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From ruslan usifov <ruslan.usi...@gmail.com>
Subject Slow network writes
Date Wed, 02 Feb 2011 17:43:40 GMT
Hello

I try make little cluster of 2 cassandra (0.7.0) nodes and I make little
test in php:


<?php
define("LIBPATH", "lib/");
define("RECORDSSETCOUNT", 100);

require_once("thrift/Thrift.php");
require_once("thrift/transport/TSocket.php");
require_once("thrift/transport/TFramedTransport.php");
require_once("thrift/protocol/TBinaryProtocol.php");

require_once(LIBPATH."cassandra/Cassandra.php");
require_once(LIBPATH."cassandra/cassandra_types.php");

//-----------------------------------------------------------------------------
$transport = new TFramedTransport(new TSocket("10.24.84.4", 9160));
$protocol  = new TBinaryProtocolAccelerated($transport);

$client = new CassandraClient($protocol);
$transport->open();

$client->set_keyspace("test");

//-----------------------------------------------------------------------------
$l_row = array("qw" => "12", "as" => "67", "df" => "df", "id" => "uid",
"uid" => "1212");
$l_begin = microtime(true);

for($i=0; $i < 1000000; ++$i)
{
    $l_columns = array();

    foreach($l_row as $l_key => $l_value)
    {
        $l_columns[] = new cassandra_Column(array("name" => $l_key, "value"
=> $l_value, "timestamp" => time()));
    };

    $l_supercolumn = new cassandra_SuperColumn(array("name" => $l_row["id"],
"columns" => $l_columns));
    $l_c_or_sc = new cassandra_ColumnOrSuperColumn(array("super_column" =>
$l_supercolumn));
    $l_mutation = new cassandra_Mutation(array("column_or_supercolumn" =>
$l_c_or_sc));

    $client->batch_mutate(array($l_row["uid"] => array('adsdfsdfsd' =>
array($l_mutation))), cassandra_ConsistencyLevel::ONE);

    if($i && !($i % 1000))
    {
       print (microtime(true) - $l_begin)."\n";
       $l_begin = microtime(true);
    };
};

print "done\n";
sleep(20);
?>



When i run this test on the same machine  that run cassandra daemon with
ip(10.24.84.4) i got foolow results:

0.64255094528198
0.53704404830933
0.4430079460144
0.43299198150635


But when i switch test on the other cassandra daemon with ip(10.24.84.7), so
test and cassandra daemon work on separates machines i got follow results:
2.4974539279938
2.3667190074921
2.2672221660614
2.3015670776367
2.2397489547729

So in my case performance degrade up to 5 times. Why this happens, and how
can i solve this? Latency of my network is good, ping give:

PING 10.24.84.7 (10.24.84.7) 56(84) bytes of data.
64 bytes from 10.24.84.7: icmp_seq=1 ttl=64 time=0.758 ms
64 bytes from 10.24.84.7: icmp_seq=2 ttl=64 time=0.696 ms
64 bytes from 10.24.84.7: icmp_seq=3 ttl=64 time=0.687 ms
64 bytes from 10.24.84.7: icmp_seq=4 ttl=64 time=0.735 ms
64 bytes from 10.24.84.7: icmp_seq=5 ttl=64 time=0.689 ms
64 bytes from 10.24.84.7: icmp_seq=6 ttl=64 time=0.631 ms
^V64 bytes from 10.24.84.7: icmp_seq=7 ttl=64 time=0.379 ms

PS: my system is Linux 2.6.32-311-ec2 #23-Ubuntu SMP Thu Dec 2 11:14:35 UTC
2010 x86_64 GNU/Linux

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