/
s_execution.go
243 lines (236 loc) · 7.83 KB
/
s_execution.go
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package cluster
import (
"context"
"fmt"
"log"
"sync"
"github.com/go-sif/sif"
pb "github.com/go-sif/sif/internal/rpc"
"github.com/go-sif/sif/internal/stats"
itypes "github.com/go-sif/sif/internal/types"
iutil "github.com/go-sif/sif/internal/util"
logging "github.com/go-sif/sif/logging"
"github.com/hashicorp/go-multierror"
)
type executionServer struct {
pb.UnimplementedExecutionServiceServer
planExecutor itypes.PlanExecutor
logClient pb.LogServiceClient
statsTracker *stats.RunStatistics
}
// createExecutionServer creates a new execution server
func createExecutionServer(logClient pb.LogServiceClient, planExecutor itypes.PlanExecutor, statsTracker *stats.RunStatistics) *executionServer {
return &executionServer{logClient: logClient, planExecutor: planExecutor, statsTracker: statsTracker}
}
// RunStage executes a stage on a Worker
func (s *executionServer) RunStage(ctx context.Context, req *pb.MRunStageRequest) (*pb.MRunStageResponse, error) {
if !s.planExecutor.HasNextStage() {
return nil, fmt.Errorf("plan Executor %s does not have a next stage to run (stage %d expected)", s.planExecutor.ID(), req.StageId)
}
onRowErrorWithContext := func(err error) error {
return s.onRowError(ctx, err)
}
stage := s.planExecutor.GetNextStage()
if stage.ID() != int(req.StageId) {
return nil, fmt.Errorf("next stage on worker (%d) does not match expected (%d)", stage.ID(), req.StageId)
}
// create a stage context
sctx := createStageContext(ctx, stage)
// populate stage context with info from request
if req.Buckets != nil {
sctx.SetShuffleBuckets(req.Buckets)
}
// initialize stage context in planExecutor to set up other important stuff like partition caches
err := s.planExecutor.InitStageContext(sctx, stage)
if err != nil {
return nil, err
}
// execute stage
log.Println("------------------------------")
log.Printf("Running stage %d...", req.StageId)
defer func() {
log.Printf("Finished running stage %d", req.StageId)
log.Println("------------------------------")
}()
s.statsTracker.StartStage()
s.statsTracker.StartTransform()
log.Printf("Mapping partitions in stage %d...", req.StageId)
err = s.planExecutor.TransformPartitions(sctx, stage.WorkerExecute, onRowErrorWithContext)
if err != nil {
if _, ok := err.(*multierror.Error); !s.planExecutor.GetConf().IgnoreRowErrors || !ok {
// either this isn't a multierr or we're supposed to fail immediately
s.statsTracker.EndTransform(stage.ID())
log.Printf("Failed to map in stage %d: %e", req.StageId, err)
return nil, err
}
}
log.Printf("Finished mapping partitions in stage %d", req.StageId)
s.statsTracker.EndTransform(stage.ID())
if req.RunShuffle {
log.Printf("Shuffling partitions in stage %d...", req.StageId)
s.statsTracker.StartShuffle()
err = s.runShuffle(sctx, req)
if err != nil {
s.statsTracker.EndShuffle(stage.ID())
log.Printf("Failed to shuffle in stage %d: %e", req.StageId, err)
return nil, err
}
log.Printf("Finished shuffling partitions in stage %d", req.StageId)
s.statsTracker.EndShuffle(stage.ID())
}
s.statsTracker.EndStage(stage.ID())
return &pb.MRunStageResponse{}, nil
}
func (s *executionServer) onRowError(ctx context.Context, err error) (outgoingErr error) {
defer func() {
if r := recover(); r != nil {
if anErr, ok := r.(error); ok {
outgoingErr = anErr
} else {
outgoingErr = fmt.Errorf("panic was not an error")
}
}
}()
// if this is a multierror, it's from a row transformation, which we might want to ignore
if multierr, ok := err.(*multierror.Error); s.planExecutor.GetConf().IgnoreRowErrors && ok {
multierr.ErrorFormat = iutil.FormatMultiError
// log errors and carry on
logger, err := s.logClient.Log(ctx)
if err != nil {
return err
}
err = logger.Send(&pb.MLogMsg{
Level: logging.ErrorLevel,
Source: s.planExecutor.ID(),
