What causes SocketException (9001) handling request in node.js app and MongoDB ReplicaSet? -


i have simple node.js application makes single call connection call replicaset. things working fine earlier today , nothing changed in application, connection failing (silently) , i'm seeing following in mongod logs.

thu apr 18 17:16:56 [conn1782026] end connection 10.x.x.x:50720 (40 connections open) thu apr 18 17:16:57 [initandlisten] connection accepted 10.x.x.x:50721 #1782027 (41 connections open) thu apr 18 17:16:57 [initandlisten] connection accepted 10.x.x.x:50722 #1782028 (42 connections open) thu apr 18 17:16:57 [initandlisten] connection accepted 10.x.x.x:50723 #1782029 (43 connections open) thu apr 18 17:16:57 [initandlisten] connection accepted 10.x.x.x:50724 #1782030 (44 connections open) thu apr 18 17:16:57 [initandlisten] connection accepted 10.x.x.x:50725 #1782031 (45 connections open) thu apr 18 17:16:57 [initandlisten] connection accepted 10.x.x.x:50736 #1782032 (46 connections open) [conn1782028] socketexception handling request, closing client connection: 9001 socket exception [2] server [10.x.x.x:50722]

i haven't been able track down causes or how fix it.

here's connection code:

var _ = require("underscore"); var db_options = {     db:{             w:1,             native_parser: false         },     server:{         auto_reconnect:true,         socketoptions: {}     },     replset:{         rs_name: "my_replset_name",         readpreference: "secondary"     },     mongos: {} }; db.client.connect("mongodb://server1:27017,server2:27017,server3:27017/my_database", db_options, function(err, _db){     if(err){         console.log(err);     }else{         _db.collection("my_collection", function(err, collection){             collection.find({q:1}).toarray(function(err,item){                 if(err){                     console.log(err);                 }else{                     _.each(item, function(r){                         if(!_.isempty(r)){                             // item!                             console.log(r._id);                         }                     });                     console.log("finished.");                 }             });         });     } });

i'm running replicaset on ec2 , can connect each otherhave simple node.js application makes single call connection call replicaset - said, worked , stopped working without notice.

does have insights this? causes it? how prevent it? how fix it?

if os rhel5.x, default system parameter
net.ipv4.tcp_mem=196608 262144 393216
change to:
net.ipv4.tcp_mem=786432 1048576 1572864

4k(perpage) * 1572864(page)=6g (max tcp memory), default 1.5g


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