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Chris Lu
25cfeb3a2a
Building on the io.Pipe streaming chunk copy: when a copy operation
covers an entire source chunk (the common case for Harbor's
part-size = chunk-size assemble pattern), ask the source volume for
compressed bytes via Accept-Encoding: gzip and forward them to the
destination as-is.
This trades a Range fetch (where the volume decompresses the chunk
internally to satisfy the byte range) for a full-chunk fetch that
returns whatever wire bytes the chunk is stored as. For gzipped
chunks the source volume avoids the decompression entirely; we never
allocate a chunk-sized decompress buffer.
Implementation: build the source GET directly instead of going
through ReadUrlAsStream, because that helper auto-decompresses gzip
responses (which would defeat the point). Trust the response's
Content-Encoding header over caller hints — for partial ranges the
volume always returns raw bytes regardless of how the chunk is
stored, so labeling those as gzip would corrupt subsequent reads.
End-to-end repro impact (512 MiB src, 6 parallel UploadPartCopy):
+ #9420/#9421/#9422 : 2236 MiB
+ io.Pipe streaming : 1521 MiB
+ this commit : 1149 MiB (round 2 RSS, perfectly flat)
Round 3 now completes (was hitting volume-full before, since
chunks took up uncompressed space on disk; we now store the gzipped
chunks the volume gives us, which fit in the test's 8 GiB volume
budget).
Heap inuse_space (after force GC):
before all: ~1.5 GiB
this PR: 266 MiB
Volume-side bytes.Buffer.ReadFrom inuse:
before: 611 MiB
streaming: 571 MiB
this PR: 297 MiB (now in destination-volume parseUpload's
size-hint decompression — separate
optimization opportunity for a hint header)