Protocol Error

[Vivekananda Nayak]

Dear All,

I am getting Protocol Error [run time error ] when i am executing below code.

-----------------------------------------------------------------------

rc = executeStatement(
string("INSERT INTO simplex.songs (id, title, album, artist, tags) ") +
"VALUES (" +
"756716f7-2e54-4715-9f00-91dcbea6cf50," +
"'La Petite Tonkinoise'," +
"'Bye Bye Blackbird'," +
"'Joséphine Baker'," +
"{'jazz', '2013'})" +
";");

-----------------------------------------------------------------------

any pointers here....? what exactly the problem...?

i have attached visual studio project in zip file.

Thanks and Regards
Vivek

[Michael Penick]

Hi,

What version of cpp-driver and Cassandra?

Mike

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[Michael Fero]

Vivek,

The error returned in your example is CASS_ERROR_SERVER_PROTOCOL_ERROR; however the actual error returned by the server is 'Cannot decode string as UTF8' due to the improperly encoded std::string (e.g. the é in Joséphine Baker). To get the detailed error you should use the future and `cass_future_error_message` whenever the error code is not CASS_OK.

Before your simple statements are executed you will need to make sure that the cstring is properly encoded when using the extended ASCII set in your statements. C++11 (which is not available in Visual Studio 2010) offers a simple enoding for string literals.

~Fero

[Vivekananda Nayak]

Hi , I am using :Cassandra v3.7.0 ,cpp-driver-389_build_fixes

Regards
Vivek

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[Vivekananda Nayak]

Dear Fero,

Thank you. Removed special characters ...now working but i have another strange issues, getting some junk data when i am trying to print accessed data..? any issues here..?. attached snapshot...

[Michael Fero]

Vivek,

You are not printing out your results correctly; the strings returned from `cass_value_get_string` are not null terminated which is why the length is provided. Since you are using C++ functionality, convert the value with length to a std::string before printing.

~Fero

[Vivekananda Nayak]

Dear Fero,

Thank you. just wanted to know few things

1. how can I connect to Casandra  DB from Web Page..? do i need any web server..?.

2. If web server required Can i use Tomcat..? what additional drivers required..? is any simple examples are available..? please do let me know

Regards

Vivek

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[Michael Fero]

Vivek,

Glad to help.

In order to interface your external C++ application to a web server you will need to determine your requirements and choose the web server that is applicable to those requirements; see FastCGI wiki to get yourself started (https://en.wikipedia.org/wiki/FastCGI). As far as examples, you can utilize the resources in the C/C++ driver repository (https://github.com/datastax/cpp-driver/tree/master/examples) and the DataStax Academy (https://academy.datastax.com) to portal to help further your knowledge and experience with Cassandra.

~Fero

[Vivekananda Nayak]

Dear Fero,

Thank you.

I am getting some error when i am trying to connect to Casandra DB. tried to figure out from command prompt, i got below log 

---------------------------------------------------------------------------------------------------------------------

C:\Program Files\DataStax-DDC\apache-cassandra\bin>net start DataStax_DDC_Server

The DataStax DDC Server 3.7.0 service is starting.

The DataStax DDC Server 3.7.0 service was started successfully.

C:\Program Files\DataStax-DDC\apache-cassandra\bin>nodetool status

nodetool: Failed to connect to '127.0.0.1:7199' - ConnectException: 'Connection

refused: connect'.

C:\Program Files\DataStax-DDC\apache-cassandra\bin>net stop DataStax_DDC_Server

The DataStax DDC Server 3.7.0 service is not started.

More help is available by typing NET HELPMSG 3521.

---------------------------------------------------------------------------------------------------------------------------------------------

is  any work around to this issue..?

Regards

Vivek

~Fero

[Michael Fero]

Vivek,

It sounds like you do not have JMX enabled. You will want to modify the cassandra.bat file and restart the Cassandra instance; see https://github.com/apache/cassandra/blob/cassandra-3.7/bin/cassandra.bat#L71-L75. You may also need to add -Djava.rmi.server.hostname=127.0.0.1.

~Fero

[Vivekananda Nayak]

Dear Fero,

Thank you for your update.

I have checked your hints and changes are part of the Casandra now. even after changes still i have same issue.

attached log for your reference. Can you pls check once

Regards

Vivek

~Fero

[Michael Fero]

Vivek,

From the looks of things you are running through PowerShell (which is good), so the changes to the cassandra.bat file are not necessary and you will need to edit cassandra-env.ps1 (which it looks like you have already done so).

The steps I am providing below will allow you to use nodetool locally, but this is also unsecure due to the disabling of the security; please read up on JMX security measures and consult the documentation for enabling JMX https://docs.datastax.com/en/cassandra_win/3.x/cassandra/configuration/secureJmxAuthentication.html.

1. Uncomment https://github.com/apache/cassandra/blob/cassandra-3.7/conf/cassandra-env.ps1#L448
2. Uncomment https://github.com/apache/cassandra/blob/cassandra-3.7/conf/cassandra-env.ps1#L452 and change the value to false
3. Uncomment https://github.com/apache/cassandra/blob/cassandra-3.7/conf/cassandra-env.ps1#L463 and change the value to false
4. Restart your Cassandra instance

With these steps completed you should now be able to run commands like `nodetool status` and `nodetool ring` on the same machine the Cassandra instance is running. If you have further issues with Apache Cassandra please direct your questions to the Apache Cassandra mailing list http://www.mail-archive.com/us...@cassandra.apache.org/info.html and utilize this forum for C/C++ driver related questions.

Thank you.

~Fero

[Vivekananda Nayak]

Dear Fero,

Thanks for your inputs. I will take a note of your input.

Regards

VIvek

~Fero