nickva opened a new pull request, #5395:
URL: https://github.com/apache/couchdb/pull/5395
It's a 10 year old undocumented config that never worked properly. We tried
using it at Cloudant initially then promptly disabled it and never touched it
again.
What usually reports corruption fairly well is the "read beyond eof" check.
As such improve that error:
* Show the total bytes requested
* Show both the current record file position and the actual file size
In some cases we relied on badmatch for error reporting. Instead, use the
early throw gen_server trick to return a proper error with a file path and
position if pread fail.
Improve tests, and make sure to cover the case of external truncation. An
operator might truncate a file by hand, or a partial file send.
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