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[vtadmin] vtexplain lock #7724

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merged 3 commits into from
Mar 23, 2021
Merged

[vtadmin] vtexplain lock #7724

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7a6e956
Synchronize concurrent calls to vtexplain
ajm188 Mar 21, 2021
264d7fe
Clean up after each vtexplain invocation
ajm188 Mar 21, 2021
6e3fb9a
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ajm188 Mar 21, 2021
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16 changes: 16 additions & 0 deletions go/vt/vtadmin/api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@ import (
"net/http"
"strings"
"sync"
"time"

"github.com/gorilla/handlers"
"github.com/gorilla/mux"
Expand Down Expand Up @@ -55,6 +56,9 @@ type API struct {
clusterMap map[string]*cluster.Cluster
serv *grpcserver.Server
router *mux.Router

// See https://github.com/vitessio/vitess/issues/7723 for why this exists.
vtexplainLock sync.Mutex
}

// NewAPI returns a new API, configured to service the given set of clusters,
Expand Down Expand Up @@ -996,10 +1000,22 @@ func (api *API) VTExplain(ctx context.Context, req *vtadminpb.VTExplainRequest)

opts := &vtexplain.Options{ReplicationMode: "ROW"}

lockWaitStart := time.Now()

api.vtexplainLock.Lock()
defer api.vtexplainLock.Unlock()

lockWaitTime := time.Since(lockWaitStart)
log.Infof("vtexplain lock wait time: %s", lockWaitTime)

span.Annotate("vtexplain_lock_wait_time", lockWaitTime.String())

if err := vtexplain.Init(srvVSchema, schema, shardMap, opts); err != nil {
return nil, fmt.Errorf("error initilaizing vtexplain: %w", err)
}

defer vtexplain.Stop()

plans, err := vtexplain.Run(req.Sql)
if err != nil {
return nil, fmt.Errorf("error running vtexplain: %w", err)
Expand Down