to be handled by
> the SQLDelegationTokenSecretManager.
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