[jira] [Created] (FLINK-11464) Implement DownloadCache

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-11464:
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             Summary: Implement DownloadCache
                 Key: FLINK-11464
                 URL: https://issues.apache.org/jira/browse/FLINK-11464
             Project: Flink
          Issue Type: Sub-task
          Components: E2E Tests
            Reporter: Chesnay Schepler
            Assignee: Chesnay Schepler
             Fix For: 1.8.0


h4. Problem

Several tests download archives for setting up systems, like Kafka of Elasticsearch. We currently do not cache downloads in any way, resulting in less stable tests (as mirrors aren't always available) and overall increased test duration (since the downloads at times are quite slow). The duration issue becomes especially apparent when running tests in a loop for debugging or release-testing purposes.
Finally, it also puts unnecessary strain on the download mirrors.

h4. Proposal

Add a {{DownloadCache}} interface with a single {{Path getOrDownload(String url, Path targetDir)}} method.
Access to and loading of implementations are handled like resources (see above).

The caching behavior is implementation-dependent.

A reasonable implementation should allow files may be cached in a user-provided directory, with an optional time-to-live for long-term setups.



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