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From alex kamil <alex.ka...@gmail.com>
Subject Re: resultSet.next() is slow
Date Tue, 11 Mar 2014 19:57:52 GMT
running the query on a table with 3 salt buckets (previously 128) brought
down the time to single digits sec, what could be the possible explanation?


On Tue, Mar 11, 2014 at 3:30 PM, alex kamil <alex.kamil@gmail.com> wrote:

> running the below query in sqlline takes less than 4 sec  but when calling
> from Java client the first resultSet.next() is much slower (>20 sec), any
> ideas?
>
>
> client code
>
> String JDBC_DRIVER = "jdbc:phoenix:myip";
>
>  String query = "SELECT ROWKEY FROM mytable LIMIT 10000";
>
> //ROWKEY size=32bytes, mytable size=4M rows (128 regions on 3 servers
> with 40GB heap)
>
>  Class.forName("com.salesforce.phoenix.jdbc.PhoenixDriver");
>
> DriverManager.getConnection(JDBC_DRIVER);
>
>    Connection con = DriverManager.getConnection(JDBC_DRIVER);
>
>  Statement stmt  = con.createStatement();
>
>  ResultSet resultSet =stmt.executeQuery(query);
>
>  Object o = null; int i=0;boolean isFirst = true;
>
>  long start = System.currentTimeMillis();
>
> * while(resultSet.next())*{
>
>   if (isFirst){
>
>   System.out.println("*Time taken for first getNext() *: " +
> (System.currentTimeMillis() - start));
>
>   isFirst = false;
>
>   }
>
>   for (i = 0; i < colmax; ++i)
>
>   {
>
>   o = resultSet.getObject(i + 1);
>
>   if (o != null){
>
>    //rowKeys.add(o.toString());
>
>   }
>
>   }
>
>  }
>
>     System.out.println("Time taken to  loop through : " +
> (System.currentTimeMillis() - start));
>
>
>
>

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