*: fix drainer can't send request correctly to pump when set compressor=gzip (#1186) #1188
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This is an automated cherry-pick of #1186
What problem does this PR solve?
Issue Number: close #1152
What is changed and how it works?
See #1152 (comment), add 4MB buffer for max grpc message size.
Check List
Tests
Test playground with compressor, works correctly.
Related changes
Release note