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From Tsuyoshi OZAWA <ozawa.tsuyo...@gmail.com>
Subject Re: [DISCUSS] Switch to log4j 2
Date Fri, 15 Aug 2014 02:34:02 GMT

Steve has started discussion titled "use SLF4J APIs in new modules?"
as a related topic.

It sounds good to me to use asynchronous logging when we log INFO. One
concern is that asynchronous logging makes debugging difficult - I
don't know log4j 2 well, but I suspect that ordering of logging can be
changed even if WARN or  FATAL are logged with synchronous logger.

- Tsuyoshi

On Thu, Aug 14, 2014 at 6:44 AM, Arpit Agarwal <aagarwal@hortonworks.com> wrote:
> I don't recall whether this was discussed before.
> I often find our INFO logging to be too sparse for useful diagnosis. A high
> performance logging framework will encourage us to log more. Specifically,
> Asynchronous Loggers look interesting.
> https://logging.apache.org/log4j/2.x/manual/async.html#Performance
> What does the community think of switching to log4j 2 in a Hadoop 2.x
> release?
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