PredictionIO 0.12.1 - 未找到引擎。您的构建可能失败。中止答案

【问题标题】：PredictionIO 0.12.1 - No engine found. Your build might have failed. AbortingPredictionIO 0.12.1 - 未找到引擎。您的构建可能失败。中止
【发布时间】：2018-05-21 07:29:43
【问题描述】：

我已经使用 Binary Distribution 安装了 PredictionIO 0.12.1，我已经成功启动了 pio。之后我使用了快速入门 - 电子商务推荐引擎模板。在构建时，我收到错误消息“[ERROR] [Engine$] No engine found. Your build may have failed. Aborting.”

fh@fh:~/fh_engines/MyECommerceRecommendation$ pio build --verbose
[INFO] [Engine$] Using command '/home/fh/PredictionIO-0.12.1/sbt/sbt' at /home/fh/fh_engines/MyECommerceRecommendation to build.
[INFO] [Engine$] If the path above is incorrect, this process will fail.
[INFO] [Engine$] Uber JAR disabled. Making sure lib/pio-assembly-0.12.1.jar is absent.
[INFO] [Engine$] Going to run: /home/fh/PredictionIO-0.12.1/sbt/sbt  package assemblyPackageDependency in /home/fh/fh_engines/MyECommerceRecommendation
[INFO] [Engine$] [info] Loading project definition from /home/fh/.sbt/0.13/staging/a8733a2463247b8ef5ff/myecommercerecommendation/project
[INFO] [Engine$] [info] Set current project to template-scala-parallel-ecommercerecommendation (in build file:/home/fh/fh_engines/MyECommerceRecommendation/)
[INFO] [Engine$] [success] Total time: 1 s, completed 21 May, 2018 10:42:05 AM
[INFO] [Engine$] [info] Including from cache: scala-library-2.11.8.jar
[INFO] [Engine$] [info] Checking every *.class/*.jar file's SHA-1.
[INFO] [Engine$] [info] Merging files...
[INFO] [Engine$] [warn] Merging 'META-INF/MANIFEST.MF' with strategy 'discard'
[INFO] [Engine$] [warn] Strategy 'discard' was applied to a file
[INFO] [Engine$] [info] Assembly up to date: /home/fh/.sbt/0.13/staging/a8733a2463247b8ef5ff/myecommercerecommendation/target/scala-2.11/template-scala-parallel-ecommercerecommendation-assembly-0.1-SNAPSHOT-deps.jar
[INFO] [Engine$] [success] Total time: 1 s, completed 21 May, 2018 10:42:06 AM
[INFO] [Engine$] Compilation finished successfully.
[INFO] [Engine$] Looking for an engine...
[ERROR] [Engine$] No engine found. Your build might have failed. Aborting.
fh@fh:~/fh_engines/MyECommerceRecommendation$

【问题讨论】：

您是否错过了下载引擎和设置engine.json 的步骤？它的源代码托管在某个地方的 GitHub 上，具体取决于您使用的引擎。
不。我已经正确下载了引擎。

标签： predictionio

【解决方案1】：

在与二进制发行版苦苦挣扎之后，我下载了源代码并构建了具有所需依赖项的二进制文件。

这是一个权限问题。我使用的是 Ubuntu 18.04，我需要提供对特定模板文件夹的读取权限（在本例中为 MyECommerceRecommendation）

在给予许可后，它工作正常。

谢谢，

【讨论】：

【解决方案2】：

您可以在部署时指定引擎实例 id，训练完成后您可以通过 greping EngineInstaceId 获得。

【讨论】：