Have the following codes:

try {
db = mongo.getDb("lp");
coll = db.getCollection("lp.mrtest");

if (enable_limit)

{ cur = coll.find(query).limit(20).addOption( Bytes.QUERYOPTION_SLAVEOK); } else { cur = coll.find(query).addOption(Bytes.QUERYOPTION_SLAVEOK); }
size = enable_limit ? cur.itcount() : cur.size();
} catch (Exception ex) {
System.out.println("count: get exception " + ex);
ex.printStackTrace();

db = mongo.getDb("lp");
coll = db.getCollection("lp.mrtest");
if (enable_limit) { cur = coll.find(query).limit(20).addOption( Bytes.QUERYOPTION_SLAVEOK); }

else

{ cur = coll.find(query).addOption(Bytes.QUERYOPTION_SLAVEOK); }
size = enable_limit ? cur.itcount() : cur.size();
System.out.println("count: get " + size);
} catch (Throwable t) {
System.out.println("count: get thowable " + t);
t.printStackTrace();

db = mongo.getDb("lp");
coll = db.getCollection("lp.mrtest");
if (enable_limit) { cur = coll.find(query).limit(20).addOption( Bytes.QUERYOPTION_SLAVEOK); } else { cur = coll.find(query).addOption(Bytes.QUERYOPTION_SLAVEOK); }

size = enable_limit ? cur.itcount() : cur.size();
System.out.println("count: get " + size);
}

Testing failover by issuing kill -9 on the primary node. Cannot seem to be able to catch exception s.t. I
can retry the query.

java.io.IOException: couldn't connect to [ip-10-166-59-166/10.166.59.166:20000] bc:java.net.ConnectException: Connection refused
at com.mongodb.DBPort._open(DBPort.java:205)
at com.mongodb.DBPort.go(DBPort.java:85)
at com.mongodb.DBPort.go(DBPort.java:66)
at com.mongodb.DBPort.call(DBPort.java:56)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:211)
at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:284)
at com.mongodb.DBCursor._check(DBCursor.java:297)
at com.mongodb.DBCursor._hasNext(DBCursor.java:420)
at com.mongodb.DBCursor.hasNext(DBCursor.java:445)
at com.mongodb.DBCursor.itcount(DBCursor.java:535)
at com.leadpoint.db.MongoDbQueryPerformanceTest.getCount(MongoDbQueryPerformanceTest.java:101)
at com.leadpoint.db.MongoDbQueryPerformanceTest.main(MongoDbQueryPerformanceTest.java:255)
Nov 4, 2010 4:03:26 PM com.mongodb.DBTCPConnector$MyPort error
SEVERE: MyPort.error called
java.io.IOException: couldn't connect to [ip-10-166-59-166/10.166.59.166:20000] bc:java.net.ConnectException: Connection refused
at com.mongodb.DBPort._open(DBPort.java:205)
at com.mongodb.DBPort.go(DBPort.java:85)
at com.mongodb.DBPort.go(DBPort.java:66)
at com.mongodb.DBPort.call(DBPort.java:56)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:211)
at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:284)
at com.mongodb.DBCursor._check(DBCursor.java:297)
at com.mongodb.DBCursor._hasNext(DBCursor.java:420)
at com.mongodb.DBCursor.hasNext(DBCursor.java:445)
at com.mongodb.DBCursor.itcount(DBCursor.java:535)