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boot.go
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boot.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// boot is the boot code for the Java SDK harness container. It is responsible
// for retrieving staged files and invoking the JVM correctly.
package main
import (
"context"
"flag"
"log"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/apache/beam/sdks/go/pkg/beam/artifact"
fnpb "github.com/apache/beam/sdks/go/pkg/beam/model/fnexecution_v1"
pb "github.com/apache/beam/sdks/go/pkg/beam/model/pipeline_v1"
"github.com/apache/beam/sdks/go/pkg/beam/provision"
"github.com/apache/beam/sdks/go/pkg/beam/util/execx"
"github.com/apache/beam/sdks/go/pkg/beam/util/grpcx"
"github.com/apache/beam/sdks/go/pkg/beam/util/syscallx"
"github.com/golang/protobuf/proto"
)
var (
// Contract: https://s.apache.org/beam-fn-api-container-contract.
id = flag.String("id", "", "Local identifier (required).")
loggingEndpoint = flag.String("logging_endpoint", "", "Logging endpoint (required).")
artifactEndpoint = flag.String("artifact_endpoint", "", "Artifact endpoint (required).")
provisionEndpoint = flag.String("provision_endpoint", "", "Provision endpoint (required).")
controlEndpoint = flag.String("control_endpoint", "", "Control endpoint (required).")
semiPersistDir = flag.String("semi_persist_dir", "/tmp", "Local semi-persistent directory (optional).")
)
func main() {
flag.Parse()
if *id == "" {
log.Fatal("No id provided.")
}
if *loggingEndpoint == "" {
log.Fatal("No logging endpoint provided.")
}
if *artifactEndpoint == "" {
log.Fatal("No artifact endpoint provided.")
}
if *provisionEndpoint == "" {
log.Fatal("No provision endpoint provided.")
}
if *controlEndpoint == "" {
log.Fatal("No control endpoint provided.")
}
log.Printf("Initializing java harness: %v", strings.Join(os.Args, " "))
ctx := grpcx.WriteWorkerID(context.Background(), *id)
// (1) Obtain the pipeline options
info, err := provision.Info(ctx, *provisionEndpoint)
if err != nil {
log.Fatalf("Failed to obtain provisioning information: %v", err)
}
options, err := provision.ProtoToJSON(info.GetPipelineOptions())
if err != nil {
log.Fatalf("Failed to convert pipeline options: %v", err)
}
// (2) Retrieve the staged user jars. We ignore any disk limit,
// because the staged jars are mandatory.
dir := filepath.Join(*semiPersistDir, "staged")
artifacts, err := artifact.Materialize(ctx, *artifactEndpoint, info.GetRetrievalToken(), dir)
if err != nil {
log.Fatalf("Failed to retrieve staged files: %v", err)
}
// (3) Invoke the Java harness, preserving artifact ordering in classpath.
os.Setenv("HARNESS_ID", *id)
os.Setenv("PIPELINE_OPTIONS", options)
os.Setenv("LOGGING_API_SERVICE_DESCRIPTOR", proto.MarshalTextString(&pb.ApiServiceDescriptor{Url: *loggingEndpoint}))
os.Setenv("CONTROL_API_SERVICE_DESCRIPTOR", proto.MarshalTextString(&pb.ApiServiceDescriptor{Url: *controlEndpoint}))
const jarsDir = "/opt/apache/beam/jars"
cp := []string{
filepath.Join(jarsDir, "slf4j-api.jar"),
filepath.Join(jarsDir, "slf4j-jdk14.jar"),
filepath.Join(jarsDir, "beam-sdks-java-harness.jar"),
}
for _, md := range artifacts {
cp = append(cp, filepath.Join(dir, filepath.FromSlash(md.Name)))
}
args := []string{
"-Xmx" + strconv.FormatUint(heapSizeLimit(info), 10),
"-XX:-OmitStackTraceInFastThrow",
"-cp", strings.Join(cp, ":"),
"org.apache.beam.fn.harness.FnHarness",
}
log.Printf("Executing: java %v", strings.Join(args, " "))
log.Fatalf("Java exited: %v", execx.Execute("java", args...))
}
// heapSizeLimit returns 80% of the runner limit, if provided. If not provided,
// it returns 70% of the physical memory on the machine. If it cannot determine
// that value, it returns 1GB. This is an imperfect heuristic. It aims to
// ensure there is memory for non-heap use and other overhead, while also not
// underutilizing the machine.
func heapSizeLimit(info *fnpb.ProvisionInfo) uint64 {
if provided := info.GetResourceLimits().GetMemory().GetSize(); provided > 0 {
return (provided * 80) / 100
}
if size, err := syscallx.PhysicalMemorySize(); err == nil {
return (size * 70) / 100
}
return 1 << 30
}