Replace member commit quorum #559
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sanebay
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Codecov ReportAttention: Patch coverage is
❗ Your organization needs to install the Codecov GitHub app to enable full functionality. Additional details and impacted files@@ Coverage Diff @@
## master #559 +/- ##
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+ Coverage 56.51% 67.20% +10.68%
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Files 108 109 +1
Lines 10300 10461 +161
Branches 1402 1407 +5
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+ Hits 5821 7030 +1209
+ Misses 3894 2749 -1145
- Partials 585 682 +97 ☔ View full report in Codecov by Sentry. |
sanebay
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@sanebay lgtm , could you pls update the conan version? |
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| void RaftReplDev::reset_quorum_size(uint32_t commit_quorum) { |
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do we need add some check here to disable setting those quorum sizes without intersection, since it might cause data loss or log diverging.
pls see
https://github.com/eBay/NuRaft/blob/092997ab67eb2529c5b40556e1d301c8220c315d/docs/custom_quorum_size.md?plain=1#L29
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this is used when we have double failure , e.g ( 2 out of 3 members are down )--- so for sure the number seems wrong.
We need other mechanism to shot on the head of other members , ensuring they are deadly dead.
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when we make this config change, there might be some on-going write or delete, we need to carefully handle this quorum size change.
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We need to make these PG's read only as two nodes are down. Will check with CM, in nublocks once removed they are never added back to cluster.
| auto err = m_state_machine->propose_to_raft(std::move(rreq)); | ||
| if (err != ReplServiceError::OK) { | ||
| LOGERROR("Replace member propose to raft failed {}", err); | ||
| reset_quorum_size(0); |
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we also need reset_quorum_size back to 0 in 152 and 132 before we return an error
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