lokidundun opened a new pull request, #724:
URL: https://github.com/apache/hugegraph-toolchain/pull/724

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   ## Purpose of the PR
   
   - close #723  <!-- or use "fix #xxx", "xxx" is the ID-link of related issue, 
e.g: close #1024 -->
   
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associated with an issue.
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   ## Main Changes
   
   <!-- Please clarify what changes you are proposing. The purpose of this 
section is to outline the changes and how this PR fixes the issue. These change 
logs are helpful for better ant faster reviews.)
   
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   - If you introduce a new feature, please show detailed design here or add 
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   1. .github/workflows/loader-ci.yml
     - Migrated MySQL to GitHub Actions services: Adopted the official 
`mysql:5.7` container service with health check configured. This eliminates the 
need to execute `docker pull` and `docker run` for every workflow run.
     - Added Hadoop caching: Cached `~/hadoop-2.8.5.tar.gz` with a fixed cache 
key `hadoop-2.8.5`.
     - Added HugeGraph Server caching: Cached `~/hugegraph-cache-${{ 
env.COMMIT_ID }}`; the cache key contains the commit ID to enable 
auto-invalidation when the version changes.
     - Removed the invocation of `install-mysql.sh`: MySQL is now provisioned 
by GitHub Actions services.
   
   2. hugegraph-loader/assembly/travis/install-hadoop.sh
     - Added local installation & cache validation: Skip re-download/extraction 
if `/usr/local/hadoop` already exists; use the cached tar.gz file directly if 
it exists (while the local directory is missing) to avoid repeated downloads 
from archive.apache.org.
     - Added writes to `GITHUB_ENV`: Ensure subsequent steps can correctly 
obtain `HADOOP_HOME` and `PATH` environment variables.
     - Made configuration writes idempotent: Only write `core-site.xml` and 
`hdfs-site.xml` if the configuration files do not exist or their content is 
mismatched.
   
   3. hugegraph-loader/assembly/travis/install-mysql.sh
     - Added idempotent check: Directly skip `docker pull` and `docker run` if 
the `mysql:5.7` container is already running (e.g., provided by GitHub Actions 
services).
   
   4. hugegraph-loader/assembly/travis/install-hugegraph-from-source.sh
     - Added build caching: Check if the packaged `apache-hugegraph-*.tar.gz` 
exists in `~/hugegraph-cache-${COMMIT_ID}` before building. Use the cached 
tarball directly and skip the time-consuming `git clone` + `mvn package` if it 
exists; copy the tarball to the cache directory for reuse in future runs after 
the build if it does not exist.
   
   ## Verifying these changes
   
   <!-- Please pick the proper options below -->
   
   - [ ] Trivial rework / code cleanup without any test coverage. (No Need)
   - [ ] Already covered by existing tests, such as *(please modify tests 
here)*.
   - [ ] Need tests and can be verified as follows:
       - xxx
   
   ## Does this PR potentially affect the following parts?
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   - [ ]  Nope
   - [ ]  Dependencies (add/update license info) <!-- Don't forget to 
add/update the info in "LICENSE" & "NOTICE" files (both in root & dist module) 
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   - [ ]  Modify configurations
   - [ ]  The public API
   - [ ]  Other affects (typed here)
   
   ## Documentation Status
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   - [ ]  `Doc - TODO` <!-- Your PR changes impact docs and you will update 
later -->
   - [ ]  `Doc - Done` <!-- Related docs have been already added or updated -->
   - [ ]  `Doc - No Need` <!-- Your PR changes don't impact/need docs -->
   


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