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CLUSTER NODES output was parsed in six places, each splitting lines with strings.Fields and indexing by position. They agreed on the len(fields) < 8 guard and the flag split at fields[2], then diverged, and three of them re-stated the line layout in a comment. Add a ClusterNode struct with named fields and ParseClusterNodes as the only code that reads field positions. GetSlots, IsNodeFailed, PrimaryIdFromSelf, FindStaleAddressPeers, GetFailingNodes and the flag extraction in getNodeState now read fields instead of indices. Owned slot ranges and in-flight migration markers are kept in separate fields. Conflating them is the ambiguity that motivated this: a primary holding only a marker owns no assignable range but is already in the slot map, so a test for "owns no slots" misclassifies it as pending. HasSlotAssignment answers that question; GetSlots answers the narrower one of which ranges are owned. One behaviour change: GetSlots returns []SlotsRange instead of the raw []string slot fields, so callers no longer convert. The pending check in GetClusterState uses HasSlotAssignment to keep a marker-only primary out of PendingNodes. Fields are limited to what callers read: one ClusterNode is held per known node per scraped node, so port, config epoch and link state from the issue's field list are left out. They are one-liners to add when something needs them. Signed-off-by: Björn Svensson <bjorn.a.svensson@est.tech>
NodeState held the raw CLUSTER NODES output and every accessor re-parsed it. IsNodeFailed and FindStaleAddressPeers do so inside nested loops over each node, so a single reconcile parsed the same output repeatedly and the cost grew with cluster size. Replace the raw string with the parsed table, produced once by the scrape. Myself, IsNodeFailed, FindStaleAddressPeers and GetFailingNodes read it directly. The field is unexported, so the raw output is no longer retained per node. Removing the string forces a fix in rebalanceSlots and drainExcessShards. Both tested "has gossip introduced the destination yet" with strings.Contains over the raw output looking for the destination ID, which also matches an ID that appears only as another entry's primary field or as a migration marker peer ([5461->-<id>]) and so has no entry of its own. They now use NodeState.KnowsNode, which matches on entry ID. Signed-off-by: Björn Svensson <bjorn.a.svensson@est.tech>
GetFailingNodes built NodeState values with only Id and Address set. Those are peer-table rows, not scraped nodes: they have no client, no INFO and no shard id, so the type promised more than the values carried. Return the parsed entries directly. The caller in forgetStaleNodes only reads the ID and the address, which ClusterNode already carries as Id and Host. Signed-off-by: Björn Svensson <bjorn.a.svensson@est.tech>
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe PR adds structured parsing for ChangesCluster state parsing refactor
Merge Risk: ⚪ Minimal · up to The refactor centralizes CLUSTER NODES parsing without a supplied concrete behavior or production-impact regression, so it is mergeable with normal checks. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
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Full details: Linked Issues checkExplanation The PR centralizes parsing, preserves slot and migration-marker separation, updates callers, and adds relevant tests. However, issue Resolution Update parseClusterNodesRole to use ParseClusterNodes and ClusterNode instead of positional parsing. Add the required ClusterNode fields from issue Full details: Docstring CoverageExplanation Docstring coverage is 47.83% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 23 functions across 5 files. (1 skipped: 1 unsupported.)
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Inline comments:
In `@docs/clusterstate-design.md`:
- Line 47: Update the fenced code block containing the ClusterState structural
diagram to specify the text language identifier, resolving the Markdownlint
MD040 warning while preserving the diagram content.
In `@internal/controller/valkeycluster_controller.go`:
- Line 1410: Update the address-matching predicate in GetFailingNodes so it only
compares Status.PodIP with failing.Host when failing.Host is non-empty. Preserve
the existing live-ID and failure checks for noaddr entries, ensuring unrelated
ValkeyNode objects with empty PodIP do not match.
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docs/clusterstate-design.mdinternal/controller/valkeycluster_controller.gointernal/valkey/clusternode.gointernal/valkey/clusternode_test.gointernal/valkey/clusterstate.gointernal/valkey/clusterstate_test.go
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bjosv
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Signed-off-by: Björn Svensson <bjorn.a.svensson@est.tech>
melancholictheory
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Checked the behaviour-preservation claim on the part most likely to break quietly. IsNodeFailed already matched fail and fail? before this PR, so ClusterNode.IsFailing covering both is a rename, not a change. make test is green on 2b67520, and coverage on internal/valkey goes from 61.4% to 69.1%.
