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HADOOP-18365. Update the remote address when a change is detected

Open snmvaughan opened this issue 3 years ago • 6 comments

Avoid reconnecting to the old address after detecting that the address has been updated.

Description of PR

When the IPC Client recognizes that an IP address has changed, it updates the server field and logs a message:

Address change detected. Old: journalnode-1.journalnode.hdfs.svc.cluster.local/10.1.0.178:8485 New: journalnode-1.journalnode.hdfs.svc.cluster.local/10.1.0.182:8485

Although the change is detected, the client will continue to connect to the old IP address, resulting in repeated log messages. This is seen in managed environments when JournalNode syncing is enabled and a JournalNode is restarted, with the remaining nodes in the set repeatedly logging this message when syncing to the restarted JournalNode.

The source of the problem is that the remoteId.address is not updated.

How was this patch tested?

HA configuration deployed on a Kubernetes cluster, using Java 11.

  1. Deleted an individual JournalNode pod
  2. Looked for "Address change detected" messages from each other JournalNode
  3. Looked for "Address change detected" messages from each NameNode (Active and Standby)
  4. Waiting long enough for the JounalNodeSyncer to wrap back around to the Restarted JournalNode to ensure that the message wasn't repeated and communications went directly to the new instance
  5. Waited long enough for the NameNodes to push to the restarted JournalNode, restarting other JournalNodes if necessary as a forcing function, to ensure that the message wasn't repeated and communications went directly to the new instance

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?
  • [ ] If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

snmvaughan avatar Aug 03 '22 19:08 snmvaughan

:broken_heart: -1 overall

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251m 31s
Reason Tests
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Subsystem Report/Notes
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hadoop-yetus avatar Aug 03 '22 23:08 hadoop-yetus

:broken_heart: -1 overall

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Reason Tests
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hadoop-yetus avatar Aug 04 '22 19:08 hadoop-yetus

:broken_heart: -1 overall

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hadoop-yetus avatar Aug 06 '22 18:08 hadoop-yetus

I need to add an additional test to demonstrate that the in addition to the update being handled, it avoids having to repeat the process. The current patch fixed the existing unit test that correctly identified that the updated address caused problems with cleanup, but it didn't catch that the original (incorrect) IP address would be attempted again.

snmvaughan avatar Aug 07 '22 19:08 snmvaughan

:confetti_ball: +1 overall

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hadoop-yetus avatar Aug 08 '22 18:08 hadoop-yetus

:confetti_ball: +1 overall

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versions git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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hadoop-yetus avatar Aug 11 '22 18:08 hadoop-yetus