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receive: Optimized receive; fixed long term overallocation #3334

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1 change: 1 addition & 0 deletions go.mod
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ require (
github.com/armon/go-metrics v0.3.3
github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b
github.com/cespare/xxhash v1.1.0
github.com/cespare/xxhash/v2 v2.1.1
github.com/chromedp/cdproto v0.0.0-20200424080200-0de008e41fa0
github.com/chromedp/chromedp v0.5.3
github.com/cortexproject/cortex v1.3.1-0.20200923145333-8587ea61fe17
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24 changes: 17 additions & 7 deletions pkg/receive/handler.go
Original file line number Diff line number Diff line change
Expand Up @@ -4,10 +4,11 @@
package receive

import (
"bytes"
"context"
"crypto/tls"
"fmt"
"io/ioutil"
"io"
stdlog "log"
"net"
"net/http"
Expand Down Expand Up @@ -282,13 +283,17 @@ func (h *Handler) receiveHTTP(w http.ResponseWriter, r *http.Request) {
span, ctx := tracing.StartSpan(r.Context(), "receive_http")
defer span.Finish()

compressed, err := ioutil.ReadAll(r.Body)
compressed := &bytes.Buffer{}
if r.ContentLength >= 0 {
compressed.Grow(int(r.ContentLength))
}
_, err := io.Copy(compressed, r.Body)
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@yeya24 yeya24 Oct 17, 2020

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I am curious how much does it optimize? It is not very clear compared to a simple one line ioutil.Readall

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I will comment (:

if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}

reqBuf, err := snappy.Decode(nil, compressed)
reqBuf, err := snappy.Decode(nil, compressed.Bytes())
if err != nil {
level.Error(h.logger).Log("msg", "snappy decode error", "err", err)
http.Error(w, err.Error(), http.StatusBadRequest)
Expand All @@ -314,6 +319,10 @@ func (h *Handler) receiveHTTP(w http.ResponseWriter, r *http.Request) {
if len(tenant) == 0 {
tenant = h.options.DefaultTenantID
}
if len(tenant) == 0 {
http.Error(w, "no tenant ID supplied", http.StatusBadRequest)
return
}
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What's the difference between this if and line 319?


err = h.handleRequest(ctx, rep, tenant, &wreq)
switch err {
Expand Down Expand Up @@ -401,9 +410,10 @@ func (h *Handler) fanoutForward(pctx context.Context, tenant string, replicas ma
}
}()

logger := log.With(h.logger, "tenant", tenant)
// Avoid log.With extra allocations for rare log lines.
logTags := []interface{}{"tenant", tenant}
if id, ok := middleware.RequestIDFromContext(pctx); ok {
logger = log.With(logger, "request-id", id)
logTags = append(logTags, "request-id", id)
}

ec := make(chan error)
Expand Down Expand Up @@ -524,7 +534,7 @@ func (h *Handler) fanoutForward(pctx context.Context, tenant string, replicas ma
b.attempt++
dur := h.expBackoff.ForAttempt(b.attempt)
b.nextAllowed = time.Now().Add(dur)
level.Debug(h.logger).Log("msg", "target unavailable backing off", "for", dur)
level.Debug(h.logger).Log(append(logTags, "msg", "msg", "target unavailable backing off", "for", dur)...)
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Suggested change
level.Debug(h.logger).Log(append(logTags, "msg", "msg", "target unavailable backing off", "for", dur)...)
level.Debug(h.logger).Log(append(logTags, "msg", "target unavailable backing off", "for", dur)...)

} else {
h.peerStates[endpoint] = &retryState{nextAllowed: time.Now().Add(h.expBackoff.ForAttempt(0))}
}
Expand Down Expand Up @@ -553,7 +563,7 @@ func (h *Handler) fanoutForward(pctx context.Context, tenant string, replicas ma
go func() {
for err := range ec {
if err != nil {
level.Debug(logger).Log("msg", "request failed, but not needed to achieve quorum", "err", err)
level.Debug(h.logger).Log(append(logTags, "msg", "request failed, but not needed to achieve quorum", "err", err)...)
}
}
}()
Expand Down
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