Support cache clean policy

[cheyang]

Signed-off-by: cheyang [email protected]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

fixes #2526

Ⅲ. List the added test cases (unit test/integration test) if any, please explain if no tests are needed.

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[fluid-e2e-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please ask for approval from cheyang by writing /assign @cheyang in a comment. For more information see:The Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment

[codecov[bot]]

Codecov Report

Merging #2527 (68c2b9d) into master (7c5661a) will increase coverage by 0.00%. The diff coverage is 67.74%.

:exclamation: Current head 68c2b9d differs from pull request most recent head 6b01e70. Consider uploading reports for the commit 6b01e70 to get more accurate results

@@           Coverage Diff           @@
##           master    #2527   +/-   ##
=======================================
  Coverage   67.55%   67.55%           
=======================================
  Files         367      368    +1     
  Lines       21267    21298   +31     
=======================================
+ Hits        14366    14387   +21     
- Misses       5218     5224    +6     
- Partials     1683     1687    +4     

Impacted Files	Coverage Δ
pkg/ddc/alluxio/transform_clean_cache_policy.go	66.66% <66.66%> (ø)
pkg/ddc/alluxio/transform.go	61.95% <100.00%> (+0.13%)	:arrow_up:

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.