[couchdb] 04/04: Handle attachments downgrades in a mixed cluster environment

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davisp pushed a commit to branch COUCHDB-3288-mixed-cluster-upgrade
in repository https://gitbox.apache.org/repos/asf/couchdb.git

commit fc3939c448802f3d0dc57e1709b389d86ecfe5e5
Author: Nick Vatamaniuc <va...@apache.org>
AuthorDate: Mon Jun 5 18:16:45 2017 -0400

    Handle attachments downgrades in a mixed cluster environment
    
    Previously attachment uploading from a PSE to non-PSE node would
    fail as the attachment streaming API changed between version.
    
    This commit handles downgrading attachment streams from PSE nodes so that
    non-PSE nodes can write them.
    
    COUCHDB-3288
---
 src/couch/src/couch_att.erl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/couch/src/couch_att.erl b/src/couch/src/couch_att.erl
index e78d6ef..4410727 100644
--- a/src/couch/src/couch_att.erl
+++ b/src/couch/src/couch_att.erl
@@ -486,6 +486,9 @@ flush(Fd, Att) ->
     flush_data(Fd, fetch(data, Att), Att).
 
 
+flush_data(Fd, {stream, {couch_bt_engine_stream, {OtherFd, StreamPointer}}},
+        Att) ->
+    flush_data(Fd, {OtherFd, StreamPointer}, Att);
 flush_data(Fd, {Fd0, _}, Att) when Fd0 == Fd ->
     % already written to our file, nothing to write
     Att;

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