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https://issues.apache.org/jira/browse/HDFS-17514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17844587#comment-17844587
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ASF GitHub Bot commented on HDFS-17514:
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simbadzina opened a new pull request, #6804:
URL: https://github.com/apache/hadoop/pull/6804
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### Description of PR
When a namenode that had "dfs.namenode.state.context.enabled" set to true is
restarted with the configuration set to false, routers will keep using a
previously cached state ID.
Without RBF
- clients that fetched the old stateID could have stale reads even after
msyncing
- new clients will go to the active.
With RBF
- client that fetched the old stateID could have stale reads like above.
- New clients will also fetch the stale stateID and potentially have stale
reads
New clients that are created after the restart should not fetch the stale
state ID.
### How was this patch tested?
New unit test
Unit test fails with the patch is PoolAlignmentContext in the second commit.
Unit test pass with the patch.
### For code changes:
- [ ] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
> RBF: Routers keep using cached stateID even when active NN returns unset
> header
> -------------------------------------------------------------------------------
>
> Key: HDFS-17514
> URL: https://issues.apache.org/jira/browse/HDFS-17514
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: rbf
> Reporter: Simbarashe Dzinamarira
> Assignee: Simbarashe Dzinamarira
> Priority: Minor
>
> When a namenode that had "dfs.namenode.state.context.enabled" set to true is
> restarted with the configuration set to false, routers will keep using a
> previously cached state ID.
> Without RBF
> * clients that fetched the old stateID could have stale reads even after
> msyncing
> * new clients will go to the active.
> With RBF
> * client that fetched the old stateID could have stale reads like above.
> * New clients will also fetch the stale stateID and potentially have stale
> reads
> New clients that are created after the restart should not fetch the stale
> state ID.
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