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Clarify documentation of probing

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- Add a large detailed comment about the use and necessity of
  both the follower and leader probing optimization
- fix the log message in stepLeader that previously mixed up the
  log term for the rejection and the index of the append
- improve the test via subtests
- add some verbiage in findConflictByTerm around first index
This commit is contained in:
Tobias Grieger
2021-02-11 13:30:55 +01:00
parent 6828517965
commit c1e8d3a63f
9 changed files with 198 additions and 98 deletions
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2
raft/testdata/campaign_learner_must_vote.txt vendored
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@@ -111,7 +111,7 @@ stabilize 2 3
3->2 MsgAppResp Term:2 Log:1/4 Rejected (Hint: 3)
> 2 receiving messages
3->2 MsgAppResp Term:2 Log:1/4 Rejected (Hint: 3)
DEBUG 2 received MsgAppResp(MsgApp was rejected, hint: 3) from 3 for index 4, log term 1
DEBUG 2 received MsgAppResp(rejected, hint: (index 3, term 1)) from 3 for index 4
DEBUG 2 decreased progress of 3 to [StateProbe match=0 next=4]
> 2 handling Ready
Ready MustSync=false:

2
raft/testdata/confchange_v1_add_single.txt vendored
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@@ -60,7 +60,7 @@ stabilize
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
> 1 receiving messages
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
DEBUG 1 received MsgAppResp(MsgApp was rejected, hint: 0) from 2 for index 3, log term 0
DEBUG 1 received MsgAppResp(rejected, hint: (index 0, term 0)) from 2 for index 3
DEBUG 1 decreased progress of 2 to [StateProbe match=0 next=1]
DEBUG 1 [firstindex: 3, commit: 4] sent snapshot[index: 4, term: 1] to 2 [StateProbe match=0 next=1]
DEBUG 1 paused sending replication messages to 2 [StateSnapshot match=0 next=1 paused pendingSnap=4]

4
raft/testdata/confchange_v2_add_double_auto.txt vendored
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@@ -81,7 +81,7 @@ stabilize 1 2
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
> 1 receiving messages
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
DEBUG 1 received MsgAppResp(MsgApp was rejected, hint: 0) from 2 for index 3, log term 0
DEBUG 1 received MsgAppResp(rejected, hint: (index 0, term 0)) from 2 for index 3
DEBUG 1 decreased progress of 2 to [StateProbe match=0 next=1]
DEBUG 1 [firstindex: 3, commit: 4] sent snapshot[index: 4, term: 1] to 2 [StateProbe match=0 next=1]
DEBUG 1 paused sending replication messages to 2 [StateSnapshot match=0 next=1 paused pendingSnap=4]
@@ -155,7 +155,7 @@ stabilize 1 3
3->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
> 1 receiving messages
3->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
DEBUG 1 received MsgAppResp(MsgApp was rejected, hint: 0) from 3 for index 3, log term 0
DEBUG 1 received MsgAppResp(rejected, hint: (index 0, term 0)) from 3 for index 3
DEBUG 1 decreased progress of 3 to [StateProbe match=0 next=1]
DEBUG 1 [firstindex: 3, commit: 5] sent snapshot[index: 5, term: 1] to 3 [StateProbe match=0 next=1]
DEBUG 1 paused sending replication messages to 3 [StateSnapshot match=0 next=1 paused pendingSnap=5]

2
raft/testdata/confchange_v2_add_double_implicit.txt vendored
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@@ -66,7 +66,7 @@ stabilize 1 2
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
> 1 receiving messages
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
DEBUG 1 received MsgAppResp(MsgApp was rejected, hint: 0) from 2 for index 3, log term 0
DEBUG 1 received MsgAppResp(rejected, hint: (index 0, term 0)) from 2 for index 3
DEBUG 1 decreased progress of 2 to [StateProbe match=0 next=1]
DEBUG 1 [firstindex: 3, commit: 4] sent snapshot[index: 4, term: 1] to 2 [StateProbe match=0 next=1]
DEBUG 1 paused sending replication messages to 2 [StateSnapshot match=0 next=1 paused pendingSnap=4]

2
raft/testdata/confchange_v2_add_single_auto.txt vendored
View File

@@ -61,7 +61,7 @@ stabilize
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
> 1 receiving messages
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
DEBUG 1 received MsgAppResp(MsgApp was rejected, hint: 0) from 2 for index 3, log term 0
DEBUG 1 received MsgAppResp(rejected, hint: (index 0, term 0)) from 2 for index 3
DEBUG 1 decreased progress of 2 to [StateProbe match=0 next=1]
DEBUG 1 [firstindex: 3, commit: 4] sent snapshot[index: 4, term: 1] to 2 [StateProbe match=0 next=1]
DEBUG 1 paused sending replication messages to 2 [StateSnapshot match=0 next=1 paused pendingSnap=4]

2
raft/testdata/confchange_v2_add_single_explicit.txt vendored
View File

@@ -61,7 +61,7 @@ stabilize 1 2
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
> 1 receiving messages
2->1 MsgAppResp Term:1 Log:0/3 Rejected (Hint: 0)
DEBUG 1 received MsgAppResp(MsgApp was rejected, hint: 0) from 2 for index 3, log term 0
DEBUG 1 received MsgAppResp(rejected, hint: (index 0, term 0)) from 2 for index 3
DEBUG 1 decreased progress of 2 to [StateProbe match=0 next=1]
DEBUG 1 [firstindex: 3, commit: 4] sent snapshot[index: 4, term: 1] to 2 [StateProbe match=0 next=1]
DEBUG 1 paused sending replication messages to 2 [StateSnapshot match=0 next=1 paused pendingSnap=4]