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Flume >> mail # user >> Can we treat a whole file as a Flume event?


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Re: Can we treat a whole file as a Flume event?
https://github.com/apache/flume/blob/trunk/flume-ng-core/src/main/java/org/apache/flume/source/SpoolDirectorySource.java
On Tue, Jan 22, 2013 at 9:23 PM, Roshan Naik <[EMAIL PROTECTED]> wrote:

> Mike,
>    Where is the SpoolingFileSource that you are referring to  ?
>
> -roshan
>
>
> On Tue, Jan 22, 2013 at 6:39 PM, Mike Percy <[EMAIL PROTECTED]> wrote:
>
>> Hi Roshan,
>> Yep in general I'd have concerns w.r.t. capacity planning and garbage
>> collector behavior for large events. Flume holds at least one event batch
>> in memory at once, depending on # of sources/sinks, and even with a batch
>> size of 1 if you have unpredictably large events there is nothing
>> preventing an OutOfMemoryError in extreme cases. But if you plan for
>> capacity and test thoroughly then it can be made to work.
>>
>> Regards,
>> Mike
>>
>>
>> On Tue, Jan 22, 2013 at 3:38 PM, Roshan Naik <[EMAIL PROTECTED]>wrote:
>>
>>> i recall some discussion with regards to being cautious on the size of
>>> the events (in this case the file being moved) as flume is not quite
>>> intended for large events. Mike perhaps you can throw some light on that
>>> aspect ?
>>>
>>>
>>> On Tue, Jan 22, 2013 at 12:17 AM, Mike Percy <[EMAIL PROTECTED]> wrote:
>>>
>>>> Check out the latest changes to SpoolingFileSource w.r.t.
>>>> EventDeserializers on trunk. You can deserialize a whole file that way if
>>>> you want. Whether that is a good idea depends on your use case, though.
>>>>
>>>> It's on trunk, lacking user docs for the latest changes but I will try
>>>> to hammer out updated docs soon. In the meantime, you can just look at the
>>>> code and read the comments.
>>>>
>>>> Regards,
>>>> Mike
>>>>
>>>> On Monday, January 21, 2013, Nitin Pawar wrote:
>>>>
>>>>> you cant configure it to send the entire file in an event unless you
>>>>> have fixed number of events in each of the files. basically it reads the
>>>>> entire file into a channel and then starts writing.
>>>>>
>>>>> so as long as you can limit the events in the file, i think you can
>>>>> send entire file as a transaction but not as a single event
>>>>> as long as I understand flume treats individual lines in the file as
>>>>> event
>>>>>
>>>>> if you want to pull the entire file then you may want to implement
>>>>> that with messaging queues where you send an event to activemq queue and
>>>>> then your consumer may pull the file in one transaction with some other
>>>>> mechanism like ftp or scp or something like that
>>>>>
>>>>> others will have better idea, i am just suggesting a crude way to get
>>>>> the entire file as a single event
>>>>>
>>>>>
>>>>> On Tue, Jan 22, 2013 at 12:19 PM, Henry Ma <[EMAIL PROTECTED]>wrote:
>>>>>
>>>>>> As far as I know, Directory Spooling Source will send the file line
>>>>>> by line as an event, and File Roll Sink will receive these lines and roll
>>>>>> up to a big file by a fixed interval. Is it right, and can we config it to
>>>>>> send the whole file as an event?
>>>>>>
>>>>>>
>>>>>> On Tue, Jan 22, 2013 at 1:22 PM, Nitin Pawar <[EMAIL PROTECTED]
>>>>>> > wrote:
>>>>>>
>>>>>>> why don't you use directory spooling ?
>>>>>>>
>>>>>>>
>>>>>>> On Tue, Jan 22, 2013 at 7:15 AM, Henry Ma <[EMAIL PROTECTED]>wrote:
>>>>>>>
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> When using Flume to collect log files, we want to just COPY the
>>>>>>>> original files from several servers to a central storage (unix file
>>>>>>>> system), not to roll up to a big file. Because we must record some messages
>>>>>>>> of the original file such as name, host, path, timestamp, etc. Besides, we
>>>>>>>> want to guarantee total reliability: no file miss, no file reduplicated.
>>>>>>>>
>>>>>>>> It seems that, in Source, we must put a whole file (size may be
>>>>>>>> between 100KB and 100MB) into a Flume event; and in Sink, we must write
>>>>>>>> each event to a single file.
>>>>>>>>
>>>>>>>> Is it practicable? Thanks!
>>>>>>>>
>>>>>>>> --
>>>>>>>> Best Regards,
>>>>>>>> Henry Ma
>>>>>>>>
>>>>>>>