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https://issues.apache.org/jira/browse/HDFS-15383?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang updated HDFS-15383:
-----------------------------------
Fix Version/s: (was: 3.3.6)
> RBF: Disable watch in ZKDelegationSecretManager for performance
> ---------------------------------------------------------------
>
> Key: HDFS-15383
> URL: https://issues.apache.org/jira/browse/HDFS-15383
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Fengnan Li
> Assignee: Fengnan Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> Based on the current design for delegation token in secure Router, the total
> number of watches for tokens is the product of number of routers and number
> of tokens, this is due to ZKDelegationTokenManager is using PathChildrenCache
> from curator, which automatically sets the watch and ZK will push the sync
> information to each router. There are some evaluations about the number of
> watches in Zookeeper has negative performance impact to Zookeeper server.
> In our practice when the number of watches exceeds 1.2 Million in a single ZK
> server there will be significant ZK performance degradation. Thus this ticket
> is to rewrite ZKDelegationTokenManagerImpl.java to explicitly disable the
> PathChildrenCache and have Routers sync periodically from Zookeeper. This has
> been working fine at the scale of 10 Routers with 2 million tokens.
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