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[1sp] Raft: document the new Pre-Vote stage in leader election process #2593

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Closed
Tracked by #2592
veod32 opened this issue Jan 21, 2022 · 1 comment · Fixed by #2933
Closed
Tracked by #2592

[1sp] Raft: document the new Pre-Vote stage in leader election process #2593

veod32 opened this issue Jan 21, 2022 · 1 comment · Fixed by #2933
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feature A new functionality raft [area] Related to RAFT server [area] Task relates to Tarantool's server (core) functionality

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veod32 commented Jan 21, 2022 •
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Epic: #2592

Product: Tarantool
Since: 2.10.0
Dev issue: tarantool/tarantool#6654
Root document: https://www.tarantool.io/en/doc/latest/book/replication/repl_leader_elect/#leader-election-process
SME: @ sergepetrenko

Details

[input from dev issue]
When a server gets partitioned from the majority of the cluster, it starts incrementing its term every election_timeout, trying to win elections. Once such a server reunites with the cluster it unintentionally disrupts the current working leader. The leader steps off seeing a greater term number. This makes the whole cluster go through at least one round of elections, rendering it read-only for a couple of seconds.

Diego Ongaro's thesis covers this issue and suggests adding a Pre-Vote stage to Raft

TDB details of the implementation of the Pre-Vote stage in Tarantool

ToDo

  • Update the description of the leader election process starting from this sentence: "So if there are no heartbeats for a period set by the replication_timeout option, a new election starts." The process will be different with the Pre-Vote stage
@veod32 veod32 added server [area] Task relates to Tarantool's server (core) functionality feature A new functionality raft [area] Related to RAFT labels Jan 21, 2022
@veod32 veod32 mentioned this issue Jan 21, 2022
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@veod32 veod32 self-assigned this Jun 6, 2022
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veod32 commented Jun 6, 2022 •
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Also, the doc issue #2837 is related to the pre-vote dev ticket (tarantool/tarantool#6654) and should be done as well.

@veod32 veod32 added 1sp and removed 3sp labels Jun 7, 2022
@veod32 veod32 changed the title [3pt] Raft: document the new Pre-Vote stage in leader election process [1sp] Raft: document the new Pre-Vote stage in leader election process Jun 7, 2022
veod32 added a commit that referenced this issue Jun 8, 2022
@veod32
Update conditions for a new leader election start.
71d2cc4 
Part of #2593
@veod32 veod32 linked a pull request Jun 8, 2022 that will close this issue
[Raft] Documentation updates related to the Pre-vote stage implementation #2933
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veod32 added a commit that referenced this issue Jun 8, 2022
@veod32
Add description of the leader_idle field; restructure the box.info.el…
866c55d 
…ection description

Part of #2593
veod32 added a commit that referenced this issue Jun 8, 2022
@veod32
Add description of the new fields in the IPROTO_RAFT request
224453b 
Part of #2593
veod32 added a commit that referenced this issue Jun 8, 2022
@veod32
Add info about Tarantool version the changes are available from
81f3b38 
Part of #2593
veod32 added a commit that referenced this issue Jun 14, 2022
@veod32
Update conditions for a new leader election start.
9867662 
Part of #2593
veod32 added a commit that referenced this issue Jun 14, 2022
@veod32
Add description of the leader_idle field; restructure the box.info.el…
3c1845d 
…ection description

Part of #2593
veod32 added a commit that referenced this issue Jun 14, 2022
@veod32
Add description of the new fields in the IPROTO_RAFT request
aab436c 
Part of #2593
veod32 added a commit that referenced this issue Jun 14, 2022
@veod32
Add info about Tarantool version the changes are available from
c50cce2 
Part of #2593
veod32 added a commit that referenced this issue Jun 15, 2022
@veod32
Update the description according to the review comments
7b96f3d 
Part of #2593
veod32 added a commit that referenced this issue Jun 16, 2022
@veod32
Correct formatting
c66b3ff 
Part of #2593
veod32 added a commit that referenced this issue Jun 16, 2022
@veod32
[Raft] Documentation updates related to the Pre-vote stage implementa…
1711056 
…tion (#2933)

replication: update the leader election related articles

* Update conditions for a new leader election start
* Restructure the box.info.election description
* Add description of the leader_idle field in box.info.election
* Add description of the new fields in the IPROTO_RAFT request

Closes #2593, #2837
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[Raft] Documentation updates related to the Pre-vote stage implementation tarantool/doc
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