rnewson commented on PR #4679:
URL: https://github.com/apache/couchdb/pull/4679#issuecomment-1640198515
make a file to be used as an attachment;
```
#!/usr/bin/env python3
file_size = 1 * 1024 * 1024
chunk_size = 8 * 1024
int_size = 16
with open('att', 'bw') as f:
for i in range(file_size // chunk_size):
b = i.to_bytes(int_size, byteorder='big')
for k in range(chunk_size // int_size):
f.write(b)
```
create a database full of docs with multiple attachments
```
#!/usr/bin/env python3
import requests
auth = ('foo', 'bar')
base = 'http://127.0.0.1:5984/db1'
requests.delete(base, auth=auth)
requests.put(base, auth=auth)
for i in range(1000):
r = requests.put('{}/doc{}'.format(base, i), data='{}', auth=auth)
print('create doc {}: {}'.format(i, r.json()))
rev = r.json()['rev']
for j in range(4):
with open('att', 'rb') as f:
r = requests.put('{}/doc{}/att{}?rev={}'.format(base, i, j,
rev), data=f, auth=auth)
print('add att {} to doc {}: {}'.format(j, i, r.json()))
rev = r.json()['rev']
```
then try to replicate this database to a new, empty database. observe that
doc_write_failures is non-zero without the patch and reliably zero with the
patch.
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