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From Annu Agrawal <annu.agrawa...@gmail.com>
Subject Re: Problem in running code using thrift api and cassandra
Date Mon, 11 Mar 2013 07:42:58 GMT
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

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