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Fix: changing membership should not remove replication to all learners
When changing membership, replications to the learners(non-voters) that are not added as voter should be kept. E.g.: with a cluster of voters `{0}` and learners `{1, 2, 3}`, changing membership to `{0, 1, 2}` should not remove replication to node `3`. Only replications to removed members should be removed.
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61 changes: 61 additions & 0 deletions
61
openraft/tests/membership/t21_change_membership_keep_learner.rs
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Original file line number | Diff line number | Diff line change |
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use std::sync::Arc; | ||
use std::time::Duration; | ||
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use maplit::btreeset; | ||
use openraft::Config; | ||
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use crate::fixtures::RaftRouter; | ||
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/// Given a cluster of voter {0,1,2} and learners {3,4,5}; | ||
/// Changing membership to {0,3,4} should not remove replication to node-5, should only remove replication to {1,2} | ||
#[tokio::test(flavor = "multi_thread", worker_threads = 4)] | ||
async fn change_membership_keep_learners() -> anyhow::Result<()> { | ||
let (_log_guard, ut_span) = init_ut!(); | ||
let _ent = ut_span.enter(); | ||
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let lag_threshold = 1; | ||
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let config = Arc::new( | ||
Config { | ||
replication_lag_threshold: lag_threshold, | ||
..Default::default() | ||
} | ||
.validate()?, | ||
); | ||
let router = Arc::new(RaftRouter::new(config.clone())); | ||
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let mut log_index = router.new_nodes_from_single(btreeset! {0,1,2}, btreeset! {3,4,5}).await?; | ||
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tracing::info!("--- change membership to: 0,3,4"); | ||
router.change_membership(0, btreeset! {0,3,4}).await?; | ||
log_index += 2; | ||
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tracing::info!("--- write 5 logs"); | ||
{ | ||
router.client_request_many(0, "foo", 5).await; | ||
log_index += 5; | ||
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for id in [1, 2] { | ||
assert!(router | ||
.wait(&id, timeout()) | ||
.await? | ||
.log(Some(log_index), "removed voters can not receive logs") | ||
.await | ||
.is_err()); | ||
} | ||
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for id in [0, 3, 4, 5] { | ||
router | ||
.wait(&id, timeout()) | ||
.await? | ||
.log(Some(log_index), "other voters and learners receive all logs") | ||
.await?; | ||
} | ||
} | ||
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Ok(()) | ||
} | ||
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fn timeout() -> Option<Duration> { | ||
Some(Duration::from_millis(500)) | ||
} |