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Subject [GitHub] [zookeeper] hanm commented on issue #1048: ZOOKEEPER-3188: Improve resilience to network
Date Thu, 29 Aug 2019 23:27:27 GMT
hanm commented on issue #1048: ZOOKEEPER-3188: Improve resilience to network
URL: https://github.com/apache/zookeeper/pull/1048#issuecomment-526397890
   nice work on rebase and doing cluster level testing on the patch
   a few things I'd like to discuss:
   * What's the impact on dynamic reconfiguration - what's allowed / working and what's not
allowed / not working when reconfiguring server's address now with this feature? Once this
is concluded, some unit tests and cluster level testing would be good. I think @enixon also
asked about this in https://github.com/apache/zookeeper/pull/730.
   * Impact on upgrading / downgrading: this was discussed on the JIRA, should be tested at
cluster level and document it on upgrade FAQ wiki and/or zookeeper document.
   * Impact on quorum TLS/kerberos feature: this was also discussed on JIRA, but not concluded
   * Unit test coverage: I think the current unit tests don't cover well the new code path
when there is multiple addresses configured. We have quorum manager test, leader election
tests, and so on; but those tests are still executed with a single address configured (even
though the interfaces changed to multiple address). Would be good to upgrade relevant tests
and make sure we have a relevant good coverage on networking code path with multiple addresses
   My current evaluation of the patch is the risk is fairly low if we merge this, as long
as we still stick to single address configuration. Though I'd like to conclude the above discussions
so we know what we will be getting into if something goes wrong.

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