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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