github.com/apache/beam/sdks/v2@v2.48.2/java/expansion-service/container/boot.go (about)

     1  // Licensed to the Apache Software Foundation (ASF) under one or more
     2  // contributor license agreements.  See the NOTICE file distributed with
     3  // this work for additional information regarding copyright ownership.
     4  // The ASF licenses this file to You under the Apache License, Version 2.0
     5  // (the "License"); you may not use this file except in compliance with
     6  // the License.  You may obtain a copy of the License at
     7  //
     8  //    http://www.apache.org/licenses/LICENSE-2.0
     9  //
    10  // Unless required by applicable law or agreed to in writing, software
    11  // distributed under the License is distributed on an "AS IS" BASIS,
    12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  // See the License for the specific language governing permissions and
    14  // limitations under the License.
    15  
    16  // Boot code for the Java SDK expansion service.
    17  // Contract:
    18  //   https://github.com/apache/beam/blob/master/model/job-management/src/main/proto/org/apache/beam/model/job_management/v1/beam_expansion_api.proto
    19  //   https://github.com/apache/beam/blob/master/model/job-management/src/main/proto/org/apache/beam/model/job_management/v1/beam_artifact_api.proto
    20  package main
    21  
    22  import (
    23  	// 	"context"
    24  	"flag"
    25  	"fmt"
    26  	"io/ioutil"
    27  	"log"
    28  	"os"
    29  	"path/filepath"
    30  	"strconv"
    31  	"strings"
    32  
    33  	"github.com/apache/beam/sdks/v2/go/pkg/beam/util/execx"
    34  )
    35  
    36  // Args:
    37  //   - Expansion service port
    38  //   - Dependencies (for loading SchemaTransforms)
    39  //   - Config file path. Config file contains:
    40  //     - Allow-list
    41  //     - Per-transform dependencies config.
    42  var (
    43  	id               = flag.String("id", "", "Local identifier (required)")
    44  	port             = flag.Int("port", 0, "Port for the expansion service (required)")
    45  	dependencies_dir = flag.String("dependencies_dir", "", "A directory containing the set of jar files to load transforms from (required)")
    46  	config_file      = flag.String("config_file", "", "Expansion service config YAML file. (required)")
    47  )
    48  
    49  const entrypoint = "org.apache.beam.sdk.expansion.service.ExpansionService"
    50  
    51  func main() {
    52  	flag.Parse()
    53  
    54  	if *id == "" {
    55  		log.Fatalf("The flag 'id' was not specified")
    56  	}
    57  	if *port == 0 {
    58  		log.Fatalf("The flag 'port' was not specified")
    59  	}
    60  	if *dependencies_dir == "" {
    61  		log.Fatalf("The flag 'dependencies_dir' was not specified")
    62  	}
    63  	if *config_file == "" {
    64  		log.Fatalf("The flag 'config_file' was not specified")
    65  	}
    66  
    67  	log.Printf("Starting the Java expansion service container %v.", *id)
    68  
    69  	// Determine all jar files from the dipendencies_dir to be used for the CLASSPATH.
    70  	files, _ := ioutil.ReadDir(*dependencies_dir)
    71  	cp := []string{}
    72  	path, _ := os.Getwd()
    73  	for _, file := range files {
    74  		cp = append(cp, filepath.Join(path, *dependencies_dir, file.Name()))
    75  	}
    76  
    77  	args := []string{
    78  		// Seting max RAM percentage to a high value since we are running a single JVM within the container.
    79  		"-XX:MaxRAMPercentage=80.0",
    80  		// Keep following JVM options in sync with other Java containers released with Beam.
    81  		"-XX:+UseParallelGC",
    82  		"-XX:+AlwaysActAsServerClassMachine",
    83  		"-XX:-OmitStackTraceInFastThrow",
    84  		"-cp", strings.Join(cp, ":"),
    85  	}
    86  
    87  	args = append(args, entrypoint)
    88  	args = append(args, strconv.Itoa(*port))
    89  
    90  	if *config_file != "" {
    91  		args = append(args, fmt.Sprintf("--expansionServiceConfigFile=%s", *config_file))
    92  	}
    93  
    94  	log.Printf("Executing: java %v", strings.Join(args, " "))
    95  	log.Fatalf("Java exited: %v", execx.Execute("java", args...))
    96  }