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#!/usr/bin/env bash
: '
This script tests whether uploaded parts can be skipped in a
CompleteMultipartUpoad
On Minio: yes, parts can be skipped
On S3: not tested
Sample output (on Minio):
f23911bcd1230f5ebe8887cbf5bc396e part1
a2657143167eaf647c40473e78a091dc part4
72f72c02c5163bc81024b28ac818c5e0 part5
e29cf500d20498218904b8df8806caa2 part6
Upload ID: e8fe7b83-9800-46fb-ae90-9d7ccd42fe76
PART 1 ETag: "f23911bcd1230f5ebe8887cbf5bc396e"
PART 4 ETag: "a2657143167eaf647c40473e78a091dc"
PART 5 ETag: "72f72c02c5163bc81024b28ac818c5e0"
PART 6 ETag: "e29cf500d20498218904b8df8806caa2"
======================================== COMPLETE ====
{
"Location": "http://localhost:9000/test/upload",
"Bucket": "test",
"Key": "upload",
"ETag": "\"48246e44d4b38bdc2f3c10ee25b1af17-3\""
}
======================================== GET FULL ====
{
"AcceptRanges": "bytes",
"LastModified": "2023-04-25T10:54:35+00:00",
"ContentLength": 31457280,
"ETag": "\"48246e44d4b38bdc2f3c10ee25b1af17-3\"",
"ContentType": "binary/octet-stream",
"Metadata": {}
}
97fb904da7ad310699a6afab0eb6e061 get-full
97fb904da7ad310699a6afab0eb6e061 -
======================================== GET PART 3 ====
{
"AcceptRanges": "bytes",
"LastModified": "2023-04-25T10:54:35+00:00",
"ContentLength": 10485760,
"ETag": "\"48246e44d4b38bdc2f3c10ee25b1af17-3\"",
"ContentRange": "bytes 20971520-31457279/31457280",
"ContentType": "binary/octet-stream",
"Metadata": {},
"PartsCount": 3
}
e29cf500d20498218904b8df8806caa2 get-part3
Conclusions:
- Skipping a part in a CompleteMultipartUpoad call is OK
- The part is simply not included in the stored object
- Sequential part renumbering counts only non-skipped parts
'
export AWS_ACCESS_KEY_ID=1D8Pk2k4oQSoh1BU
export AWS_SECRET_ACCESS_KEY=4B46SR8U7FUgY0raB8Zuxg1NLyLTvbNV
function aws { command aws --endpoint-url http://localhost:9000 $@ ; }
aws --version
aws s3 mb s3://test
for NUM in 1 4 5 6; do
dd if=/dev/urandom of=part$NUM bs=1M count=10
done
md5sum part*
UPLOAD=$(aws s3api create-multipart-upload --bucket test --key 'upload' | jq -r ".UploadId")
echo "Upload ID: $UPLOAD"
PARTS=""
for NUM in 1 4 5 6; do
ETAG=$(aws s3api upload-part --bucket test --key 'upload' --part-number $NUM \
--body "part$NUM" --upload-id "$UPLOAD" | jq -r ".ETag")
echo "PART $NUM ETag: $ETAG"
if [ "$NUM" != "5" ]; then
if [ -n "$PARTS" ]; then
PARTS="$PARTS,"
fi
PARTS="$PARTS {\"ETag\":$ETAG,\"PartNumber\":$NUM}"
fi
done
echo "======================================== COMPLETE ===="
echo "{\"Parts\":[$PARTS]}" > mpu
aws s3api complete-multipart-upload --multipart-upload file://mpu \
--bucket test --key 'upload' --upload-id "$UPLOAD"
echo "======================================== GET FULL ===="
aws s3api get-object --bucket test --key upload get-full
md5sum get-full
cat part1 part4 part6 | md5sum
echo "======================================== GET PART 3 ===="
aws s3api get-object --bucket test --key upload --part-number 3 get-part3
md5sum get-part3
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