[prev in list] [next in list] [prev in thread] [next in thread]
List: cassandra-dev
Subject: Re: Problem in running code using thrift api and cassandra
From: Annu Agrawal <annu.agrawal29 () gmail ! com>
Date: 2013-03-11 7:54:58
Message-ID: CA+5Vq7pGxOf9ePz3H8xdhLORj_3GQm=kivvkVZCUQiHrFbRsSA () mail ! gmail ! com
[Download RAW message or body]
Yes Pushkar.. even i thought so. But if it was a problem then it would not
have been executed while debugging also if i am not wrong.. and moreover
when i exclude cassandra and keep the same logic it works..
On Sun, Mar 10, 2013 at 7:22 PM, Pushkar Prasad <
pushkar.prasad@airtightnetworks.net> wrote:
> Sounds like you are hitting a 16 bit limit someplace.
>
> -----Original Message-----
> From: Annu Agrawal [mailto:annu.agrawal29@gmail.com]
> Sent: 10 March 2013 19:00
> To: dev@cassandra.apache.org
> Subject: Problem in running code using thrift api and cassandra
>
> Hi ,
>
> The following program has a loop which reads a value from cassandra column
> which is stored in the form of string. In every iteration of the loop it
> reads that value converts it in unsigned long and adds 4096 in it . Then
> again it inserts this value in cassandra.
>
> The loop stops incrementing after some iterations. I have tried the same
> program without inserting in cassandra and it works totally fine.
>
> But the following program works fine till 'size' variable reaches 61440.
> After this iteration i.e 61440+4096=65536 the value read from cassandra
> continues to be 61440 only untill the loop ends. So this value is not
> getting inserted in cassandra.
>
> This program works absolutely fine when debugged. So I am not able to find
> where is exactly the problem.
> I am deadly stuck up here.. Is there any problem with jvm heap space or
> should any changes be made in cassandra.yaml file. Please help..
>
>
> #include "../gen-cpp/Cassandra.h"
> #include <iostream>
> #include <thrift/protocol/TBinaryProtocol.h>
> #include <thrift/transport/TSocket.h>
> #include <thrift/transport/TTransportUtils.h>
> #include <stdio.h>
> #include <unistd.h>
> #include <sys/time.h>
> #include <stdlib.h>
> #include "base64.h"
>
> using namespace std;
> using namespace apache::thrift;
> using namespace apache::thrift::protocol;
> using namespace apache::thrift::transport;
> using namespace org::apache::cassandra;
> using namespace boost;
>
> static string host("127.0.0.1");
> static int port= 9160;
>
> //generate timestamp
> int64_t getTS()
> {
> time_t ltime;
> ltime=time(NULL);
> return (int64_t)ltime;
> }
>
> int main()
> {
> shared_ptr <TTransport> socket(new TSocket(host, port));
> shared_ptr <TTransport> transport(new TFramedTransport(socket));
> shared_ptr <TProtocol> protocol(new TBinaryProtocol(transport));
>
> string base64,metadata;
> unsigned long size=0, *sizep;
> int ch;
> sizep=&size;
>
> CassandraClient client(protocol);
> ColumnPath cpath;
> ColumnParent cp;
> ColumnOrSuperColumn csc;
> Column c1;
>
> cp.column_family.assign("mycolfamily");
> cp.super_column.assign("");
>
> cpath.column_family.assign("mycolfamily");
> cpath.__set_column("data");
>
> transport->open();
> client.set_keyspace("mykeyspace");
>
> base64= base64_encode(UCCP(sizep),sizeof(*sizep));//converts
> unsigned long to ASCII string
>
> c1.__set_name("data");
> c1.__set_value(base64);
> c1.__set_timestamp(getTS());
> client.insert("mykey", cp, c1,
> org::apache::cassandra::ConsistencyLevel::ONE);
>
> for(ch=0;ch<30;ch++)
> {
> //reading from cassandra
> client.get(csc, "mykey", cpath,
> org::apache::cassandra::ConsistencyLevel::ONE);
>
> metadata = base64_decode(csc.column.value); //converts string
> to unsigned long
> memcpy(sizep,metadata.data(),metadata.size());
> sizep = (unsigned long *)sizep;
> cout<<"....\n Read value : "<< *sizep ;
>
> // incrementing size
> *sizep = *sizep + 4096;
>
> //writing size in cassandra
> base64= base64_encode(UCCP(sizep),sizeof(*sizep));//converts
> unsigned long to ASCII string
> c1.__set_name("data");
> c1.__set_value(base64);
> c1.__set_timestamp(getTS());
> client.insert("mykey", cp, c1,
> org::apache::cassandra::ConsistencyLevel::ONE);
>
> cout<<"\n Written value : "<< *sizep <<"\n\n";
> }
> transport->close();
> return 0;
> }
>
>
>
> --
> Thanks,
> Annu Agrawal
>
>
>
--
Thanks,
Annu Agrawal
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic