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app/vmstorage: improve error logging when the request times out

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This commit is contained in:
Aliaksandr Valialkin 2020-08-10 13:17:12 +03:00
parent e3999ac010
commit b3d4ff7ee2
3 changed files with 14 additions and 2 deletions
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11
app/vmstorage/transport/server.go
View file

@ -1,6 +1,7 @@
package transport
import (
"errors"
"flag"
"fmt"
"io"
@ -381,6 +382,9 @@ func (s *Server) processVMSelectConn(bc *handshake.BufferedConn) error {
// Remote client gracefully closed the connection.
return nil
}
if errors.Is(err, storage.ErrDeadlineExceeded) {
return fmt.Errorf("cannot process vmselect request in %d seconds: %w", ctx.timeout, err)
}
return fmt.Errorf("cannot process vmselect request: %w", err)
}
if err := bc.Flush(); err != nil {
@ -399,6 +403,9 @@ type vmselectRequestCtx struct {
sr storage.Search
mb storage.MetricBlock
// timeout in seconds for the current request
timeout uint64
// deadline in unix timestamp seconds for the current request.
deadline uint64
}
@ -466,6 +473,9 @@ func (ctx *vmselectRequestCtx) writeDataBufBytes() error {
const maxErrorMessageSize = 64 * 1024
func (ctx *vmselectRequestCtx) writeErrorMessage(err error) error {
if errors.Is(err, storage.ErrDeadlineExceeded) {
err = fmt.Errorf("cannot execute request in %d seconds: %w", ctx.timeout, err)
}
errMsg := err.Error()
if len(errMsg) > maxErrorMessageSize {
// Trim too long error message.
@ -520,6 +530,7 @@ func (s *Server) processVMSelectRequest(ctx *vmselectRequestCtx) error {
if err != nil {
return fmt.Errorf("cannot read timeout for the request %q: %w", rpcName, err)
}
ctx.timeout = uint64(timeout)
ctx.deadline = fasttime.UnixTimestamp() + uint64(timeout)
switch rpcName {

2
lib/storage/search.go
View file

@ -416,7 +416,7 @@ func (sq *SearchQuery) Unmarshal(src []byte) ([]byte, error) {
func checkSearchDeadlineAndPace(deadline uint64) error {
if fasttime.UnixTimestamp() > deadline {
return errDeadlineExceeded
return ErrDeadlineExceeded
}
storagepacelimiter.Search.WaitIfNeeded()
return nil

3
lib/storage/storage.go
View file

@ -957,7 +957,8 @@ func (s *Storage) prefetchMetricNames(tsids []TSID, deadline uint64) error {
return nil
}
var errDeadlineExceeded = fmt.Errorf("deadline exceeded")
// ErrDeadlineExceeded is returned when the request times out.
var ErrDeadlineExceeded = fmt.Errorf("deadline exceeded")
// DeleteMetrics deletes all the metrics matching the given tfss.
//