[cpd-2.8]feat: Global variable

[zhujian7]

What this PR does / why we need it:

Cherry-pick of #1151 #1159 #1173

Which issue(s) this PR is related to (optional, link to 3rd issue(s)):

Fixes #

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Special notes for your reviewer:

/cc @supereagle @hyy0322

Release note:

NONE

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[supereagle]

/lgtm

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