Hello Kudu Jenkins,
I'd like you to reexamine a change. Please visit
http://gerrit.cloudera.org:8080/24287
to look at the new patch set (#2).
Change subject: KUDU-3762 - Fix catchup deadlock on LMP mismatch
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KUDU-3762 - Fix catchup deadlock on LMP mismatch
A Raft leader could enter an infinite LMP mismatch loop if it erroneously
marked a peer as unrecoverable (wal_catchup_possible = false). In this
state, RequestForPeer() skips log-position negotiation and sends status
updates at the log tip. If the peer is behind, it rejects the request,
triggering an immediate retry loop that consumes CPU and prevents catchup.
This patch fixes the deadlock by probing the LogCache when an LMP mismatch
occurs. If the peer's reported index is found locally, wal_catchup_possible
is reset to true, allowing the leader to resume normal catchup logic.
Testing:
- Added a test case to reproduce the issue
- Verified the fix resolves the loop and allows the new master to become
a voter.
Change-Id: I00f4f840c21cc037a2aa6c023af168352fef0761
---
M src/kudu/consensus/consensus_queue.cc
M src/kudu/mini-cluster/external_mini_cluster-test.cc
2 files changed, 164 insertions(+), 3 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/87/24287/2
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I00f4f840c21cc037a2aa6c023af168352fef0761
Gerrit-Change-Number: 24287
Gerrit-PatchSet: 2
Gerrit-Owner: Abhishek Chennaka <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