The unification does pass over two sites, and both of them read flags from the one place that cannot hold the answer:
GetSyncedReplicas(internal/valkey/clusterstate.go:237)countReadyShards(internal/controller/valkeycluster_controller.go:1531)
Both spell it slices.Contains(node.Flags, "fail") || slices.Contains(node.Flags, "pfail"), and each half fails for its own reason.
pfail is not a token Valkey emits. clusterNodeFlagsTable in cluster_legacy.c holds myself, master, slave, fail?, fail, handshake, noaddr, nofailover, and fail? is what CLUSTER_NODE_PFAIL renders as. That clause is always false.
The fail clause is unreachable for a different reason, one this PR makes easier to see at clusterstate.go:576: node.Flags = myself.Flags. Those are the flags on the node's own line, and a node does not flag itself failing. clusterCron skips it when marking PFAIL:
if (node->flags & (CLUSTER_NODE_MYSELF | CLUSTER_NODE_NOADDR | CLUSTER_NODE_HANDSHAKE)) continue;Ran the PR's own parser over a table where a peer is down, rather than trusting the reading:
NodeState.Flags = [myself master]
contains "fail" = false
contains "pfail" = false
per-entry flags and IsFailing:
a1 flags=[myself master] IsFailing=false
b2 flags=[master fail?] IsFailing=true
c3 flags=[slave] IsFailing=false
The answer is in the table this PR builds, and IsFailing reports it correctly. The two callers just never ask.
As for what it costs, an unreachable node never reaches shard.Nodes at all: getNodeState returns nil and the caller gates on that, so len(shard.Nodes) < requiredNodes catches the ordinary outage. The gap is the node the operator can still reach while its peers cannot. countReadyShards counts that shard ready, and if the partitioned node is the primary then IsReplicationInSync returns true unconditionally for primaries, so nothing downstream stops it either. In GetSyncedReplicas the following master_link_status != "up" check covers most of the same ground.
state.IsNodeFailed(node.Id) is already the right call for countReadyShards, which has state in hand. GetSyncedReplicas hangs off ShardState with no route to the full state, so that one is less mechanical.
Changing behaviour may well belong outside a refactor, and leaving both checks alone is defensible. The comment above GetSyncedReplicas saying "Nodes with fail/pfail flags are excluded" is harder to leave, since that is the sentence the next reader will believe. Same two sites as #256.
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@melancholictheory nice finding, I created issue #441 so we can address this pre-existing issue in another PR |
2 participants
This PR closes #406.
Summary
CLUSTER NODESoutput was parsed in six places, each doing its ownstrings.Fields(line)and indexing by position. They agreed on thelen(fields) < 8guard and the flag split atfields[2], then diverged, and three of them restated the line layout in a comment.Three commits, each reviewable on its own:
refactor: parse CLUSTER NODES into a ClusterNode structaddsClusterNodewith named fields andParseClusterNodesas the only code that reads field positions.GetSlots,IsNodeFailed,PrimaryIdFromSelf,FindStaleAddressPeers,GetFailingNodesand the flag extraction ingetNodeStatenow read fields instead of indices.refactor: parse CLUSTER NODES once per scrapereplaces the rawClusterNodesstring onNodeStatewith the parsed table, produced once by the scrape. Every accessor previously re-parsed it, andIsNodeFailedandFindStaleAddressPeersdo so inside nested loops over each node.refactor: return ClusterNode from GetFailingNodesstops fabricatingNodeStatevalues with only two fields set.Features / Behaviour Changes
NodeState.ClusterNodes(raw string) is gone, replaced by the parsed table.The output is parsed once by the scrape instead of on every accessor call, and the raw string is no longer retained per node.
No change to what the operator does to a cluster: the pending-node classification, failure detection and stale-address healing all behave as before, and are covered by tests.
Implementation
Design notes are in
docs/clusterstate-design.md.Limitations
The issue lists a seventh site,
parseClusterNodesRoleininternal/controller/valkeynode_controller.go#320.Checklist
Before submitting the PR make sure the following are checked:
pre-commit run --all-filesor hooks on commit)