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https://issues.apache.org/jira/browse/COUCHDB-2859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14985762#comment-14985762
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Klaus Trainer commented on COUCHDB-2859:
----------------------------------------
Robert Newson's idea for an implementation that should be no more expensive
than what we do today (see the [related
discussion|https://github.com/apache/couchdb-chttpd/pull/90#discussion_r43617014]):
{quote}
1) delay the response until we have heard from one shard of each range (I
believe we already added this, but do check)
2) from this, construct the etag (we can change the workers to return more
information along with their first rows (if any)
3) send 304 if the etag matches the header
That is, we have to hear from one shard per range to form the view, so we can
build a useful etag from that.
{quote}
> View-Etags not working on cluster
> ---------------------------------
>
> Key: COUCHDB-2859
> URL: https://issues.apache.org/jira/browse/COUCHDB-2859
> Project: CouchDB
> Issue Type: Bug
> Reporter: Sebastian Rothbucher
> Priority: Blocker
> Fix For: 2.0.0
>
>
> (from list_views.js Integration test)
> 2 Reproduce: Query view, grab etag, query view again with -H 'if-none-match:
> <etag>'
> Complete run:
> {noformat}
> [root@localhost couchdb]# curl -X GET
> 'http://localhost:15984/test_suite_db/_design/vtest/_view/v' -v
> * About to connect() to localhost port 15984 (#0)
> * Trying ::1...
> * Verbindungsaufbau abgelehnt
> * Trying 127.0.0.1...
> * Connected to localhost (127.0.0.1) port 15984 (#0)
> > GET /test_suite_db/_design/vtest/_view/v HTTP/1.1
> > User-Agent: curl/7.29.0
> > Host: localhost:15984
> > Accept: */*
> >
> < HTTP/1.1 200 OK
> < Cache-Control: must-revalidate
> < Content-Type: text/plain; charset=utf-8
> < Date: Sat, 17 Oct 2015 16:44:07 GMT
> < ETag: "16d73d700397bb00da24d90cde000bd1"
> < Server: CouchDB/8924e94 (Erlang OTP/17)
> < Transfer-Encoding: chunked
> < X-Couch-Request-ID: 63c44f488f
> < X-CouchDB-Body-Time: 0
> <
> {"total_rows":1,"offset":0,"rows":[
> {"id":"testdel","key":null,"value":null}
> ]}
> * Connection #0 to host localhost left intact
> [root@localhost couchdb]# curl -X GET
> 'http://localhost:15984/test_suite_db/_design/vtest/_view/v' -v -H
> 'if-none-match: "16d73d700397bb00da24d90cde000bd1"'
> * About to connect() to localhost port 15984 (#0)
> * Trying ::1...
> * Verbindungsaufbau abgelehnt
> * Trying 127.0.0.1...
> * Connected to localhost (127.0.0.1) port 15984 (#0)
> > GET /test_suite_db/_design/vtest/_view/v HTTP/1.1
> > User-Agent: curl/7.29.0
> > Host: localhost:15984
> > Accept: */*
> > if-none-match: "16d73d700397bb00da24d90cde000bd1"
> >
> < HTTP/1.1 200 OK
> < Cache-Control: must-revalidate
> < Content-Type: text/plain; charset=utf-8
> < Date: Sat, 17 Oct 2015 16:44:24 GMT
> < ETag: "16d73d700397bb00da24d90cde00194f"
> < Server: CouchDB/8924e94 (Erlang OTP/17)
> < Transfer-Encoding: chunked
> < X-Couch-Request-ID: 9a3cd3257b
> < X-CouchDB-Body-Time: 0
> <
> {"total_rows":1,"offset":0,"rows":[
> {"id":"testdel","key":null,"value":null}
> ]}
> * Connection #0 to host localhost left intact
> [root@localhost couchdb]#
> {noformat}
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