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https://issues.apache.org/jira/browse/COUCHDB-1986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13849272#comment-13849272
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Jan Lehnardt commented on COUCHDB-1986:
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Some more testing today, bumping the test timeout waiting for replication to
finish from 300000 to 600000 makes this pass again.
Looking at the request log can see that PUTing docs to the remote db takes
disproportionally long (1 minute + a few seconds each):
[Mon, 16 Dec 2013 12:23:27 GMT] [info] [<0.321.0>] 127.0.0.1 - - PUT
/couch_test_rep_db_b/_local/8831f8738b3333d5d17e00da7
1581b23 201
[Mon, 16 Dec 2013 12:24:30 GMT] [info] [<0.322.0>] 127.0.0.1 - - PUT
/couch_test_rep_db_b/doc5?new_edits=false 201
[Mon, 16 Dec 2013 12:25:38 GMT] [info] [<0.322.0>] 127.0.0.1 - - PUT
/couch_test_rep_db_b/doc4?new_edits=false 201
[Mon, 16 Dec 2013 12:26:51 GMT] [info] [<0.322.0>] 127.0.0.1 - - PUT
/couch_test_rep_db_b/doc3?new_edits=false 201
[Mon, 16 Dec 2013 12:27:58 GMT] [info] [<0.322.0>] 127.0.0.1 - - PUT
/couch_test_rep_db_b/doc2?new_edits=false 201
[Mon, 16 Dec 2013 12:29:06 GMT] [info] [<0.322.0>] 127.0.0.1 - - PUT
/couch_test_rep_db_b/doc11?new_edits=false 201
[Mon, 16 Dec 2013 12:30:13 GMT] [info] [<0.322.0>] 127.0.0.1 - - PUT
/couch_test_rep_db_b/doc10?new_edits=false 201
[Mon, 16 Dec 2013 12:31:20 GMT] [info] [<0.322.0>] 127.0.0.1 - - PUT
/couch_test_rep_db_b/doc1?new_edits=false 201
[Mon, 16 Dec 2013 12:31:20 GMT] [info] [<0.322.0>] 127.0.0.1 - - POST
/couch_test_rep_db_b/_ensure_full_commit 201
After the last one all other requests come in at expected speeds.
I’m not too familiar with this part of the replicator code, so I couldn’t
quickly find why either the requests take that long, or why the replicator
waits a minute until it continues.
Another thing I tried was seeing whether the new R16B scheduling behaviour
introduced this, but running the test with
> ERL_FLAGS="+sws legacy" ./test/etap/run -v
> src/couch_replicator/test/04-replication-large-atts.t
and the original timeout still times out.
> 04-replication-large-atts.t times out
> -------------------------------------
>
> Key: COUCHDB-1986
> URL: https://issues.apache.org/jira/browse/COUCHDB-1986
> Project: CouchDB
> Issue Type: Bug
> Components: Replication
> Affects Versions: 1.5.0
> Reporter: Jan Lehnardt
>
> 04-replication-large-atts.t gets stuck around 558, sometimes a little earlier
> or later, but it times out eventually, regardless of the timeout. I tried
> doubling and such.
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