Message: fmt.Sprintf("Map error in stage %d:\n%s", s.planExecutor.GetCurrentStage().ID(), multierr.Error()),
})
if err != nil {
return err
}
_, err = logger.CloseAndRecv()
if err != nil {
return err
}
} else {
// otherwise, crash immediately
return err
}
return nil
}
// runShuffle executes a prepared shuffle on a Worker
func (s *executionServer) runShuffle(sctx sif.StageContext, req *pb.MRunStageRequest) (err error) {
// build list of workers to communicate with
buckets := make([]uint64, 0)
targets := make([]pb.PartitionsServiceClient, 0)
for i := 0; i < len(req.Buckets); i++ {
if req.Buckets[i] != req.AssignedBucket {
conn, err := dialWorker(req.Workers[i])
partitionClient := pb.NewPartitionsServiceClient(conn)
if err != nil {
return err
}
targets = append(targets, partitionClient)
buckets = append(buckets, req.Buckets[i])
defer conn.Close()
}
}
// assign bucket to self
s.planExecutor.AssignShuffleBucket(req.AssignedBucket)
// start partition merger, which merges partitions into our tree sequentially
var fetchWg, mergeWg sync.WaitGroup
asyncFetchErrors := make(chan error, len(buckets)) // each fetch goroutine can send one error before terminating
asyncMergeErrors := make(chan error, 1) // the merge goroutine can only send one error before terminating
partChan := make(chan sif.ReduceablePartition, len(buckets))
// setup our cleanup in the correct order (read in reverse)
defer close(asyncMergeErrors)
// check for remaining merge errors
defer func() {
select {
case mergeErr := <-asyncMergeErrors:
if s.onRowError(sctx, mergeErr) != nil {
err = mergeErr
}
default:
}
}()
defer close(asyncFetchErrors) // finally, close error channels
// check for remaining fetch errors
defer func() {
select {
case fetchErr := <-asyncFetchErrors:
if s.onRowError(sctx, fetchErr) != nil {
err = fetchErr
}
default:
}
}()
defer mergeWg.Wait() // then, wait for any outstanding merges to finish
defer close(partChan) // then, close the partition channel
defer fetchWg.Wait() // first, wait for all fetches to finish
mergeWg.Add(1)
// start shuffled partition merging routine to consume from partChan
go s.planExecutor.MergeShuffledPartitions(sctx, &mergeWg, partChan, asyncMergeErrors)
// round-robin request partitions
t := 0
concurrentFetchLimit := 4
activeFetches := 0
for {
if len(targets) == 0 {
break
}
shuffleReq := &pb.MShufflePartitionRequest{Bucket: req.AssignedBucket}
res, err := targets[t].ShufflePartition(sctx, shuffleReq)
if err != nil {
return err
} else if !res.Ready {
continue // TODO maybe skip worker for a while?
} else if res.Part != nil {
transferReq := &pb.MTransferPartitionDataRequest{Id: res.Part.Id}
// initiate request to shuffle partition data
stream, err := targets[t].TransferPartitionData(sctx, transferReq)
if err != nil {
return err
}
// split off goroutine to actually transfer the data
fetchWg.Add(1)
activeFetches++
go s.planExecutor.ShufflePartitionData(&fetchWg, partChan, asyncFetchErrors, res.Part, stream)
}
// if the target worker has no more partitions, take it out of the rotation
if !res.HasNext {
// remove target from rotation
copy(buckets[t:], buckets[t+1:])
buckets = buckets[:len(buckets)-1]
copy(targets[t:], targets[t+1:])
targets[len(targets)-1] = nil // for garbage collection
targets = targets[:len(targets)-1]
}
// block every time we've fetched one partition from each target,
// so we don't create too many goroutines for ShufflePartitionData
if activeFetches >= concurrentFetchLimit {
fetchWg.Wait()
// reset counter
activeFetches = 0
// check fetch errors
select {
case fetchErr := <-asyncFetchErrors:
if err := s.onRowError(sctx, fetchErr); err != nil {
return err
}
default:
}
// check merge errors
select {
case mergeErr := <-asyncMergeErrors:
if mergeErr != nil {
return mergeErr
}
default:
}
}
if len(targets) > 0 {
t = (t + 1) % len(targets)
}
}
return nil
}