{"record":{"id":"4530b8a07c6ac05e","repo":"nats-io/nats-server","slug":"appendentry-failed-to-be-placed-on-internal-channe","errorCode":null,"errorMessage":"AppendEntry failed to be placed on internal channel: corrupt entry","messagePattern":"AppendEntry failed to be placed on internal channel: corrupt entry","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/raft.go","lineNumber":4245,"sourceCode":"\t\t\t// Because of drain() it is possible that we get nil from popOne().\n\t\t\tif voteReq, ok := n.reqs.popOne(); ok {\n\t\t\t\tn.processVoteRequest(voteReq)\n\t\t\t}\n\t\t}\n\t}\n}\n\n// handleAppendEntry handles an append entry from the wire. This function\n// is an internal callback from the \"asubj\" append entry subscription.\nfunc (n *raft) handleAppendEntry(sub *subscription, c *client, _ *Account, _, reply string, msg []byte) {\n\tmsg = copyBytes(msg)\n\tif ae, err := decodeAppendEntry(msg, sub, reply); err == nil {\n\t\t// Push to the new entry channel. From here one of the worker\n\t\t// goroutines (runAsLeader, runAsFollower, runAsCandidate) will\n\t\t// pick it up.\n\t\tn.entry.push(ae)\n\t} else {\n\t\tn.warn(\"AppendEntry failed to be placed on internal channel: corrupt entry\")\n\t}\n}\n\n// cancelCatchup will stop an in-flight catchup by unsubscribing from the\n// catchup subscription.\n// Lock should be held.\nfunc (n *raft) cancelCatchup() {\n\tn.debug(\"Canceling catchup subscription since we are now up to date\")\n\n\tif n.catchup != nil && n.catchup.sub != nil {\n\t\tn.unsubscribe(n.catchup.sub)\n\t}\n\tn.cancelCatchupSignal()\n\tn.catchup = nil\n}\n\n// catchupStalled will try to determine if we are stalled. This is called\n// on a new entry from our leader.","sourceCodeStart":4227,"sourceCodeEnd":4263,"githubUrl":"https://github.com/nats-io/nats-server/blob/3a66a489d262bf89b71a71c955c94920394532f3/server/raft.go#L4227-L4263","documentation":"handleAppendEntry's decodeAppendEntry failed to decode the wire message into a valid append entry (truncated or malformed payload), so the entry is not placed on the internal entry channel. The replication message is dropped; correctness is preserved because the leader retries unacknowledged entries.","triggerScenarios":"Thrown at server/raft.go:4245 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Check for cluster version mismatches changing the wire format","Look for message corruption on the internal transport (MTU/network issues)","Leader heartbeats/retries will recover; investigate if a follower persistently fails"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"3a66a489d262bf89b71a71c955c94920394532f3","analyzedAt":"2026-09-02T04:41:54.247Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}