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https://issues.apache.org/jira/browse/HDFS-16688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17577467#comment-17577467
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ASF GitHub Bot commented on HDFS-16688:
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snmvaughan opened a new pull request, #4725:
URL: https://github.com/apache/hadoop/pull/4725
### Description of PR
During the JournalNode startup, it builds the list of servers in the
JournalNode set, ignoring hostnames that cannot be resolved. In environments
with dynamic IP address allocations this means that the JournalNodeSyncer will
never sync with hosts that aren't resolvable during startup.
Allow unresolved names during startup, so that when the hosts become
available they will be included in JournalNode synchronization. This also
requires that mechanisms that return a string representation which includes the
IP address had to be updated to handle unresolved addresses.
### How was this patch tested?
Integration tests were performed against an HA configuration running in
Kubernetes, running Java 11. Starting the cluster with fewer replicas than the
list of JournalNodes listed in the configurations started, and the logs showed
attempts to sync against the missing replicas. Missing instances of the
JournalNode were incorporated into synchronization and NameNode shared edits
once they were started without any intervention.
### For code changes:
- [X] 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?
> Unresolved Hosts during startup are not synced by JournalNodes
> --------------------------------------------------------------
>
> Key: HDFS-16688
> URL: https://issues.apache.org/jira/browse/HDFS-16688
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: journal-node
> Environment: Running in Kubernetes using Java 11, with an HA
> configuration.
> Reporter: Steve Vaughan
> Assignee: Steve Vaughan
> Priority: Major
>
> During the JournalNode startup, it builds the list of servers in the
> JournalNode set, ignoring hostnames that cannot be resolved. In environments
> with dynamic IP address allocations this means that the JournalNodeSyncer
> will never sync with hosts that aren't resolvable during startup.
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