hi,

How to generate a unique row key for every event in flume- ng??
So that i can store data into cassandra.

Thank you

you can use time stamp along with nano seconds  which would give unique row key.

Madhu  Munagala
(214)679-2872

On Feb 13, 2013, at 10:35 PM, Sri Ramya <[EMAIL PROTECTED]> wrote:

> hi,
>
> How to generate a unique row key for every event in flume- ng??
> So that i can store data into cassandra.
>
> Thank you

Only on a single machine with a single cpu. Multiple machines could still generate the same value. Multiple threads on the same machine could generate the same value.

The uuid log4j 2 uses accounts for this. The Cassandra FAQ wiki page discusses using a uuid but the project it references is unfortunately not thread safe - at least the last I checked.

Ralph

On Feb 14, 2013, at 5:11 AM, Madhu Gmail <[EMAIL PROTECTED]> wrote:

> you can use time stamp along with nano seconds  which would give unique row key.
>
> Madhu  Munagala
> (214)679-2872
>
> On Feb 13, 2013, at 10:35 PM, Sri Ramya <[EMAIL PROTECTED]> wrote:
>
>> hi,
>>
>> How to generate a unique row key for every event in flume- ng??
>> So that i can store data into cassandra.
>>
>> Thank you

See https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk/flume-ng/src/main/java/org/apache/logging/log4j/flume/appender/FlumeEvent.java and then look at the addGuid method.

Ralph
On Feb 13, 2013, at 8:35 PM, Sri Ramya wrote:

> hi,
>
> How to generate a unique row key for every event in flume- ng??
> So that i can store data into cassandra.
>
> Thank you