Fix size of rolling-upgrade bootstrap config #38031
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DaveCTurner
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:Distributed Coordination/Cluster Coordination
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Today a Zen2 node will bootstrap itself once it believes there to be no remaining Zen1 master-eligible nodes in the cluster as long as minimum_master_nodes is satisfied. However the bootstrap configuration comprises just the ids of the known master-eligible nodes, and this might be too small to be safe. For instance, if there are 5 master-eligible nodes (so that minimum_master_nodes is 3) then the bootstrap configuration could comprise just 3 nodes, of which 2 form a quorum, and this does not intersect other quorums that might arise, leading to a split-brain. This commit fixes this by expanding the bootstrap configuration so that its quorums satisfy minimum_master_nodes, using known node IDs if possible and placeholders if not.
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ywelsch
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jasontedor
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* master: (100 commits) Push primary term to replication tracker (elastic#38044) Introduce ability to minimize round-trips in CCS (elastic#37828) Don't Assert Ack on when Publish Timeout is 0 in Test (elastic#38077) Reduce object creation in Rounding class (elastic#38061) Treat put-mapping calls with `_doc` as a top-level key as typed calls. (elastic#38032) Fix test bug when testing the merging of mappings and templates. (elastic#38021) spelling: java script -- not JavaScript (elastic#37057) Enable SSL in reindex with security QA tests (elastic#37600) Disable BWC tests during backport (elastic#38074) SQL: Added SSL configuration options tests (elastic#37875) Minor fixes in the release notes script. (elastic#37967) Fix typo in docs. (elastic#38018) Update Lucene repo for 7.0.0-alpha2 (elastic#37985) Fix size of rolling-upgrade bootstrap config (elastic#38031) fix DateIndexNameProcessorTests offset pattern (elastic#38069) Speed up converting of temporal accessor to zoned date time (elastic#37915) Work around JDK8 timezone bug in tests (elastic#37968) Correct arg names when update mapping/settings from leader (elastic#38063) Introduce ssl settings to reindex from remote (elastic#37527) Mute testRetentionLeasesSyncOnExpiration ...
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Zen2 nodes will bootstrap themselves once they believe there to be no remaining
Zen1 master-eligible nodes in the cluster, as long as minimum_master_nodes is
satisfied.
Today the bootstrap configuration comprises just the ids of the known
master-eligible nodes, and this might be too small to be safe. For instance, if
there are 5 master-eligible nodes (so that minimum_master_nodes is 3) then the
bootstrap configuration could comprise just 3 nodes, of which 2 form a quorum,
and this does not intersect other quorums that might arise, leading to a
split-brain.
This commit fixes this by expanding the bootstrap configuration so that its
quorums satisfy minimum_master_nodes, by adding some of the IDs of the other
master-eligible nodes in the last-published cluster state.