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https://issues.apache.org/jira/browse/HDFS-17529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17847230#comment-17847230
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ASF GitHub Bot commented on HDFS-17529:
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kokonguyen191 opened a new pull request, #6833:
URL: https://github.com/apache/hadoop/pull/6833
### Description of PR
Current implementation for router state store update is quite inefficient,
so much that when routers are removed and a lot of NameNodeMembership records
are deleted in a short burst, the deletions triggered a router safemode in our
cluster and caused a lot of troubles.
This ticket contains 2 parts: improving the deletion process for ZK state
store implementation, and allowing the overwrite part and delete part of
org.apache.hadoop.hdfs.server.federation.store.CachedRecordStore#overrideExpiredRecords
to run in parallel.
### How was this patch tested?
UT
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
> Improve router state store cache update
> ---------------------------------------
>
> Key: HDFS-17529
> URL: https://issues.apache.org/jira/browse/HDFS-17529
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, rbf
> Reporter: Felix N
> Assignee: Felix N
> Priority: Major
>
> Current implementation for router state store update is quite inefficient, so
> much that when routers are removed and a lot of NameNodeMembership records
> are deleted in a short burst, the deletions triggered a router safemode in
> our cluster and caused a lot of troubles.
> This ticket contains 2 parts: improving the deletion process for ZK state
> store implementation, and allowing the overwrite part and delete part of
> org.apache.hadoop.hdfs.server.federation.store.CachedRecordStore#overrideExpiredRecords
> to run in parallel.
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