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Fixes #1312 Optimize ReadFullAsync to minimize memory allocations #1314

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Fixes #1312 Optimize ReadFullAsync to minimize memory allocations #1314

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cfa1dd9
Fixes #1312 Optimize ReadFullAsync to minimize memory allocations
pbolduc Jun 12, 2025
ca9784d
Merge branch 'master' into feature/put-object-read-performance
pbolduc Jun 13, 2025
ea876ac
Merge branch 'master' into feature/put-object-read-performance
ebozduman Jun 20, 2025
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14 changes: 4 additions & 10 deletions Minio/ApiEndpoints/ObjectOperations.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1130,21 +1130,15 @@ internal async Task<ReadOnlyMemory<byte>> ReadFullAsync(Stream data, int current
var totalRead = 0;
while (totalRead < currentPartSize)
{
Memory<byte> curData = new byte[currentPartSize - totalRead];
var curRead = await data.ReadAsync(curData[..(currentPartSize - totalRead)]).ConfigureAwait(false);
var curData = result[totalRead..currentPartSize];
var curRead = await data.ReadAsync(curData).ConfigureAwait(false);
if (curRead == 0) break;
for (var i = 0; i < curRead; i++)
curData.Slice(i, 1).CopyTo(result[(totalRead + i)..]);
totalRead += curRead;
}

if (totalRead == 0) return null;

if (totalRead == currentPartSize) return result;

Memory<byte> truncatedResult = new byte[totalRead];
for (var i = 0; i < totalRead; i++)
result.Slice(i, 1).CopyTo(truncatedResult[i..]);
return truncatedResult;
// Return only the valid portion without allocating a new buffer
return result[..totalRead];
}
}