storage: more aggressively replica GC learner replicas #41300
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tbg
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Oct 4, 2019
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Reviewed 4 of 4 files at r1.
Reviewable status:complete! 1 of 0 LGTMs obtained (waiting on @ajwerner)
pkg/storage/replica_gc_queue.go, line 39 at r1 (raw file):
// A Replica is suspected to have been removed if either it is in the // candidate Raft state (which is a typical sign of having been removed // from the group) or it is a leaner which has been removed but never heard
learner
This PR fixes a test flake in TestSystemZoneConfig:
```
client_replica_test.go:1753: condition failed to evaluate within 45s: mismatch between
r1:/{Min-System/NodeLiveness} [(n1,s1):1, (n6,s6):2, (n4,s4):3, (n2,s2):7, (n7,s7):5, next=8, gen=14]
r1:/{Min-System/NodeLiveness} [(n1,s1):1, (n6,s6):2, (n4,s4):3, (n2,s2):4, (n7,s7):5, (n3,s3):6LEARNER, next=7, gen=9]
```
The above flake happens because we set the expectation in the map to a
descriptor which contains a learner which has since been removed.
We shouldn't use a range descriptor which contains learners as the expectation.
To avoid that we return an error in the succeeds soon if we come across a
descriptor which contains learners. This behavior unvealed another issue,
we are way too conservative with replica GC for learners. Most of the time
when learners are removed they hear about their own removal, but if they don't
we won't consider the Replica for removal for 10 days! This commit changes
the replica gc queue behavior to treat learners line candidates.
Fixes cockroachdb#40980.
Release Justification: bug fixes and low-risk updates to new functionality.
Release note: None
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ajwerner
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Oct 4, 2019
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TFTR!
bors r=tbg
Reviewable status:
pkg/storage/replica_gc_queue.go, line 39 at r1 (raw file):
Previously, tbg (Tobias Grieger) wrote…
learner
Done.
Build failed |
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Flaked on TestComposeGSS. bors r+ |
Build failed |
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bors r+ |
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Oct 4, 2019
41300: storage: more aggressively replica GC learner replicas r=ajwerner a=ajwerner
This PR fixes a test flake in TestSystemZoneConfig:
```
client_replica_test.go:1753: condition failed to evaluate within 45s: mismatch between
r1:/{Min-System/NodeLiveness} [(n1,s1):1, (n6,s6):2, (n4,s4):3, (n2,s2):7, (n7,s7):5, next=8, gen=14]
r1:/{Min-System/NodeLiveness} [(n1,s1):1, (n6,s6):2, (n4,s4):3, (n2,s2):4, (n7,s7):5, (n3,s3):6LEARNER, next=7, gen=9]
```
The above flake happens because we set the expectation in the map to a
descriptor which contains a learner which has since been removed.
We shouldn't use a range descriptor which contains learners as the expectation.
To avoid that we return an error in the succeeds soon if we come across a
descriptor which contains learners. This behavior unvealed another issue,
we are way too conservative with replica GC for learners. Most of the time
when learners are removed they hear about their own removal, but if they don't
we won't consider the Replica for removal for 10 days! This commit changes
the replica gc queue behavior to treat learners line candidates.
Fixes #40980.
Release Justification: bug fixes and low-risk updates to new functionality.
Release note: None
41308: storage: remove error from Replica.applyTimestampCache() r=ajwerner a=ajwerner
Stumbled upon a function with an error in its return signature
that never returns an error. Better to remove it and the stale
comment that goes with it. The removal of the code paths which
could have returned an error occurred in #33396.
Release justification: Low risk, does not change logic. Could also
hold off.
Release note: None
Co-authored-by: Andrew Werner <ajwerner@cockroachlabs.com>
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This PR fixes a test flake in TestSystemZoneConfig:
The above flake happens because we set the expectation in the map to a
descriptor which contains a learner which has since been removed.
We shouldn't use a range descriptor which contains learners as the expectation.
To avoid that we return an error in the succeeds soon if we come across a
descriptor which contains learners. This behavior unvealed another issue,
we are way too conservative with replica GC for learners. Most of the time
when learners are removed they hear about their own removal, but if they don't
we won't consider the Replica for removal for 10 days! This commit changes
the replica gc queue behavior to treat learners line candidates.
Fixes #40980.
Release Justification: bug fixes and low-risk updates to new functionality.
Release note: None