Auto-expand replicas only after failing nodes #30553
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ywelsch
added
>bug
v7.0.0
:Distributed Coordination/Allocation
|
Pinging @elastic/es-distributed |
bleskes
approved these changes
May 14, 2018
…as-on-node-removal
|
Thanks @bleskes |
ywelsch
added a commit
that referenced
this pull request
May 14, 2018
#30423 combined auto-expansion in the same cluster state update where nodes are removed. As the auto-expansion step would run before deassociating the dead nodes from the routing table, the auto-expansion would possibly remove replicas from live nodes instead of dead ones. This commit reverses the order to ensure that when nodes leave the cluster that the auto-expand-replica functionality only triggers after failing the shards on the removed nodes. This ensures that active shards on other live nodes are not failed if the primary resided on a now dead node. Instead, one of the replicas on the live nodes first gets promoted to primary, and the auto- expansion (removing replicas) only triggers in a follow-up step (but still same cluster state update). Relates to #30456 and follow-up of #30423
dnhatn
added a commit
that referenced
this pull request
May 15, 2018
* 6.x: Revert "Silence IndexUpgradeIT test failures. (#30430)" [DOCS] Remove references to changelog and to highlights Revert "Mute ML upgrade test (#30458)" [ML] Fix BWC version for backport of #30125 [Docs] Improve section detailing translog usage (#30573) [Tests] Relax allowed delta in extended_stats aggregation (#30569) Fail if reading from closed KeyStoreWrapper (#30394) [ML] Reverse engineer Grok patterns from categorization results (#30125) Derive max composite buffers from max content len Update build file due to doc file rename SQL: Extract SQL request and response classes (#30457) Remove the changelog (#30593) Revert "Add deprecation warning for default shards (#30587)" Silence IndexUpgradeIT test failures. (#30430) Add deprecation warning for default shards (#30587) [DOCS] Adds 6.4.0 release highlight pages [DOCS] Adds release highlight pages (#30590) Docs: Document how to rebuild analyzers (#30498) [DOCS] Fixes title capitalization in security content LLRest: Add equals and hashcode tests for Request (#30584) [DOCS] Fix realm setting names (#30499) [DOCS] Fix path info for various security files (#30502) Docs: document precision limitations of geo_bounding_box (#30540) Fix non existing javadocs link in RestClientTests Auto-expand replicas only after failing nodes (#30553)
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#30423 combined auto-expansion in the same cluster state update where nodes are removed. As the auto-expansion step would run before deassociating the dead nodes from the routing table, the auto-expansion would possibly remove replicas from live nodes instead of dead ones. This PR reverses the order to ensure that when nodes leave the cluster that the auto-expand-replica functionality only triggers after failing the shards on the removed nodes. This ensures that active shards on other live nodes are not failed if the primary resided on a now dead node.
Instead, one of the replicas on the live nodes first gets promoted to primary, and the auto-expansion (removing replicas) only triggers in a follow-up step (but still same cluster state update).
Relates to #30456 (comment)
and follow-up of #30423