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https://issues.apache.org/jira/browse/HADOOP-13487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15431545#comment-15431545
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Xiao Chen commented on HADOOP-13487:
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Hi [~axenol],
Yes, the workflow works, because after restart, although the secret manager
doesn't have the token in cache ({{currentTokens}}, it will fall back to read
from zk.
([code|https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/ZKDelegationTokenSecretManager.java#L616]).
The problem is, the token removal thread is only checking the in-memory cache.
So if there's an old token in ZK and nobody is using it, it will not be loaded
to {{currentTokens}} for the removal thread to process.
Also, since we're already loading {{PathChildrenCache}} for tokens and master
keys at startup, I think syncing the in-memory cache is the right thing to do.
> Hadoop KMS should load old delegation tokens from Zookeeper on startup
> ----------------------------------------------------------------------
>
> Key: HADOOP-13487
> URL: https://issues.apache.org/jira/browse/HADOOP-13487
> Project: Hadoop Common
> Issue Type: Bug
> Components: kms
> Affects Versions: 2.6.0
> Reporter: Alex Ivanov
> Assignee: Xiao Chen
> Attachments: HADOOP-13487.01.patch, HADOOP-13487.02.patch,
> HADOOP-13487.03.patch, HADOOP-13487.04.patch
>
>
> Configuration:
> CDH 5.5.1 (Hadoop 2.6+)
> KMS configured to store delegation tokens in Zookeeper
> DEBUG logging enabled in /etc/hadoop-kms/conf/kms-log4j.properties
> Findings:
> It seems to me delegation tokens never get cleaned up from Zookeeper past
> their renewal date. I can see in the logs that the removal thread is started
> with the expected interval:
> {code}
> 2016-08-11 08:15:24,511 INFO AbstractDelegationTokenSecretManager - Starting
> expired delegation token remover thread, tokenRemoverScanInterval=60 min(s)
> {code}
> However, I don't see any delegation token removals, indicated by the
> following log message:
> org.apache.hadoop.security.token.delegation.ZKDelegationTokenSecretManager
> --> removeStoredToken(TokenIdent ident), line 769 [CDH]
> {code}
> if (LOG.isDebugEnabled()) {
> LOG.debug("Removing ZKDTSMDelegationToken_"
> + ident.getSequenceNumber());
> }
> {code}
> Meanwhile, I see a lot of expired delegation tokens in Zookeeper that don't
> get cleaned up.
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