You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@cassandra.apache.org by Sandeep <Sa...@indatus.com> on 2010/05/18 21:45:30 UTC

Help with UUID in C#.net

Hi all,

I am new to Cassandra. I am trying to insert some values to the columnfamily. The definition of columnfamily in the config file is as follows.

<ColumnFamily Name="CommandQueue"
                    ColumnType="Super"
                    CompareWith="TimeUUIDType"
                    CompareSubcolumnsWith="UTF8Type"/>


When ever I try to insert values to I always get   "InvalidRequestException(why: UUIDs must be exactly 16 bytes)".

I am using batch_mutate() to insert column.

How can I insert values to the column family.

Thanks,
Sandeep.

RE: Help with UUID in C#.net

Posted by Sandeep <Sa...@indatus.com>.
Batch Mutate can only take map<string, map<string, list<Mutation>>> as parameter but not a GUID.

How to solve this problem.

From: Sandeep [mailto:Sandeep@indatus.com]
Sent: Tuesday, May 18, 2010 4:03 PM
To: user@cassandra.apache.org
Subject: RE: Help with UUID in C#.net

Hi Roger,

Thanks for your reply.

Actually I copied the class(GUIDGenerator.) in my project.

Guid guidTimeStamp = GuidGenerator.GenerateTimeBasedGuid();

And using the above statement to generate the UUID. But I have no idea how to insert the UUID into Cassandra.

List<Column> listOfArrivalTimes = new List<Column>();
listOfArrivalTimes.Add(new Column() { Name = utf8Encoding.GetBytes("ArrivalTime"), Timestamp = DateTime.Now.Ticks, Value = utf8Encoding.GetBytes(commandQueueEntry.ArrivalTime.ToString()) });

Mutation ArrivalTime = new Mutation()
{
 Column_or_supercolumn = new ColumnOrSuperColumn() { Super_column = new SuperColumn() { Name = utf8Encoding.GetBytes("ArrivalTime"), Columns = listOfArrivalTimes } }
};

And then using batch_mutate() to insert the values.  I have no clue where and how should I use the generated UUID.

I can not use it in " Timestamp" in column struct  because it is of type long.  Please help me with this.

Thanks,
Sandeep.

From: Roger Schildmeijer [mailto:schildmeijer@gmail.com]
Sent: Tuesday, May 18, 2010 3:53 PM
To: user@cassandra.apache.org
Subject: Re: Help with UUID in C#.net

Nick Berardi's blog post about Cassandra in conjunction with c#/.net and TimeUUID describes how to do.

http://www.coderjournal.com/2010/04/creating-a-time-uuid-guid-in-net/

// Roger Schildmeijer

On 18 maj 2010, at 21.45em, Sandeep wrote:

Hi all,

I am new to Cassandra. I am trying to insert some values to the columnfamily. The definition of columnfamily in the config file is as follows.

<ColumnFamily Name="CommandQueue"
                    ColumnType="Super"
                    CompareWith="TimeUUIDType"
                    CompareSubcolumnsWith="UTF8Type"/>


When ever I try to insert values to I always get   "InvalidRequestException(why: UUIDs must be exactly 16 bytes)".

I am using batch_mutate() to insert column.

How can I insert values to the column family.

Thanks,
Sandeep.

RE: Help with UUID in C#.net

Posted by Sandeep <Sa...@indatus.com>.
Hi Roger,

Thanks for your reply.

Actually I copied the class(GUIDGenerator.) in my project.

Guid guidTimeStamp = GuidGenerator.GenerateTimeBasedGuid();

And using the above statement to generate the UUID. But I have no idea how to insert the UUID into Cassandra.

List<Column> listOfArrivalTimes = new List<Column>();
listOfArrivalTimes.Add(new Column() { Name = utf8Encoding.GetBytes("ArrivalTime"), Timestamp = DateTime.Now.Ticks, Value = utf8Encoding.GetBytes(commandQueueEntry.ArrivalTime.ToString()) });

Mutation ArrivalTime = new Mutation()
{
 Column_or_supercolumn = new ColumnOrSuperColumn() { Super_column = new SuperColumn() { Name = utf8Encoding.GetBytes("ArrivalTime"), Columns = listOfArrivalTimes } }
};

And then using batch_mutate() to insert the values.  I have no clue where and how should I use the generated UUID.

I can not use it in " Timestamp" in column struct  because it is of type long.  Please help me with this.

Thanks,
Sandeep.

From: Roger Schildmeijer [mailto:schildmeijer@gmail.com]
Sent: Tuesday, May 18, 2010 3:53 PM
To: user@cassandra.apache.org
Subject: Re: Help with UUID in C#.net

Nick Berardi's blog post about Cassandra in conjunction with c#/.net and TimeUUID describes how to do.

http://www.coderjournal.com/2010/04/creating-a-time-uuid-guid-in-net/

// Roger Schildmeijer

On 18 maj 2010, at 21.45em, Sandeep wrote:


Hi all,

I am new to Cassandra. I am trying to insert some values to the columnfamily. The definition of columnfamily in the config file is as follows.

<ColumnFamily Name="CommandQueue"
                    ColumnType="Super"
                    CompareWith="TimeUUIDType"
                    CompareSubcolumnsWith="UTF8Type"/>


When ever I try to insert values to I always get   "InvalidRequestException(why: UUIDs must be exactly 16 bytes)".

I am using batch_mutate() to insert column.

How can I insert values to the column family.

Thanks,
Sandeep.

Re: Help with UUID in C#.net

Posted by Roger Schildmeijer <sc...@gmail.com>.
Nick Berardi's blog post about Cassandra in conjunction with c#/.net and TimeUUID describes how to do.  

http://www.coderjournal.com/2010/04/creating-a-time-uuid-guid-in-net/

// Roger Schildmeijer

On 18 maj 2010, at 21.45em, Sandeep wrote:

> Hi all,
>  
> I am new to Cassandra. I am trying to insert some values to the columnfamily. The definition of columnfamily in the config file is as follows.
>  
> <ColumnFamily Name="CommandQueue"
>                     ColumnType="Super"
>                     CompareWith="TimeUUIDType"
>                     CompareSubcolumnsWith="UTF8Type"/>
>  
>  
> When ever I try to insert values to I always get   "InvalidRequestException(why: UUIDs must be exactly 16 bytes)".
>  
> I am using batch_mutate() to insert column.
>  
> How can I insert values to the column family.
>  
> Thanks,
> Sandeep.