[server] Avoid memory copy when follower fetch log from leader#1186
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Purpose
Linked issue: close #1183
As described in #1183, the current Fluss server consumes excessive heap memory and triggers frequent GC. Debugging revealed that this memory footprint stems from an off-heap to heap memory copy during follower-to-leader data sync. This PR aims to resolve this issue by eliminating the unnecessary copy. Post-fix, heap memory usage is significantly reduced, with before-and-after results shown below:
before fix:
after fix:
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