java - 有没有更快的方法来初始化 BigQuery 客户端？

Question

使用谷歌文档推荐的方式初始化 BigQuery 客户端 Quickstart: Using Client Libraries需要 15 秒才能完成。这看起来很慢 - 有没有更快的方法？

import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryOptions;

public class Test {

  public static void main(String... args) throws Exception {

    long nanotime = System.nanoTime();
    BigQueryOptions x = BigQueryOptions.getDefaultInstance();
    System.out.println("getDefaultInstance " +
                                  (System.nanoTime()-nanotime));
    nanotime = System.nanoTime();
    BigQuery bigquery = x.getService();
    System.out.println("getService " + (System.nanoTime()-nanotime));
  }
}

输出:

getDefaultInstance 15453574055
getService 34049521
------------------------------------------------------------------------
BUILD SUCCESS
------------------------------------------------------------------------
Total time: 16.021s
Finished at: Tue Mar 19 14:23:54 GMT 2019
Final Memory: 7M/178M
------------------------------------------------------------------------

Answer 1

这很奇怪。我可以在自己这边运行相同的代码，并且初始化所需的时间不到 200ms。我在 n1-standard-4 VM 中运行代码并使用以下 java 版本:

openjdk version "1.8.0_181"
OpenJDK Runtime Environment (build 1.8.0_181-8u181-b13-2~deb9u1-b13)
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)

和 BigQuery 客户端的 1.62 版本:

<dependency>
      <groupId>com.google.cloud</groupId>
      <artifactId>google-cloud-bigquery</artifactId>
      <version>1.62.0</version>
</dependency>