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https://issues.apache.org/jira/browse/COUCHDB-597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792700#action_12792700
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Robert Newson commented on COUCHDB-597:
---------------------------------------
I can reproduce at least one problem with replication with the script below. If
executed serially, the tasks complete, but if issued in parallel, they do not;
#!/bin/sh
URL=http://localhost:5984
dd if=/dev/zero of=att bs=60k count=1
curl -X DELETE $URL/db1
curl -X DELETE $URL/db2
curl -X DELETE $URL/db3
curl -X DELETE $URL/db4
curl -X DELETE $URL/db5
curl -X PUT $URL/db1
for COUNT in {0..100000}
do
curl -s -X PUT -d '{"text":"some text goes here, oh yes."}'
$URL/db1/doc$((COUNT * 2)) > /dev/null
curl -s -H "Expect: " -X PUT --data-binary @att $URL/db1/doc$((COUNT * 2 +
1))/att > /dev/null
done
# At least one of these tasks will fail.
curl http://localhost:5984/_replicate -d
"{\"source\":\"$URL/db1\",\"target\":\"db2\",\"create_target\":true}" &
curl http://localhost:5984/_replicate -d
"{\"source\":\"$URL/db1\",\"target\":\"db3\",\"create_target\":true}" &
curl http://localhost:5984/_replicate -d
"{\"source\":\"$URL/db1\",\"target\":\"db4\",\"create_target\":true}" &
curl http://localhost:5984/_replicate -d
"{\"source\":\"$URL/db1\",\"target\":\"db5\",\"create_target\":true}" &
wait
> Replication tasks crash.
> ------------------------
>
> Key: COUCHDB-597
> URL: https://issues.apache.org/jira/browse/COUCHDB-597
> Project: CouchDB
> Issue Type: Bug
> Components: Database Core
> Affects Versions: 0.11
> Reporter: Robert Newson
>
> If I kick off 10 replication tasks in quick succession, occasionally one or
> two of the replication tasks will die and not be resumed. It seems that the
> stat tracking is a little buggy, and under stress can eventually cause a
> permanent failure of the supervised replication task;
> [Fri, 11 Dec 2009 19:00:08 GMT] [error] [<0.80.0>] {error_report,<0.30.0>,
> {<0.80.0>,supervisor_report,
> [{supervisor,{local,couch_rep_sup}},
> {errorContext,shutdown_error},
> {reason,killed},
> {offender,
> [{pid,<0.6700.11>},
> {name,"fcbb13200a1618cf983b347f4d2c9835+create_target"},
> {mfa,
> {gen_server,start_link,
> [couch_rep,
> ["fcbb13200a1618cf983b347f4d2c9835",
> {[{<<"create_target">>,true},
> {<<"source">>,<<"http://node:5984/perf-p2";>>},
> {<<"target">>,<<"perf-p2">>}]},
> {user_ctx,null,[<<"_admin">>]}],
> []]}},
> {restart_type,temporary},
> {shutdown,1},
> {child_type,worker}]}]}}
> [Fri, 11 Dec 2009 19:00:08 GMT] [error] [emulator] Error in process
> <0.6705.11> with exit value:
> {badarg,[{ets,insert,[stats_hit_table,{{couchdb,open_os_files},-1}]},{couch_stats_collector,decrement,1}]}
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