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Raft and state store indexes as metrics #5841
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Original file line number | Diff line number | Diff line change |
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@@ -15,6 +15,7 @@ import ( | |
"sync/atomic" | ||
"time" | ||
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"github.com/armon/go-metrics" | ||
"github.com/hashicorp/consul/agent/consul/autopilot" | ||
consulapi "github.com/hashicorp/consul/api" | ||
"github.com/hashicorp/consul/lib" | ||
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@@ -410,6 +411,9 @@ func NewServer(config *Config, consulCatalog consul.CatalogAPI) (*Server, error) | |
// Emit metrics | ||
go s.heartbeatStats() | ||
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// Emit raft and state store metrics | ||
go s.EmitRaftStats(10*time.Second, s.shutdownCh) | ||
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// Start enterprise background workers | ||
s.startEnterpriseBackground() | ||
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@@ -1450,6 +1454,27 @@ func (s *Server) Stats() map[string]map[string]string { | |
return stats | ||
} | ||
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// EmitRaftStats is used to export metrics about raft indexes and state store snapshot index | ||
func (s *Server) EmitRaftStats(period time.Duration, stopCh <-chan struct{}) { | ||
for { | ||
select { | ||
case <-time.After(period): | ||
lastIndex := s.raft.LastIndex() | ||
metrics.SetGauge([]string{"raft", "lastIndex"}, float32(lastIndex)) | ||
appliedIndex := s.raft.AppliedIndex() | ||
metrics.SetGauge([]string{"raft", "appliedIndex"}, float32(appliedIndex)) | ||
stateStoreSnapshotIndex, err := s.State().LatestIndex() | ||
if err != nil { | ||
s.logger.Warn("Unable to read snapshot index from statestore, metric will not be emitted", "error", err) | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Curious - what conditions would result into an error getting the latest index? Also, is it meant to be recoverable? I'd be concerned about spurious logging if it happens somewhat frequently. There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. This should be rare and indicates state store corruption (either the index table is missing or contains invalid data). A lot of Nomad operations would be broken if it gets to that state so its a good thing to be warning about here. |
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} else { | ||
metrics.SetGauge([]string{"state", "snapshotIndex"}, float32(stateStoreSnapshotIndex)) | ||
} | ||
case <-stopCh: | ||
return | ||
} | ||
} | ||
} | ||
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// Region returns the region of the server | ||
func (s *Server) Region() string { | ||
return s.config.Region | ||
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Original file line number | Diff line number | Diff line change |
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@@ -109,6 +109,18 @@ when retrieving metrics using the above described signals. | |
<td>Raft transactions / `interval`</td> | ||
<td>Counter</td> | ||
</tr> | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. @langmartin @schmichael Can i get a review on these docs before I merge? |
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<tr> | ||
<td>`nomad.raft.lastIndex`</td> | ||
<td>Index of the <a href="https://godoc.org/github.com/hashicorp/raft#Raft.LastIndex">last log in stable storage</a></td> | ||
<td>Sequence number</td> | ||
<td>Gauge</td> | ||
</tr> | ||
<tr> | ||
<td>`nomad.raft.appliedIndex`</td> | ||
<td>Index of the <a href="https://godoc.org/github.com/hashicorp/raft#Raft.AppliedIndex">last applied log</a></td> | ||
<td>Sequence number</td> | ||
<td>Gauge</td> | ||
</tr> | ||
<tr> | ||
<td>`nomad.raft.replication.appendEntries`</td> | ||
<td>Raft transaction commit time</td> | ||
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@@ -167,6 +179,12 @@ when retrieving metrics using the above described signals. | |
<td>ms / Plan Evaluation</td> | ||
<td>Timer</td> | ||
</tr> | ||
<tr> | ||
<td>`nomad.state.snapshotIndex`</td> | ||
<td>Latest index in the server's in memory state store</td> | ||
<td>Sequence number</td> | ||
<td>Gauge</td> | ||
</tr> | ||
<tr> | ||
<td>`nomad.worker.invoke_scheduler.<type>`</td> | ||
<td>Time to run the scheduler of the given type</td> | ||
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There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
very nit-picky -
timer.Ticker
is slightly nicer for using in loops, to reuse channels and timer mechanisms.