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https://issues.apache.org/jira/browse/HADOOP-19966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18115470#comment-18115470
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ASF GitHub Bot commented on HADOOP-19966:
-----------------------------------------
pan3793 commented on PR #8688:
URL: https://github.com/apache/hadoop/pull/8688#issuecomment-5677391891
@Hexiaoqiao Token verify/renew/cancel are not affected: `getTokenInfo` and
`getDelegationKey` fall back to ZK on a cache miss. The in-memory load exists
for the expired-token remover, which only scans `currentTokens` (HADOOP-13487).
That relied on PathChildrenCache `BUILD_INITIAL_CACHE` being synchronous;
HADOOP-17835 (3.4.0) switched to `CuratorCache.start()`, which is asynchronous.
The listener still fills the map a few seconds later, so the lasting effects
are: token owner stats (Router `getTopTokenRealOwners`) are computed from a
partial map and never corrected for pre-restart tokens, the root container
znode is parsed on every startup and logs an ERROR, and
`testNodesLoadedAfterRestart` is flaky in CI. Router with the token watcher
disabled uses its own synchronous `rebuildTokenCache` and is unaffected.
Retitled the PR and rewrote the description accordingly.
> ZKDelegationTokenSecretManager may fail to load tokens and keys from
> ZooKeeper on startup
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-19966
> URL: https://issues.apache.org/jira/browse/HADOOP-19966
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Cheng Pan
> Priority: Major
> Labels: pull-request-available
>
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