Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
Flume, mail # user - Unable to deliver event. Exception follows. java.lang.NullPointerException


Copy link to this message
-
Re: Unable to deliver event. Exception follows. java.lang.NullPointerException
George Pang 2013-10-31, 05:06
Thank you Ashish, this looks pretty straightforward and I will try it.

George
On Wed, Oct 30, 2013 at 6:53 PM, Ashish <[EMAIL PROTECTED]> wrote:

> George,
>
> Just to get things working, you can use UUID Interceptor
> http://flume.apache.org/FlumeUserGuide.html#uuid-interceptor
>
> Put the headerName field value as rowKey and the code should work. I have
> not used this, but if it still doesn't work let us know. I will quickly
> hack out a working example.
>
>
> On Thu, Oct 31, 2013 at 1:22 AM, George Pang <[EMAIL PROTECTED]> wrote:
>
>> Thank you, but I am not so sure I can insert header with the example in
>> this blog. I miss a part for the whole picture.
>>
>> George
>>
>>
>> On Wed, Oct 30, 2013 at 6:56 AM, Brock Noland <[EMAIL PROTECTED]> wrote:
>>
>>> I just googled and found this. Not sure if there is a better one.
>>>
>>>
>>> http://blog.cloudera.com/blog/2013/07/morphlines-the-easy-way-to-build-and-integrate-etl-apps-for-apache-hadoop/
>>>
>>>
>>> On Wed, Oct 30, 2013 at 12:34 AM, George Pang <[EMAIL PROTECTED]> wrote:
>>>
>>>> Is there a tutorial for this topic out there?
>>>>
>>>> Thanks,
>>>>
>>>> George
>>>>
>>>>
>>>> On Tue, Oct 29, 2013 at 6:50 PM, George Pang <[EMAIL PROTECTED]> wrote:
>>>>
>>>>> Hi Brock,
>>>>>
>>>>> The morphline comand addValue looks like the one I need, but how can I
>>>>> add the event head key-value pair?
>>>>>
>>>>> Thank you,
>>>>>
>>>>> George
>>>>>
>>>>>
>>>>> On Tue, Oct 29, 2013 at 1:02 PM, George Pang <[EMAIL PROTECTED]> wrote:
>>>>>
>>>>>> Hi Brock,
>>>>>>
>>>>>> Yes, I think morphline interceptor should be something I am looking
>>>>>> for. I am studying it now.
>>>>>>
>>>>>> Thank you,
>>>>>>
>>>>>> George
>>>>>>
>>>>>>
>>>>>> On Tue, Oct 29, 2013 at 12:56 PM, Brock Noland <[EMAIL PROTECTED]>wrote:
>>>>>>
>>>>>>> In a very simple demo you could use the static interceptor:
>>>>>>> http://flume.apache.org/FlumeUserGuide.html#static-interceptor
>>>>>>>
>>>>>>> but you probably want to use morphlines interceptor a custom
>>>>>>> interceptor:
>>>>>>> http://flume.apache.org/FlumeUserGuide.html#morphline-interceptor
>>>>>>>
>>>>>>>
>>>>>>> On Tue, Oct 29, 2013 at 2:52 PM, Hari Shreedharan <
>>>>>>> [EMAIL PROTECTED]> wrote:
>>>>>>>
>>>>>>>> Nope. You need to insert it at some other location.
>>>>>>>>
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Hari
>>>>>>>>
>>>>>>>> On Tuesday, October 29, 2013 at 12:48 PM, George Pang wrote:
>>>>>>>>
>>>>>>>> Hi Hari,
>>>>>>>>
>>>>>>>> Is it (inserting a rowKey header into event) something I can do in
>>>>>>>> flume.conf? I tried to do that but I am new to flume.
>>>>>>>>
>>>>>>>> Thank you,
>>>>>>>>
>>>>>>>> George
>>>>>>>>
>>>>>>>>
>>>>>>>> On Tue, Oct 29, 2013 at 12:40 PM, Hari Shreedharan <
>>>>>>>> [EMAIL PROTECTED]> wrote:
>>>>>>>>
>>>>>>>>  Did you insert a rowKey header into the event? If the header is
>>>>>>>> not there, you are obviously going to get null returned from
>>>>>>>> currentEvent.getHeaders().get(“rowKey”). You need to insder the header into
>>>>>>>> the event at some point.
>>>>>>>>
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Hari
>>>>>>>>
>>>>>>>> On Tuesday, October 29, 2013 at 12:30 PM, George Pang wrote:
>>>>>>>>
>>>>>>>> Hi Ashish,
>>>>>>>>
>>>>>>>> Actually it starts with headers. In the example code has "  String
>>>>>>>> rowKeyStr = currentEvent.getHeaders().get("rowKey");" but there is no such
>>>>>>>> header found. If I get rid of this line, the rest will complain unable to
>>>>>>>> deliver event. But I checked the event, it's not null.
>>>>>>>>
>>>>>>>> I am trying to use flume to save to hbase, and use the example
>>>>>>>> http://blog.cloudera.com/blog/2012/11/streaming-data-into-apache-hbase-using-apache-flume/for customized serializer.
>>>>>>>>
>>>>>>>> flume.conf:
>>>>>>>>
>>>>>>>> logger-agent.sources = Syslog-UDP
>>>>>>>> logger-agent.sinks = Syslog-HBase
>>>>>>>> logger-agent.channels = Syslog-HBase-Channel
>>>>>>>>
>>>>>>>> logger-agent.sources.Syslog-UDP.channels = Syslog-HBase-Channel
>>>>>>>> logger-agent.sinks.Syslog-HBase.channel = Syslog-HBase-Channel