erlang與多線程連接mongodb錯誤

Question

我使用localhost：27019,27020,27021作爲mongodb服務器 當我第一次用5個線程連接它時，每個進程讀取一個data.it會拋出異常。如果我使用3或更少的線程，它會沒事的。

，但是當我通過3線在連接與它取得成功，如果我用的100個相同的連接，它不會，除非我重新連接mongoserver拋出異常了。

  =ERROR REPORT==== 3-Aug-2013::11:28:37 === 
      ** Generic server <0.164.0> terminating 
      ** Last message in was {modify,#Fun<mvar.2.15158540>} 
      ** When Server state == {{dict,3,16,16,8,80,48, 
              {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[], 
              []}, 
              {{[],[],[], 
              [[{"192.168.17.100",27019}|{}]], 
              [], 
              [[{"192.168.17.100",27021}|{}]], 
              [],[],[],[],[],[], 
              [[{"192.168.17.100",27020}|{}]], 
              [],[],[]}}}, 
            #Fun<mvar.1.22957847>} 
      ** Reason for termination == 
      ** {badarg,[{dict,fetch, 
           [{"localhost",27021}, 
           {dict,3,16,16,8,80,48, 
            {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]}, 
            {{[],[],[], 
             [[{"192.168.17.100",27019}|{}]], 
             [], 
             [[{"192.168.17.100",27021}|{}]], 
             [],[],[],[],[],[], 
             [[{"192.168.17.100",27020}|{}]], 
             [],[],[]}}}]}, 
         {mongo_replset,remove_host,2}, 
         {sets,fold_bucket,3}, 
         {sets,fold_seg,4}, 
         {sets,fold_segs,4}, 
         {mongo_replset,'-fetch_member_info/1-fun-3-',3}, 
         {mvar,'-modify_/2-fun-0-',2}, 
         {mvar,handle_call,3}]} 
      Pid {<0.88.0>, 
       {badarg,[{dict,fetch, 
           [{"localhost",27021}, 
           {dict,3,16,16,8,80,48, 
             {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]}, 
             {{[],[],[], 
             [[{"192.168.17.100",27019}|{}]], 
             [], 
             [[{"192.168.17.100",27021}|{}]], 
             [],[],[],[],[],[], 
             [[{"192.168.17.100",27020}|{}]], 
             [],[],[]}}}]}, 
          {mongo_replset,remove_host,2}, 
          {sets,fold_bucket,3}, 
          {sets,fold_seg,4}, 
          {sets,fold_segs,4}, 
          {mongo_replset,'-fetch_member_info/1-fun-3-',3}, 
          {mvar,'-modify_/2-fun-0-',2}, 
          {mvar,handle_call,3}]}} Exit!!!!! 

Answer 1

你可以在錯誤日誌中看到，連接存儲在進程字典爲{"192.168.17.100",27019} ...... 而當它看起來的形式{"localhost",27021}的元組的程序失敗。顯然，你的本地主機地址必須是192.168.17.100，並且正在對不同的測試之間，你調用，直接與否，dict:fetch/2功能不同形式的本地主機（「本地主機」和「192.168.17.100」）。