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External resources: replace PVC-usage with dependency sources

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評估

難度
5/5
預估耗時
一週以上
新手友好度
25/100
Issue 類型
功能
描述清晰度
基本清楚
活躍度
停滯
技術堆疊
kubernetes, rust

研究方向

檢查目前以 PVC 為基礎的測試和文件,並在決定剩餘工作之前確認 issue #177 是否已實作。完成的標準是 dependencySources 可以在不使用共用 PVC 儲存空間的情況下提供 S3Bucket 等外部來源;或者,如果不存在 #177,則從測試和文件中移除 PVC 的使用。

由索引模型根據 Issue 內容生成。

描述

As a user I want to be able to make external resources and dependencies available to pods.

Previously this was implemented using PVCs, which was not independent of cluster capabilities (Access modes for PVCs etc.). A alternative solution is to dispense with PVCs and instead implement a dependencySources that will use a complex enum to expose different sources. In this example below, this will be an S3Bucket:-

---
apiVersion: s3.stackable.tech/v1alpha1
kind: S3Bucket
metadata:
  name: my-bucket-resource1
spec:
  bucketName: my-example-bucket1
  connection:
    reference: my-connection-resource
---
apiVersion: spark.stackable.tech/v1alpha1
kind: SparkApplication
...
spec:
  ...
  driver:
    ...
    dependencySources:
        # Use "#[serde(flatten)]" in a complex enum called e.g. "Source" 
        # allowing s3Bucket (and maybe hdfsFolder or url later on)
        - s3Bucket: # Option<S3BucketRef>
            inline: [...]
            # or
            reference: my-bucket-resource1

When a dependencySources is declared for a role, the contents of this source will be copied to an internally defined path (not visible to the user) on the respective pods, from where it can be accessed as required. In other words, where previously a job was started to copy resources to a (usually RWX) PVC - which was then used to back a volume mounted for roles - the same mechanism will be used without using shared storage. This adds some redundancy, but a) is independent of PV storage classes and b) is more transparent for the user.

If #177 has not been implemented, then:

  • remove PVC-usage from tests and documentation
    • N.B. inform @backstreetkiwi when this is complete so that node labels can be removed from T2 cluster nodes
主要語言
Rust
星號
32
分支
6
平均合併
1 天 9 小時
30 天內合併 PR
17

環境準備

  • 沒有 Dockerfile 或 Docker Compose 檔案
  • 有 Pull Request 範本
  • 沒有貢獻指南

從這裡開始

  1. 先讀完整個 Issue,再讀專案的貢獻指南。
  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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