Mike Wallace created COUCHDB-2804:
-------------------------------------
Summary: The fast_view optimisation for view-filtered changes
feeds is not cluster-aware
Key: COUCHDB-2804
URL: https://issues.apache.org/jira/browse/COUCHDB-2804
Project: CouchDB
Issue Type: Bug
Security Level: public (Regular issues)
Reporter: Mike Wallace
The view changes functionality (the most up-to-date documentation I am aware of
being here: https://github.com/rcouch/rcouch/wiki/View-Changes) needs some work
to make the fast_view optimisation work via the clustered interface.
This has been tested using the following script:
https://gist.github.com/mikewallace1979/1f53f186e48bb888c256#file-test_fast_view-sh
Running it against the admin port on 15986 produces a successful response [1]
although people with an eye for detail will notice a secondary bug where the
first change isn't included.
Running it against the clustered port on 15984 produces a stack trace [2]:
{code}
{"error":"error","reason":"{function_clause,nil,\n [{couch_changes,filter,\n
[{db,<26600.3277.0>,nil,<<\"1441816974537529\">>,<26600.3259.0>,\n
#Ref<26600.0.0.19015>,\n {db_header,6,1,0,\n
{4310,{1,0,{size_info,68,105}},96},\n {4406,1,93},\n
{21426,[],1273},\n
0,nil,nil,1000,<<\"585e0d4edddc04b8423fee965a730e4c\">>,\n
[{'[email protected]',0}],\n 0},\n 1,\n
{btree,<26600.3259.0>,\n
{4310,{1,0,{size_info,68,105}},96},\n
#Fun<couch_db_updater.btree_by_id_split.1>,\n
#Fun<couch_db_updater.btree_by_id_join.2>,undefined,\n
#Fun<couch_db_updater.btree_by_id_reduce.2>,snappy},\n
{btree,<26600.3259.0>,\n {4406,1,93},\n
#Fun<couch_db_updater.btree_by_seq_split.1>,\n
#Fun<couch_db_updater.btree_by_seq_join.2>,undefined,\n
#Fun<couch_db_updater.btree_by_seq_reduce.2>,snappy},\n
{btree,<26600.3259.0>,\n {21426,[],1273},\n
undefined,undefined,undefined,nil,snappy},\n
1,<<\"shards/c0000000-dfffffff/test_db.1441816974\">>,\n
\"/Users/mikewallace/src/asf/couchdb/dev/lib/node2/data/shards/c0000000-dfffffff/test_db.1441816974.couch\",\n
undefined,[],nil,\n {user_ctx,null,[],undefined},\n
nil,1000,\n
[before_header,after_header,on_file_open],\n [create],\n
snappy,nil,nil},\n {doc_info,<<\"doge\">>,1,\n
[{rev_info,\n {1,\n
<<174,50,232,100,203,90,27,198,130,81,79,221,160,216,74,\n
128>>},\n 1,false,4242}]},\n {fast_view,main_only,\n
{doc,<<\"_design/fastview\">>,\n {1,\n
[<<8,240,229,73,29,55,237,140,209,212,55,78,252,52,73,20>>]},\n
{[{<<\"views\">>,\n {[{<<\"doge\">>,\n
{[{<<\"map\">>,\n <<\"function(doc) { if
(true) { emit(doc.id, 1); }};\">>}]}}]}},\n
{<<\"options\">>,{[{<<\"seq_indexed\">>,true}]}}]},\n
[],false,[]},\n <<\"doge\">>}],\n
[{file,\"src/couch_changes.erl\"},{line,243}]},\n
{fabric_rpc,changes_enumerator,2,\n
[{file,\"src/fabric_rpc.erl\"},{line,328}]},\n
{couch_btree,stream_kv_node2,8,[{file,\"src/couch_btree.erl\"},{line,783}]},\n
{couch_btree,fold,4,[{file,\"src/couch_btree.erl\"},{line,220}]},\n
{couch_db,changes_since,5,[{file,\"src/couch_db.erl\"},{line,1225}]},\n
{fabric_rpc,changes,4,[{file,\"src/fabric_rpc.erl\"},{line,68}]},\n
{rexi_server,init_p,3,[{file,\"src/rexi_server.erl\"},{line,139}]}]}"}
{code}
So it looks like we need to do a bit of work in fabric to make it aware of the
fast_view optimisation.
[1]
https://gist.github.com/mikewallace1979/1f53f186e48bb888c256#file-output_admin_port-md
[2]
https://gist.github.com/mikewallace1979/1f53f186e48bb888c256#file-output_cluster_port-md
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