In EC PUT request case, proxy-server may send commits to object-servers
it may make .durable file even though the request failed due to a lack
of quorum number.
For example:
- Considering the case that almost all object-servers fail by 422
Unprocessable Entity
- Using ec scheme 4 + 2
- 5 (quorum size) object-server failed with 422, 1 object-servers
succeeded as 201 created
How it works:
- Client creates a PUT request
- Proxy will open connections to backend object-servers
- Proxy will send whole encoded chunks to object-servers
- Proxy will send content-md5 as footers.
- Proxy will get responses [422, 422, 422, 422, 422, 201] (currently
this list will be regarded as "we have quorum response")
- And then proxy will send commits to object-servers (the only
object-server with 201 will create .durable file)
- Proxy will return 503 because the commits results in no response
statuses from object-servers except the 201 node.
This patch fixes the quorum handling at ObjectController to check
that it has *successful* quorum responses before sending durable commits.
Closes-Bug: #1491748
Change-Id: Icc099993be76bcc687191f332db56d62856a500f
8f1c7409e7