google-cloud-dataproc - GCP Dataproc spark.jar.packages 问题下载依赖项

Question

在创建我们的 Dataproc Spark 集群时，我们通过--properties spark:spark.jars.packages=mysql:mysql-connector-java:6.0.6 到 gcloud dataproc clusters create 命令。

这是为了将我们的 PySpark 脚本保存到 CloudSQL

显然在创建时这不会执行任何操作，但在第一个 spark-submit 时这将尝试解决此依赖关系。

从技术上讲，它似乎解析并下载了必要的 jar 文件，但由于 spark-submit

发出的警告，集群上的第一个任务将失败

Exception in thread "main" java.lang.RuntimeException: [download failed: mysql#mysql-connector-java;6.0.6!mysql-connector-java.jar]
    at org.apache.spark.deploy.SparkSubmitUtils$.resolveMavenCoordinates(SparkSubmit.scala:1177)
    at org.apache.spark.deploy.SparkSubmit$.prepareSubmitEnvironment(SparkSubmit.scala:298)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:153)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:119)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

完整的输出是:

Ivy Default Cache set to: /root/.ivy2/cache
The jars for the packages stored in: /root/.ivy2/jars
:: loading settings :: url = jar:file:/usr/lib/spark/jars/ivy-2.4.0.jar!/org/apache/ivy/core/settings/ivysettings.xml
mysql#mysql-connector-java added as a dependency
:: resolving dependencies :: org.apache.spark#spark-submit-parent;1.0
    confs: [default]
    found mysql#mysql-connector-java;6.0.6 in central
downloading https://repo1.maven.org/maven2/mysql/mysql-connector-java/6.0.6/mysql-connector-java-6.0.6.jar ...
:: resolution report :: resolve 527ms :: artifacts dl 214ms
    :: modules in use:
    mysql#mysql-connector-java;6.0.6 from central in [default]
    ---------------------------------------------------------------------
    |                  |            modules            ||   artifacts   |
    |       conf       | number| search|dwnlded|evicted|| number|dwnlded|
    ---------------------------------------------------------------------
    |      default     |   1   |   1   |   1   |   0   ||   1   |   0   |
    ---------------------------------------------------------------------

:: problems summary ::
:::: WARNINGS
        [FAILED     ] mysql#mysql-connector-java;6.0.6!mysql-connector-java.jar: Downloaded file size doesn't match expected Content Length for https://repo1.maven.org/maven2/mysql/mysql-connector-java/6.0.6/mysql-connector-java-6.0.6.jar. Please retry. (212ms)

        [FAILED     ] mysql#mysql-connector-java;6.0.6!mysql-connector-java.jar: Downloaded file size doesn't match expected Content Length for https://repo1.maven.org/maven2/mysql/mysql-connector-java/6.0.6/mysql-connector-java-6.0.6.jar. Please retry. (212ms)

    ==== central: tried

      https://repo1.maven.org/maven2/mysql/mysql-connector-java/6.0.6/mysql-connector-java-6.0.6.jar

        ::::::::::::::::::::::::::::::::::::::::::::::

        ::              FAILED DOWNLOADS            ::

        :: ^ see resolution messages for details  ^ ::

        ::::::::::::::::::::::::::::::::::::::::::::::

        :: mysql#mysql-connector-java;6.0.6!mysql-connector-java.jar

        ::::::::::::::::::::::::::::::::::::::::::::::

但是集群上的后续任务显示此输出

Ivy Default Cache set to: /root/.ivy2/cache
The jars for the packages stored in: /root/.ivy2/jars
:: loading settings :: url = jar:file:/usr/lib/spark/jars/ivy-2.4.0.jar!/org/apache/ivy/core/settings/ivysettings.xml
mysql#mysql-connector-java added as a dependency
:: resolving dependencies :: org.apache.spark#spark-submit-parent;1.0
    confs: [default]
    found mysql#mysql-connector-java;6.0.6 in central
:: resolution report :: resolve 224ms :: artifacts dl 5ms
    :: modules in use:
    mysql#mysql-connector-java;6.0.6 from central in [default]
    ---------------------------------------------------------------------
    |                  |            modules            ||   artifacts   |
    |       conf       | number| search|dwnlded|evicted|| number|dwnlded|
    ---------------------------------------------------------------------
    |      default     |   1   |   0   |   0   |   0   ||   1   |   0   |
    ---------------------------------------------------------------------
:: retrieving :: org.apache.spark#spark-submit-parent
    confs: [default]
    0 artifacts copied, 1 already retrieved (0kB/7ms)

所以我的问题是:

1. 是什么原因造成的？GCP 的优秀人员可以解决这个问题吗？
2. 除了运行允许在集群启动时失败的虚拟任务之外，是否有临时解决方法？

Answer 1

您重现它的一致性如何？在尝试使用不同的集群设置重现后，我的最佳理论是这可能是一个返回 5xx 错误的重载服务器。

就解决方法而言:

1) 从 Maven Central 下载 jar 并在提交作业时使用 --jars 选项传递。如果您经常创建新集群，那么通过初始化操作将此文件暂存到集群上是可行的方法。

2) 通过指向 Google Maven Central 镜像的 spark.jars.ivySettings 属性提供备用 ivy 设置文件(这应该减少/消除 5xx 错误的几率)

查看这篇文章: https://www.infoq.com/news/2015/11/maven-central-at-google