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From Brian O'Neill <b...@alumni.brown.edu>
Subject Re: logging servers? any interesting in one for cassandra?
Date Wed, 07 Nov 2012 14:11:06 GMT

Thanks Dean.  We'll definitely take a look.  (probably in January)

-brian

---
Brian O'Neill
Lead Architect, Software Development
Health Market Science
The Science of Better Results
2700 Horizon Drive • King of Prussia, PA • 19406
M: 215.588.6024 • @boneill42 <http://www.twitter.com/boneill42>  •
healthmarketscience.com

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On 11/6/12 11:19 AM, "Hiller, Dean" <Dean.Hiller@nrel.gov> wrote:

>Sure, in our playing around, we have an awesome log back configuration for
>development time only that shows warning, severe in red in eclipse and
>let's you click on every single log taking you right to the code that
>logged it…(thought you might enjoy it)...
>
>https://github.com/deanhiller/playorm/blob/master/input/javasrc/logback.xm
>l
>
>
>The java appender is here(called CassandraAppender)
>https://github.com/deanhiller/playorm/tree/master/input/javasrc/com/alvaza
>n
>/play/logging
>
>
>The AsyncAppender there is different then log backs in that it allows
>bursting but once reaches the limit, it essentially becomes synchronous
>again which allows us to not drop logs like log backs and allow for bursts
>of performance
>
>The CircularBufferAppender is an inmemory buffer that flushes all logs X
>level and above to child appender when a warning or severe happens where X
>is configurable.  
>
>We have only tested out the CassandraAppender at this point.  Right now
>you have to call CassandraAppender.setFactory to set the
>NoSqlEntityManager factory to set it.  It creates a LogEvent rows as well
>as an index on the session and partitions by the first two characters of
>the web session id so there is an index per partition.  This allows us to
>the look at a single web session of a user.  The only thing I don't like
>is we have to do a read when updating the index to be able to delete old
>values in the index(ick), but I couldn't figure any other way around that.
>
>Also, if you have high event rates, there is a MDCLevelFilter so you can
>tag the MDC with something like user=__program__ and ignore all logs for
>him unless they are warning logs which we use to limit the logs from just
>being huge.
>
>Later,
>Dean
>
>
>On 11/6/12 6:32 AM, "Brian O'Neill" <bone@alumni.brown.edu> wrote:
>
>>Nice DeanŠ
>>
>>I'm not so sure we would run the server, but we'd definitely be
>>interested
>>in the logback adaptor.
>>(We would then just access the data via Virgil (over REST), with a thin
>>javascript UI)
>>
>>Let me/us know if you end up putting it out there.  We intend centralize
>>logging sometime over the next few months.
>>
>>-brian
>>
>>---
>>Brian O'Neill
>>Lead Architect, Software Development
>>Health Market Science
>>The Science of Better Results
>>2700 Horizon Drive € King of Prussia, PA € 19406
>>M: 215.588.6024 € @boneill42 <http://www.twitter.com/boneill42>  €
>>healthmarketscience.com
>>
>>This information transmitted in this email message is for the intended
>>recipient only and may contain confidential and/or privileged material.
>>If
>>you received this email in error and are not the intended recipient, or
>>the person responsible to deliver it to the intended recipient, please
>>contact the sender at the email above and delete this email and any
>>attachments and destroy any copies thereof. Any review, retransmission,
>>dissemination, copying or other use of, or taking any action in reliance
>>upon, this information by persons or entities other than the intended
>>recipient is strictly prohibited.
>> 
>>
>>
>>
>>
>>
>>
>>On 11/1/12 10:33 AM, "Hiller, Dean" <Dean.Hiller@nrel.gov> wrote:
>>
>>>2 questions
>>>
>>> 1.  What are people using for logging servers for their web tier
>>>logging?
>>> 2.  Would anyone be interested in a new logging server(any programming
>>>language) for web tier to log to your existing cassandra(it uses up disk
>>>space in proportion to number of web servers and just has a rolling
>>>window of logs along with a window of threshold dumps)?
>>>
>>>Context for second question: I like less systems since it is less
>>>maintenance/operations cost and so yesterday I quickly wrote up some log
>>>back appenders which support (SLF4J/log4j/jdk/commons libraries) and
>>>send
>>>the logs from our client tier into cassandra.  It is simply a rolling
>>>window of logs so the space used in cassandra is proportional to the
>>>amount of web  servers I have(currently, I have 4 web servers).  I am
>>>also thinking about adding warning type logging such that on warning,
>>>the
>>>last N logs info and above are flushed along with the warning so
>>>basically two rolling windows.  Then in the GUI, it simply shows the
>>>logs
>>>and if you click on a session, it switches to a view with all the logs
>>>for that session(no matter which server since in our cluster the session
>>>switches servers on every request since we are statelessŠ.our session id
>>>is in the cookie).
>>>
>>>Well, let me know if anyone is interested and would actually use such a
>>>thing and if so, we might create a server around it.
>>>
>>>Thanks,
>>>Dean
>>
>>
>



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